Atmospheric Research最新文献_第8页

Investigation of the meteorological conditions, dynamical, and microphysical characteristics of convective precipitation over the rainfall center of South China in the Pre-summer Rainy Season

IF 4.5 2区地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES

Atmospheric Research

Pub Date : 2024-11-23 DOI: 10.1016/j.atmosres.2024.107823

Haoyang Wei , Min Wen , Zheng Ruan , Haoran Li , Xiaohui Shi , Ziheng Huang

This study investigates the meteorological conditions, dynamics, and microphysical characteristics of convective precipitation in Longmen, South China, during the Pre-summer Rainy Season (PRS) from 2016 to 2020, focusing on the influence of the South China Sea summer monsoon (SCSSM) onset. Utilizing the ERA5 reanalysis dataset and observations from the C-band Vertical Pointing Radar (VPRC) and Two-Dimensional Video Disdrometer (2DVD), we analyzed 4560 Convective Precipitation Features (CPFs) and classified them into shallow convection (SC), middle convection (MC), and deep convection (DC) based on the maximum height of 35 dBZ echo-top. Key findings reveal that the onset of the SCSSM significantly enhances convective rainfall. Specifically, it increases the proportion of convective rainfall by 11 % and intensifies rainfall duration and intensity by approximately 2.2 times. Enhanced moisture convergence and stronger convective instability drive these changes. The microphysical processes are distinct across different CPF types. SCs display warm-rain processes, MCs indicate mixed-phase processes, and DCs are associated with ice-phase processes. Each type contributes uniquely to precipitation characteristics, vertical reflectivity profiles, and raindrop size distributions. These insights emphasize the SCSSM's critical role in regional precipitation patterns and provide valuable insights into the underlying processes affecting convective systems in South China, ultimately contributing to improving the capabilities of prediction in atmospheric research.

{"title":"Investigation of the meteorological conditions, dynamical, and microphysical characteristics of convective precipitation over the rainfall center of South China in the Pre-summer Rainy Season","authors":"Haoyang Wei , Min Wen , Zheng Ruan , Haoran Li , Xiaohui Shi , Ziheng Huang","doi":"10.1016/j.atmosres.2024.107823","DOIUrl":"10.1016/j.atmosres.2024.107823","url":null,"abstract":"<div><div>This study investigates the meteorological conditions, dynamics, and microphysical characteristics of convective precipitation in Longmen, South China, during the Pre-summer Rainy Season (PRS) from 2016 to 2020, focusing on the influence of the South China Sea summer monsoon (SCSSM) onset. Utilizing the ERA5 reanalysis dataset and observations from the C-band Vertical Pointing Radar (VPR<img>C) and Two-Dimensional Video Disdrometer (2DVD), we analyzed 4560 Convective Precipitation Features (CPFs) and classified them into shallow convection (SC), middle convection (MC), and deep convection (DC) based on the maximum height of 35 dBZ echo-top. Key findings reveal that the onset of the SCSSM significantly enhances convective rainfall. Specifically, it increases the proportion of convective rainfall by 11 % and intensifies rainfall duration and intensity by approximately 2.2 times. Enhanced moisture convergence and stronger convective instability drive these changes. The microphysical processes are distinct across different CPF types. SCs display warm-rain processes, MCs indicate mixed-phase processes, and DCs are associated with ice-phase processes. Each type contributes uniquely to precipitation characteristics, vertical reflectivity profiles, and raindrop size distributions. These insights emphasize the SCSSM's critical role in regional precipitation patterns and provide valuable insights into the underlying processes affecting convective systems in South China, ultimately contributing to improving the capabilities of prediction in atmospheric research.</div></div>","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"314 ","pages":"Article 107823"},"PeriodicalIF":4.5,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142757011","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Towards an understanding of uncertainties in the Lagrangian analysis of moisture sources for tropical cyclone precipitation through a study case 通过研究案例了解热带气旋降水水汽源拉格朗日分析的不确定性

IF 4.5 2区地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES

Atmospheric Research

Pub Date : 2024-11-23 DOI: 10.1016/j.atmosres.2024.107822

Albenis Pérez-Alarcón , Marta Vázquez , Ricardo M. Trigo , Raquel Nieto , Luis Gimeno

Despite the increasing number of atmospheric moisture tracking tools, their validation is challenging due to the lack of observations. This work contributes to a better understanding of uncertainties in the moisture sources analysis for the precipitation of tropical cyclones (TCs) by assessing eight combinations of threshold values in tracking methods based on the Lagrangian water budget equation. We selected as a study case Hurricane Ida that formed in the North Atlantic basin in late August 2021 and extracted the air parcel trajectories from the global outputs of the Lagrangian FLEXPART model. Results indicate that the choice of relative humidity (RH) threshold for filtering precipitating parcels has a noticeable impact on the Lagrangian precipitation estimates. In addition, methods applying the atmospheric boundary layer restriction produce a weaker moisture source pattern than those accounting for moisture uptakes in the whole atmospheric column. In particular, methods imposing an RH restriction along the air parcel trajectories to filter out noise in moisture losses outperform the others, providing more reliable moisture source contributions. We also introduced a simple bias correction approach that further improves the reliability of moisture source representation.

尽管大气水汽跟踪工具的数量在不断增加，但由于缺乏观测资料，对这些工具的验证仍具有挑战性。这项工作通过评估基于拉格朗日水预算方程的跟踪方法中的八个阈值组合，有助于更好地理解热带气旋降水的水汽源分析中的不确定性。我们选择了 2021 年 8 月底在北大西洋海盆形成的飓风艾达作为研究案例，并从拉格朗日 FLEXPART 模式的全球输出中提取了空气包裹轨迹。结果表明，过滤降水包裹的相对湿度（RH）阈值的选择对拉格朗日降水量估计值有明显影响。此外，应用大气边界层限制的方法产生的水汽源模式要弱于考虑整个大气柱水汽吸收的方法。特别是，沿空气包裹轨迹施加相对湿度限制以过滤水汽损失噪声的方法优于其他方法，提供了更可靠的水汽源贡献。我们还引入了一种简单的偏差校正方法，进一步提高了水汽源表示的可靠性。

{"title":"Towards an understanding of uncertainties in the Lagrangian analysis of moisture sources for tropical cyclone precipitation through a study case","authors":"Albenis Pérez-Alarcón , Marta Vázquez , Ricardo M. Trigo , Raquel Nieto , Luis Gimeno","doi":"10.1016/j.atmosres.2024.107822","DOIUrl":"10.1016/j.atmosres.2024.107822","url":null,"abstract":"<div><div>Despite the increasing number of atmospheric moisture tracking tools, their validation is challenging due to the lack of observations. This work contributes to a better understanding of uncertainties in the moisture sources analysis for the precipitation of tropical cyclones (TCs) by assessing eight combinations of threshold values in tracking methods based on the Lagrangian water budget equation. We selected as a study case Hurricane Ida that formed in the North Atlantic basin in late August 2021 and extracted the air parcel trajectories from the global outputs of the Lagrangian FLEXPART model. Results indicate that the choice of relative humidity (RH) threshold for filtering precipitating parcels has a noticeable impact on the Lagrangian precipitation estimates. In addition, methods applying the atmospheric boundary layer restriction produce a weaker moisture source pattern than those accounting for moisture uptakes in the whole atmospheric column. In particular, methods imposing an RH restriction along the air parcel trajectories to filter out noise in moisture losses outperform the others, providing more reliable moisture source contributions. We also introduced a simple bias correction approach that further improves the reliability of moisture source representation.</div></div>","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"314 ","pages":"Article 107822"},"PeriodicalIF":4.5,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142723847","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Regional differences in the effects of atmospheric moisture residence time on precipitation isotopes over Eurasia 大气水汽停留时间对欧亚大陆降水同位素影响的区域差异

IF 4.5 2区地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES

Atmospheric Research

Pub Date : 2024-11-22 DOI: 10.1016/j.atmosres.2024.107813

Qinqin Wang , Yuwei Liu , Guofeng Zhu , Siyu Lu , Longhu Chen , Yinying Jiao , Wenmin Li , Wentong Li , Yuhao Wang

Regional variations in atmospheric moisture residence time (RT) highlight the need to obtain independent observation indexes to constrain different model-based estimates. Stable isotopes of oxygen and hydrogen naturally exist in water molecules that can provide such observational constraints. We analyzed the relationship between RT and precipitation isotopes (δ²H and δ¹⁸O) across different climatic zones in Eurasia from 1980 to 2020. Our analysis reveals that: (1) Both precipitation isotopes and RT showed significant increasing trends during 1980–2020. The increase in RT corresponds to weakened net isotopic distillation over Eurasia, suggesting reduced atmospheric circulation intensity under warming conditions. (2) The spatial patterns of RT and precipitation isotopes vary significantly among different moisture source regions, reflecting distinct moisture transport and precipitation formation processes. (3) On long-term scales, RT generally shows positive correlations with precipitation isotopes, except in plateau regions. The RT-δ¹⁸O relationship exhibits latitude-dependent variations, with similar slopes in regions sharing common moisture sources. These findings enhance our understanding of the long-term controls on precipitation isotopic composition and atmospheric moisture cycling patterns across Eurasia.

大气湿气停留时间（RT）的区域性变化突出表明，需要获得独立的观测指标来制约不同的基于模式的估算。水分子中天然存在的氧和氢的稳定同位素可以提供这种观测约束。我们分析了 1980 年至 2020 年欧亚大陆不同气候带 RT 与降水同位素（δ2H 和 δ18O）之间的关系。我们的分析表明(1) 1980-2020 年间，降水同位素和 RT 均呈显著上升趋势。RT的增加与欧亚大陆上空净同位素蒸馏的减弱相对应，表明在气候变暖条件下大气环流强度减弱。(2）RT 和降水同位素的空间模式在不同水汽源区之间存在显著差异，反映了不同的水汽输送和降水形成过程。(3）在长期尺度上，除高原地区外，RT 一般与降水同位素呈正相关。RT 与δ18O 的关系呈现出纬度依赖性变化，在具有共同水汽来源的地区，两者的斜率相似。这些发现加深了我们对整个欧亚大陆降水同位素组成和大气水汽循环模式的长期控制的理解。

{"title":"Regional differences in the effects of atmospheric moisture residence time on precipitation isotopes over Eurasia","authors":"Qinqin Wang , Yuwei Liu , Guofeng Zhu , Siyu Lu , Longhu Chen , Yinying Jiao , Wenmin Li , Wentong Li , Yuhao Wang","doi":"10.1016/j.atmosres.2024.107813","DOIUrl":"10.1016/j.atmosres.2024.107813","url":null,"abstract":"<div><div>Regional variations in atmospheric moisture residence time (RT) highlight the need to obtain independent observation indexes to constrain different model-based estimates. Stable isotopes of oxygen and hydrogen naturally exist in water molecules that can provide such observational constraints. We analyzed the relationship between RT and precipitation isotopes (δ<sup>2</sup>H and δ<sup>18</sup>O) across different climatic zones in Eurasia from 1980 to 2020. Our analysis reveals that: (1) Both precipitation isotopes and RT showed significant increasing trends during 1980–2020. The increase in RT corresponds to weakened net isotopic distillation over Eurasia, suggesting reduced atmospheric circulation intensity under warming conditions. (2) The spatial patterns of RT and precipitation isotopes vary significantly among different moisture source regions, reflecting distinct moisture transport and precipitation formation processes. (3) On long-term scales, RT generally shows positive correlations with precipitation isotopes, except in plateau regions. The RT-δ<sup>18</sup>O relationship exhibits latitude-dependent variations, with similar slopes in regions sharing common moisture sources. These findings enhance our understanding of the long-term controls on precipitation isotopic composition and atmospheric moisture cycling patterns across Eurasia.</div></div>","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"314 ","pages":"Article 107813"},"PeriodicalIF":4.5,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142723845","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Sensitivity of dust event simulation to dust emission schemes and meteorological forcing datasets in the Belt and Road regions: A case study

IF 4.5 2区地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES

Atmospheric Research

Pub Date : 2024-11-22 DOI: 10.1016/j.atmosres.2024.107817

Naidi Ren , Tie Dai , Yueming Cheng , Guangyu Shi

This study investigates the sensitivity of dust event simulation to dust emission schemes and meteorological forcing datasets in the Belt and Road regions, which we divided into three dust-affected regions: North Africa, the Middle East-central Asia, and East Asia. The Weather Research and Forecasting model with online coupled chemistry (WRF-Chem) is used to simulate a dust event in the Belt and Road regions from June 15 to 20, 2016. Nine experiments were conducted using three sets of dust emission schemes (GOCART, Goddard Global Ozone Chemistry Aerosol Radiation and Transport; AFWA, Air Force Weather Agency; UoC, University of Cologne) and three meteorological forcing datasets (NCEP FNL, National Centers for Environmental Prediction Final; ECMWF ERA5, European Centre for Medium-Range Weather Forecasts Reanalysis v5; JMA JRA-55, Japan Meteorological Agency 55-year Reanalysis). The accuracy and applicability of the schemes and datasets were verified and evaluated by the global atmospheric reanalysis data, Modern-Era Retrospective analysis for Research and Applications, version 2 (MERRA-2), as well as observed data from the AErosol RObotic NETwork (AERONET) and CloudAerosol Lidar with Orthogonal Polarization (CALIOP). The main conclusions drawn from the simulation of this dust event are as follows: In the Middle East-central Asia and East Asia, the uncertainty in the dust emission schemes is greater than that in the meteorological forcing datasets, while in North Africa, they are comparable. Among the schemes, GOCART is generally more applicable across the three dust-affected regions compared to AFWA and UoC. Additionally, JRA-55 shows a slight advantage over FNL and ERA5 in North Africa and the Middle East-central Asia. Significant differences in the spatial distribution of dust emissions are observed among experiments using different dust emission schemes, whereas slight differences are noted among those with different meteorological forcing datasets; notably, dust optical depth (DOD) distribution closely aligns with dust emissions.

{"title":"Sensitivity of dust event simulation to dust emission schemes and meteorological forcing datasets in the Belt and Road regions: A case study","authors":"Naidi Ren , Tie Dai , Yueming Cheng , Guangyu Shi","doi":"10.1016/j.atmosres.2024.107817","DOIUrl":"10.1016/j.atmosres.2024.107817","url":null,"abstract":"<div><div>This study investigates the sensitivity of dust event simulation to dust emission schemes and meteorological forcing datasets in the Belt and Road regions, which we divided into three dust-affected regions: North Africa, the Middle East-central Asia, and East Asia. The Weather Research and Forecasting model with online coupled chemistry (WRF-Chem) is used to simulate a dust event in the Belt and Road regions from June 15 to 20, 2016. Nine experiments were conducted using three sets of dust emission schemes (GOCART, Goddard Global Ozone Chemistry Aerosol Radiation and Transport; AFWA, Air Force Weather Agency; UoC, University of Cologne) and three meteorological forcing datasets (NCEP FNL, National Centers for Environmental Prediction Final; ECMWF ERA5, European Centre for Medium-Range Weather Forecasts Reanalysis v5; JMA JRA-55, Japan Meteorological Agency 55-year Reanalysis). The accuracy and applicability of the schemes and datasets were verified and evaluated by the global atmospheric reanalysis data, Modern-Era Retrospective analysis for Research and Applications, version 2 (MERRA-2), as well as observed data from the AErosol RObotic NETwork (AERONET) and CloudAerosol Lidar with Orthogonal Polarization (CALIOP). The main conclusions drawn from the simulation of this dust event are as follows: In the Middle East-central Asia and East Asia, the uncertainty in the dust emission schemes is greater than that in the meteorological forcing datasets, while in North Africa, they are comparable. Among the schemes, GOCART is generally more applicable across the three dust-affected regions compared to AFWA and UoC. Additionally, JRA-55 shows a slight advantage over FNL and ERA5 in North Africa and the Middle East-central Asia. Significant differences in the spatial distribution of dust emissions are observed among experiments using different dust emission schemes, whereas slight differences are noted among those with different meteorological forcing datasets; notably, dust optical depth (DOD) distribution closely aligns with dust emissions.</div></div>","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"314 ","pages":"Article 107817"},"PeriodicalIF":4.5,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142746462","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The modulation effect of the Victoria mode on the uncertainty connection between ENSO and winter European surface air temperature 维多利亚模式对厄尔尼诺/南方涛动与冬季欧洲地表气温之间不确定性联系的调节作用

IF 4.5 2区地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES

Atmospheric Research

Pub Date : 2024-11-20 DOI: 10.1016/j.atmosres.2024.107815

Kai Ji , Ruiqiang Ding , Linlu Mei

While El Niño-Southern Oscillation (ENSO) has widespread impacts on the climate around the Pacific and North America, the relationship between ENSO and winter surface air temperature (SAT) in Europe is less well established. This study investigates the modulation effects of the spring Victoria mode (VM) on the weak ENSO–SAT connection in the following winter based on reanalysis data and numerical experiments. It is shown that the connection between ENSO and the winter SAT in central Europe has a significant and positive (negative) correlation during the positive (negative) VM phase. Further analysis shows that the sea surface temperature (SST) anomalies associated with ENSO play an important role in the VM modulation. For the positive VM phase, ENSO combined with the SST warming mode in the western North Pacific induces the East Atlantic teleconnection pattern, which strengthens the anomalous warm advection and leads to the positive SAT anomalies in central Europe. In contrast, for the negative VM phase, ENSO could trigger a negative North Atlantic Oscillation pattern through intermediate SST anomalies in the tropical North Pacific, favoring the formation of the negative central European SAT anomalies. The remarkable modulation effect of the VM on the connection between ENSO and winter central European SAT is further verified through forced experiments using an atmospheric model. This could provide hope that ENSO can make predictions for the winter SAT in central Europe, considering the phase of the preceding spring VM.

厄尔尼诺-南方涛动（ENSO）对太平洋和北美气候的影响十分广泛，但欧洲ENSO与冬季地表气温（SAT）之间的关系却不太明确。本研究基于再分析数据和数值试验，研究了春季维多利亚模式（VM）对翌年冬季 ENSO 与 SAT 之间微弱联系的调节作用。结果表明，在维多利亚模式正（负）阶段，厄尔尼诺/南方涛动与欧洲中部冬季 SAT 之间的联系具有显著的正（负）相关性。进一步的分析表明，与厄尔尼诺/南方涛动相关的海面温度（SST）异常在 VM 调节中发挥了重要作用。在正的 VM 阶段，厄尔尼诺/南方涛动与北太平洋西部的海面温度变暖模式相结合，诱发了东大西洋远缘连接模式，从而加强了异常暖平流，导致欧洲中部出现正的 SAT 异常。相反，在负的 VM 阶段，厄尔尼诺/南方涛动可通过热带北太平洋的中间海温异常触发负的北大西洋涛动模式，有利于形成负的欧洲中部 SAT 异常。通过使用大气模型进行强迫实验，进一步验证了 VM 对厄尔尼诺/南方涛动与冬季欧洲中部 SAT 之间联系的显著调节作用。这为厄尔尼诺/南方涛动能够预测欧洲中部冬季 SAT 带来了希望，同时考虑到之前春季 VM 的阶段。

{"title":"The modulation effect of the Victoria mode on the uncertainty connection between ENSO and winter European surface air temperature","authors":"Kai Ji , Ruiqiang Ding , Linlu Mei","doi":"10.1016/j.atmosres.2024.107815","DOIUrl":"10.1016/j.atmosres.2024.107815","url":null,"abstract":"<div><div>While El Niño-Southern Oscillation (ENSO) has widespread impacts on the climate around the Pacific and North America, the relationship between ENSO and winter surface air temperature (SAT) in Europe is less well established. This study investigates the modulation effects of the spring Victoria mode (VM) on the weak ENSO–SAT connection in the following winter based on reanalysis data and numerical experiments. It is shown that the connection between ENSO and the winter SAT in central Europe has a significant and positive (negative) correlation during the positive (negative) VM phase. Further analysis shows that the sea surface temperature (SST) anomalies associated with ENSO play an important role in the VM modulation. For the positive VM phase, ENSO combined with the SST warming mode in the western North Pacific induces the East Atlantic teleconnection pattern, which strengthens the anomalous warm advection and leads to the positive SAT anomalies in central Europe. In contrast, for the negative VM phase, ENSO could trigger a negative North Atlantic Oscillation pattern through intermediate SST anomalies in the tropical North Pacific, favoring the formation of the negative central European SAT anomalies. The remarkable modulation effect of the VM on the connection between ENSO and winter central European SAT is further verified through forced experiments using an atmospheric model. This could provide hope that ENSO can make predictions for the winter SAT in central Europe, considering the phase of the preceding spring VM.</div></div>","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"314 ","pages":"Article 107815"},"PeriodicalIF":4.5,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142723838","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Impacts of climate trends on the heavy precipitation event associated with Typhoon Doksuri in Northern China 气候趋势对与台风 "杜苏芮 "有关的华北强降水事件的影响

IF 4.5 2区地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES

Atmospheric Research

Pub Date : 2024-11-20 DOI: 10.1016/j.atmosres.2024.107816

Ziyu Yan , Zhuo Wang , Melinda Peng

The remnant inland circulation of Typhoon Doksuri induced catastrophic heavy precipitation in July 2023 in the Beijing-Tianjin-Hebei area of China. The role of climate trends in this event is investigated using the pseudo-global warming approach. The control experiment driven by the ERA5 reanalysis captures the intensity and spatial distribution of the heavy precipitation reasonably well. The effects of climate trends are investigated by removing climate trends in various variables from the boundary and initial conditions of the sensitivity experiments. The warming trend of sea surface temperature is found to enhance extreme precipitation intensity, while the specific humidity trend, which is positive over the ocean but negative in some inland regions, has negligible impacts on inland extreme precipitation. The impacts of atmospheric dynamic trends are found to be predominant, which alter the track of the remnant circulation, reduce precipitation intensity, and substantially change the spatial distribution of precipitation. This study highlights the importance of considering atmospheric dynamic trends when assessing the impacts of climate trends on typhoon remnant circulations over land, which may lead to extreme precipitation in regions that have rarely experienced such extremes before.

台风 "杜苏芮 "的残余内陆环流于 2023 年 7 月在中国京津冀地区引发了灾难性的强降水。本文采用伪全球变暖方法研究了气候趋势在此次事件中的作用。由ERA5再分析驱动的对照实验较好地捕捉了强降水的强度和空间分布。通过从敏感性实验的边界和初始条件中剔除各种变量的气候趋势，研究了气候趋势的影响。结果发现，海面温度的变暖趋势会增强极端降水强度，而比湿度的变化趋势对内陆极端降水的影响微乎其微。大气动态趋势的影响占主导地位，它改变了残余环流的轨迹，降低了降水强度，并极大地改变了降水的空间分布。这项研究强调了在评估气候趋势对陆地台风残余环流的影响时考虑大气动态趋势的重要性，这可能会导致以前很少经历极端降水的地区出现极端降水。

{"title":"Impacts of climate trends on the heavy precipitation event associated with Typhoon Doksuri in Northern China","authors":"Ziyu Yan , Zhuo Wang , Melinda Peng","doi":"10.1016/j.atmosres.2024.107816","DOIUrl":"10.1016/j.atmosres.2024.107816","url":null,"abstract":"<div><div>The remnant inland circulation of Typhoon Doksuri induced catastrophic heavy precipitation in July 2023 in the Beijing-Tianjin-Hebei area of China. The role of climate trends in this event is investigated using the pseudo-global warming approach. The control experiment driven by the ERA5 reanalysis captures the intensity and spatial distribution of the heavy precipitation reasonably well. The effects of climate trends are investigated by removing climate trends in various variables from the boundary and initial conditions of the sensitivity experiments. The warming trend of sea surface temperature is found to enhance extreme precipitation intensity, while the specific humidity trend, which is positive over the ocean but negative in some inland regions, has negligible impacts on inland extreme precipitation. The impacts of atmospheric dynamic trends are found to be predominant, which alter the track of the remnant circulation, reduce precipitation intensity, and substantially change the spatial distribution of precipitation. This study highlights the importance of considering atmospheric dynamic trends when assessing the impacts of climate trends on typhoon remnant circulations over land, which may lead to extreme precipitation in regions that have rarely experienced such extremes before.</div></div>","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"314 ","pages":"Article 107816"},"PeriodicalIF":4.5,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142684194","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evaluating the ALADIN-climate model reanalysis over Central Europe 评估 ALADIN-中欧气候模型再分析

IF 4.5 2区地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES

Atmospheric Research

Pub Date : 2024-11-19 DOI: 10.1016/j.atmosres.2024.107809

Romana Beranová , Michal Belda , Radmila Brožková , Lucie Pokorná , Jana Popová , Zuzana Rulfová , Zbyněk Sokol

Reanalysis is a well-established tool for monitoring the state of the atmosphere. This study aims at validating the ALADIN-Climate (AC) model reanalysis over Europe with a focus on Central Europe. The AC model is based on the ALARO model configuration and belongs to convection permitting models. Its horizontal resolution is 2.3 km. We evaluated a 25-year long period (1990–2014) and we performed the validation process using measurements from ground-based meteorological data over Europe to assess the ability of the AC model to simulate temperature, precipitation, relative humidity, wind speed, and global radiation. The AC model reanalysis tends to overestimate minimum daily temperature and underestimate maximum daily temperature, with larger differences observed during summer. Winter precipitation totals are overestimated by nearly 50 %, partly due to an overestimation of wet days, while summer precipitation is less overestimated (by 13 %). Relative humidity is consistently overestimated across the model domain in winter, whereas in summer it is variable. Wind speed is overestimated in both summer and winter, and global radiation is also overestimated, especially in winter. Although some variables, like winter precipitation, exhibit significant biases, the overall differences between the AC model reanalysis and station data are consistent with other reanalyses, such as CERRA and ERA5. Biases in the AC model reanalysis are not only caused by the model's imperfections and errors, but also by potential systematic errors at measuring stations. Given its high spatial resolution, this AC regional reanalysis offers a valuable source for further climate studies in Central Europe.

再分析是一种成熟的大气状态监测工具。这项研究旨在验证欧洲上空的 ALADIN-气候（AC）模式再分析，重点是中欧。AC 模式基于 ALARO 模式配置，属于对流允许模式。其水平分辨率为 2.3 千米。我们评估了长达 25 年的时间（1990-2014 年），并利用欧洲上空的地面气象数据进行了验证，以评估 AC 模式模拟温度、降水、相对湿度、风速和全球辐射的能力。AC 模式再分析倾向于高估日最低气温和低估日最高气温，夏季观测到的差异更大。冬季降水总量被高估了近 50%，部分原因是高估了潮湿天数，而夏季降水量被高估的程度较小（13%）。冬季整个模式域的相对湿度一直被高估，而夏季则不尽相同。风速在夏季和冬季都被高估，全球辐射也被高估，尤其是在冬季。虽然某些变量（如冬季降水量）存在明显偏差，但 AC 模式再分析与站点数据之间的总体差异与其他再分析（如 CERRA 和 ERA5）是一致的。AC 模式再分析的偏差不仅是由模式的不完善和误差造成的，也是由测站潜在的系统误差造成的。鉴于其较高的空间分辨率，AC 区域再分析为进一步研究中欧气候提供了宝贵的资料来源。

{"title":"Evaluating the ALADIN-climate model reanalysis over Central Europe","authors":"Romana Beranová , Michal Belda , Radmila Brožková , Lucie Pokorná , Jana Popová , Zuzana Rulfová , Zbyněk Sokol","doi":"10.1016/j.atmosres.2024.107809","DOIUrl":"10.1016/j.atmosres.2024.107809","url":null,"abstract":"<div><div>Reanalysis is a well-established tool for monitoring the state of the atmosphere. This study aims at validating the ALADIN-Climate (AC) model reanalysis over Europe with a focus on Central Europe. The AC model is based on the ALARO model configuration and belongs to convection permitting models. Its horizontal resolution is 2.3 km. We evaluated a 25-year long period (1990–2014) and we performed the validation process using measurements from ground-based meteorological data over Europe to assess the ability of the AC model to simulate temperature, precipitation, relative humidity, wind speed, and global radiation. The AC model reanalysis tends to overestimate minimum daily temperature and underestimate maximum daily temperature, with larger differences observed during summer. Winter precipitation totals are overestimated by nearly 50 %, partly due to an overestimation of wet days, while summer precipitation is less overestimated (by 13 %). Relative humidity is consistently overestimated across the model domain in winter, whereas in summer it is variable. Wind speed is overestimated in both summer and winter, and global radiation is also overestimated, especially in winter. Although some variables, like winter precipitation, exhibit significant biases, the overall differences between the AC model reanalysis and station data are consistent with other reanalyses, such as CERRA and ERA5. Biases in the AC model reanalysis are not only caused by the model's imperfections and errors, but also by potential systematic errors at measuring stations. Given its high spatial resolution, this AC regional reanalysis offers a valuable source for further climate studies in Central Europe.</div></div>","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"314 ","pages":"Article 107809"},"PeriodicalIF":4.5,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142684195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Estimation of radiative effects of deep convective cloud cores using SAPHIR & ScaRaB onboard Megha-Tropiques satellite 利用 Megha-Tropiques 卫星上的 SAPHIR 和 ScaRaB 估算深对流云核的辐射效应

IF 4.5 2区地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES

Atmospheric Research

Pub Date : 2024-11-19 DOI: 10.1016/j.atmosres.2024.107803

Sisma Samuel , Nizy Mathew , V. Sathiyamoorthy

The instantaneous radiative effects of cores of deep convective clouds (CDCCs) linked to well-organised long-lived convective system over the tropics is estimated for the first time using Megha-Tropiques (MT) during 2012‐–2018. Sondeur Atmosphérique du Profil d'Humidité Intertropicale par Radiométrie (SAPHIR) and Scanner for Radiation Budget (ScaRaB) onboard MT provides collocated and concurrent observations of CDCCs and associated fluxes on top-of-the-atmosphere (TOA), respectively. The vertical extent of CDCCs is estimated using collocated and concurrent CloudSat and SAPHIR observations. The CDCCs have a vertical extent above 10 km and their frequency of occurrence peaks between 13 and 16 km. CDCCs exert significant longwave radiative effect over the tropical Africa, northwest Pacific Ocean and northern Bay of Bengal during June–August with values ranging between 160 Wm⁻² and 180 Wm⁻². Over the convective core regions, the magnitude of day time (08–17 Local time) shortwave radiative effect of CDCCs (SWREC) ranges from −250 Wm⁻² to −650 Wm⁻² with peak values over northern Bay of Bengal and west Pacific Ocean during June to August. The SWREC aligns with both the incoming solar radiation and the occurrence frequency of CDCCs (OFCs), while the diurnal cycle of LWREC follows the OFCs, with a more pronounced variation over land. A diurnal amplitude of 30–40 Wm⁻² is observed in LWREC over the ocean,

\sim

60 Wm⁻² over land. The CDCCs exert a net radiative cooling ranging from −200 Wm⁻² to −550 Wm⁻² during daytime and a net warming during night time that reaches as high as 160 Wm⁻².

在 2012-2018 年期间，利用热带云（Megha-Tropiques，MT）首次估算了热带地区与组织良好的长寿命对流系统相关的深对流云（CDCCs）核心的瞬时辐射效应。MT上的Sondeur Atmosphérique du Profil d'Humidité Intertropicale par Radiométrie (SAPHIR)和Scanner for Radiation Budget (ScaRaB)分别提供了对CDCCs和相关通量在大气层顶部（TOA）的协同和同步观测。CDCCs 的垂直范围是利用同地和同期的 CloudSat 和 SAPHIR 观测数据估算的。CDCC的垂直范围在10千米以上，出现频率在13到16千米之间达到峰值。6-8月期间，CDCC在热带非洲、西北太平洋和孟加拉湾北部产生了明显的长波辐射效应，其值在160 Wm-2和180 Wm-2之间。在对流核心区域，白天（当地时间 08-17 点）的短波辐射效应（SWREC）在-250 Wm-2 到 -650 Wm-2 之间，6-8 月间在孟加拉湾北部和西太平洋达到峰值。SWREC与太阳辐射入射值和CDCC发生频率（OFCs）一致，而LWREC的昼夜周期与OFCs一致，在陆地上的变化更为明显。在海洋上观测到的 LWREC 日振幅为 30-40 Wm-2，在陆地上为∼60 Wm-2。CDCCs在白天会产生-200 Wm-2到-550 Wm-2的净辐射冷却，而在夜间则会产生高达160 Wm-2的净升温。

{"title":"Estimation of radiative effects of deep convective cloud cores using SAPHIR & ScaRaB onboard Megha-Tropiques satellite","authors":"Sisma Samuel , Nizy Mathew , V. Sathiyamoorthy","doi":"10.1016/j.atmosres.2024.107803","DOIUrl":"10.1016/j.atmosres.2024.107803","url":null,"abstract":"<div><div>The instantaneous radiative effects of cores of deep convective clouds (CDCCs) linked to well-organised long-lived convective system over the tropics is estimated for the first time using Megha-Tropiques (MT) during 2012‐–2018. Sondeur Atmosphérique du Profil d'Humidité Intertropicale par Radiométrie (SAPHIR) and Scanner for Radiation Budget (ScaRaB) onboard MT provides collocated and concurrent observations of CDCCs and associated fluxes on top-of-the-atmosphere (TOA), respectively. The vertical extent of CDCCs is estimated using collocated and concurrent CloudSat and SAPHIR observations. The CDCCs have a vertical extent above 10 km and their frequency of occurrence peaks between 13 and 16 km. CDCCs exert significant longwave radiative effect over the tropical Africa, northwest Pacific Ocean and northern Bay of Bengal during June–August with values ranging between 160 Wm<sup>−2</sup> and 180 Wm<sup>−2</sup>. Over the convective core regions, the magnitude of day time (08–17 Local time) shortwave radiative effect of CDCCs (SWREC) ranges from −250 Wm<sup>−2</sup> to −650 Wm<sup>−2</sup> with peak values over northern Bay of Bengal and west Pacific Ocean during June to August. The SWREC aligns with both the incoming solar radiation and the occurrence frequency of CDCCs (OFCs), while the diurnal cycle of LWREC follows the OFCs, with a more pronounced variation over land. A diurnal amplitude of 30–40 Wm<sup>−2</sup> is observed in LWREC over the ocean, <span><math><mo>∼</mo></math></span>60 Wm<sup>−2</sup> over land. The CDCCs exert a net radiative cooling ranging from −200 Wm<sup>−2</sup> to −550 Wm<sup>−2</sup> during daytime and a net warming during night time that reaches as high as 160 Wm<sup>−2</sup>.</div></div>","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"314 ","pages":"Article 107803"},"PeriodicalIF":4.5,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142701213","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Irrigation-induced decreases in reference evapotranspiration over the North China Plain 灌溉引起的华北平原参考蒸散量减少

IF 4.5 2区地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES

Atmospheric Research

Pub Date : 2024-11-19 DOI: 10.1016/j.atmosres.2024.107798

Guoshuai Liu , Weiguang Wang , Hui Xu

As a pivotal factor influencing crop water requirement, reference evapotranspiration (ET₀) plays a crucial role in agricultural water planning and management. Irrigation can exert distinct influences on ET₀ by modifying meteorological conditions through land-atmosphere coupling. While the climatic effects of irrigation in the North China Plain (NCP), the most intensively irrigated area over China, have been explored, the specific impact of irrigation on ET₀ remains unclear. To address this gap, we here employ a regional climate model coupled with a well-validated irrigation scheme to perform idealized simulations to investigate the responding behaviors of ET₀ to irrigation in the NCP from 2005 to 2014. We find that the incorporation of irrigation notably enhances the model performance in modeling ET₀ in the NCP. Irrigation induces an ET₀ decrease of −0.32 mm day⁻¹ (−29.4 mm year⁻¹) in spring and −0.38 mm day⁻¹ (−35.0 mm year⁻¹) in summer and an actual evapotranspiration (ET_a) increase of 0.49 mm day⁻¹ (45.1 mm year⁻¹) in spring and 0.40 mm day⁻¹ (36.8 mm year⁻¹) in summer, respectively. The irrigation-induced changes in ET₀ and ET_a adhere to the complementary principle, which stems from the land-atmosphere coupling. The decline in ET₀ is attributed to decreases in surface air temperature and wind speed, coupled with an increase in relative humidity due to irrigation, with the latter playing a paramount role. Furthermore, irrigation decouples the relationship between precipitation and ET_a and weakens the traditional dependence of ET_a on local precipitation. This study underscores that the related change in ET₀ due to the climate feedbacks of irrigation should be taken into account in agricultural water planning and management.

作为影响作物需水量的关键因素，参考蒸散量（ET0）在农业用水规划和管理中起着至关重要的作用。灌溉可通过土地-大气耦合改变气象条件，从而对 ET0 产生明显影响。华北平原是中国灌溉最密集的地区，虽然灌溉对该地区气候的影响已得到探讨，但灌溉对 ET0 的具体影响仍不清楚。针对这一空白，我们采用区域气候模式，结合经过验证的灌溉方案，对华北平原 2005 年至 2014 年的灌溉对 ET0 的响应行为进行了理想化模拟研究。我们发现，灌溉的加入显著提高了模型在模拟北太平洋地区 ET0 时的性能。灌溉分别导致春季蒸散发减少-0.32毫米/天-1（-29.4毫米/年-1）和夏季蒸散发减少-0.38毫米/天-1（-35.0毫米/年-1），以及春季实际蒸散发（ETa）增加0.49毫米/天-1（45.1毫米/年-1）和夏季实际蒸散发增加0.40毫米/天-1（36.8毫米/年-1）。灌溉引起的 ET0 和 ETa 的变化遵循互补原则，该原则源于陆地-大气耦合。ET0 的下降归因于地表气温和风速的下降，以及灌溉导致的相对湿度的增加，后者起着至关重要的作用。此外，灌溉使降水与蒸散发之间的关系脱钩，削弱了蒸散发对当地降水的传统依赖性。这项研究强调，在农业用水规划和管理中应考虑到灌溉的气候反馈引起的 ET0 的相关变化。

{"title":"Irrigation-induced decreases in reference evapotranspiration over the North China Plain","authors":"Guoshuai Liu , Weiguang Wang , Hui Xu","doi":"10.1016/j.atmosres.2024.107798","DOIUrl":"10.1016/j.atmosres.2024.107798","url":null,"abstract":"<div><div>As a pivotal factor influencing crop water requirement, reference evapotranspiration (ET<sub>0</sub>) plays a crucial role in agricultural water planning and management. Irrigation can exert distinct influences on ET<sub>0</sub> by modifying meteorological conditions through land-atmosphere coupling. While the climatic effects of irrigation in the North China Plain (NCP), the most intensively irrigated area over China, have been explored, the specific impact of irrigation on ET<sub>0</sub> remains unclear. To address this gap, we here employ a regional climate model coupled with a well-validated irrigation scheme to perform idealized simulations to investigate the responding behaviors of ET<sub>0</sub> to irrigation in the NCP from 2005 to 2014. We find that the incorporation of irrigation notably enhances the model performance in modeling ET<sub>0</sub> in the NCP. Irrigation induces an ET<sub>0</sub> decrease of −0.32 mm day<sup>−1</sup> (−29.4 mm year<sup>−1</sup>) in spring and −0.38 mm day<sup>−1</sup> (−35.0 mm year<sup>−1</sup>) in summer and an actual evapotranspiration (ET<sub>a</sub>) increase of 0.49 mm day<sup>−1</sup> (45.1 mm year<sup>−1</sup>) in spring and 0.40 mm day<sup>−1</sup> (36.8 mm year<sup>−1</sup>) in summer, respectively. The irrigation-induced changes in ET<sub>0</sub> and ET<sub>a</sub> adhere to the complementary principle, which stems from the land-atmosphere coupling. The decline in ET<sub>0</sub> is attributed to decreases in surface air temperature and wind speed, coupled with an increase in relative humidity due to irrigation, with the latter playing a paramount role. Furthermore, irrigation decouples the relationship between precipitation and ET<sub>a</sub> and weakens the traditional dependence of ET<sub>a</sub> on local precipitation. This study underscores that the related change in ET<sub>0</sub> due to the climate feedbacks of irrigation should be taken into account in agricultural water planning and management.</div></div>","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"314 ","pages":"Article 107798"},"PeriodicalIF":4.5,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142684231","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Opposite summer precipitation anomalies over the Maritime Continent in fast and slow decaying El Niño cases 在厄尔尼诺现象快速衰减和缓慢衰减的情况下，海洋大陆夏季降水异常现象截然相反

IF 4.5 2区地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES

Atmospheric Research

Pub Date : 2024-11-19 DOI: 10.1016/j.atmosres.2024.107814

Zhichao Yang , Chujie Gao , Gen Li , Yang Li , Bei Xu , Dezhi Zhang , Zhi Yuan , Xuanke Wang

Summer precipitation over the Maritime Continent (MC) is tightly connected to livelihoods of the locals, and the corresponding strong convective activities are also crucial to Asian regional climate variations remotely. Using observational and reanalysis data from 1958 to 2020, we found that El Niño with different decay rates can cause different summer precipitation anomalies in the MC area. In the fast decaying (FD) El Niño summer, the MC area shows a precipitation surplus, while the MC precipitation decreases during the slow decaying (SD) El Niño summer. For the FD El Niño, the equatorial central-eastern Pacific warm sea surface temperature (SST) anomaly quickly turns into cold in the decaying summer, while the SST over MC region sustains a warm anomaly owing to the Indo-western Pacific Ocean capacitor effect. This local warm SST anomaly leads to anomalous ascent and then excessive precipitation, further stimulating low-level easterly wind to east of the MC with increased water vapor transport. For the SD El Niño, the central-eastern Pacific warm SST anomaly sustains till the decaying summer, continuously adjusting the Walker circulation. An anomalous local descent motion associated with the weakened Walker circulation region hampers the MC precipitation in summer. Our findings benefit the local researches of the MC summer climate variations, and potentially favor the regional climate predictions.

海洋大陆（MC）的夏季降水与当地居民的生活息息相关，相应的强对流活动对亚洲区域气候的远程变化也至关重要。利用 1958 年至 2020 年的观测和再分析数据，我们发现不同衰减速率的厄尔尼诺现象会导致海洋大陆地区夏季降水异常的不同。在快速衰减（FD）的厄尔尼诺夏季，管委会地区降水过剩，而在缓慢衰减（SD）的厄尔尼诺夏季，管委会降水减少。在夏季衰减期，赤道中东太平洋暖海面温度异常迅速转为冷海面温度异常，而受印度洋-西太平洋电容效应影响，管委会地区的暖海面温度异常持续存在。这种局地暖的 SST 异常导致异常上升和过量降水，进一步刺激低层偏东风向 MC 以东移动，增加了水汽输送。在 SD 厄尔尼诺现象中，中东太平洋暖海温异常持续到夏季衰减，不断调整沃克环流。与减弱的沃克环流区域相关的异常局地下降运动阻碍了夏季 MC 降水。我们的研究结果有利于对地中海夏季气候变迁的局地研究，并可能有利于区域气候预测。

{"title":"Opposite summer precipitation anomalies over the Maritime Continent in fast and slow decaying El Niño cases","authors":"Zhichao Yang , Chujie Gao , Gen Li , Yang Li , Bei Xu , Dezhi Zhang , Zhi Yuan , Xuanke Wang","doi":"10.1016/j.atmosres.2024.107814","DOIUrl":"10.1016/j.atmosres.2024.107814","url":null,"abstract":"<div><div>Summer precipitation over the Maritime Continent (MC) is tightly connected to livelihoods of the locals, and the corresponding strong convective activities are also crucial to Asian regional climate variations remotely. Using observational and reanalysis data from 1958 to 2020, we found that El Niño with different decay rates can cause different summer precipitation anomalies in the MC area. In the fast decaying (FD) El Niño summer, the MC area shows a precipitation surplus, while the MC precipitation decreases during the slow decaying (SD) El Niño summer. For the FD El Niño, the equatorial central-eastern Pacific warm sea surface temperature (SST) anomaly quickly turns into cold in the decaying summer, while the SST over MC region sustains a warm anomaly owing to the Indo-western Pacific Ocean capacitor effect. This local warm SST anomaly leads to anomalous ascent and then excessive precipitation, further stimulating low-level easterly wind to east of the MC with increased water vapor transport. For the SD El Niño, the central-eastern Pacific warm SST anomaly sustains till the decaying summer, continuously adjusting the Walker circulation. An anomalous local descent motion associated with the weakened Walker circulation region hampers the MC precipitation in summer. Our findings benefit the local researches of the MC summer climate variations, and potentially favor the regional climate predictions.</div></div>","PeriodicalId":8600,"journal":{"name":"Atmospheric Research","volume":"314 ","pages":"Article 107814"},"PeriodicalIF":4.5,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700358","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0