Atmospheric and Oceanic Science Letters最新文献

{"title":"Trends of surface ozone based on hourly concentrations in the Beijing–Tianjin–Hebei region during 2017–2021","authors":"Xiaoyan Wang,&nbsp;Huihui Zheng,&nbsp;Bing Liu,&nbsp;Shuyan Xie,&nbsp;Yonghai Huang,&nbsp;Shuai Wang","doi":"10.1016/j.aosl.2024.100514","DOIUrl":"10.1016/j.aosl.2024.100514","url":null,"abstract":"<div><div>As a typical secondary air pollutant, surface ozone has been monitored routinely since 2013 in China. Most studies on the spatiotemporal variation of ozone have been centered around the daily maximum 8-h average, with little attention paid to the trends of hourly ozone, especially hourly ozone exceedances. Focusing on hourly ozone exceedances and peak values, the spatiotemporal trends of hourly ozone at 77 sites in 13 cities of the Beijing–Tianjin–Hebei (BTH) region during 2017–2021 were analyzed in this study. The number of hours with exceedances (<em>N</em>_H200) in 2019 was nearly three times that of 2021. On a five-year average, the percentage of cumulative <em>N</em>_H200 in June accounted for up to 40.5 % of all hourly exceedances. Cities in central Hebei Province had the highest cumulative annual <em>N</em>_H200. June had the highest average hourly ozone exceeded multiples of 0.158. The top two cities with the highest average exceeded multiple were Tangshan (0.166) and Beijing (0.158). Tangshan and Xingtai ranked as the top two in terms of the mean of the 10 highest daily maximum ozone concentrations (MTDM), with 286.74 and 285.37 µg m⁻³, respectively. The gap between the MTDM and the daily maximum of hourly ozone averaged over all sites had narrowed to 97.88 µg m⁻³ in 2021, much lower than that in other years, which indicated that the stability and convergence of ozone pollution in BTH region had been enhanced in 2021 to some extent.</div><div>摘要</div><div>本文以京津冀地区为研究对象, 采用国际常用的评价指标, 在分析2017–2021年臭氧小时浓度变化趋势的基础上, 重点讨论了小时浓度超标情况及其峰值水平. 结果显示, 2019年臭氧小时浓度超标数约为2021年的3倍, 6月份小时浓度超标数占比高达40.5%, 河北中部城市小时浓度超标情况突出; 2017年和2019年臭氧小时浓度超标倍数在高位区间的占比相对最高, 唐山和邢台的小时浓度峰值水平相对较高. 本文可为后续进一步研究局地臭氧污染特征和异常污染事件提供基础参考.</div></div>","PeriodicalId":47210,"journal":{"name":"Atmospheric and Oceanic Science Letters","volume":"17 6","pages":"Article 100514"},"PeriodicalIF":2.3,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141042929","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Implications of the extremely hot summer of 2022 on urban ozone control in China","authors":"Wenhao Qiao,&nbsp;Ke Li,&nbsp;Zhenjiang Yang,&nbsp;Lei Chen,&nbsp;Hong Liao","doi":"10.1016/j.aosl.2024.100470","DOIUrl":"10.1016/j.aosl.2024.100470","url":null,"abstract":"<div><div>Frequent occurrences of extreme heat are causing severe ozone pollution over China. This study examined the driving factors of urban ozone pollution in China during the extremely hot summer of 2022 and the impact of emission control strategies using surface measurements and the GEOS-Chem model. The results show that ozone pollution was extremely severe in summer 2022, with a significant rebound by 12–15 ppbv in the North China Plain (NCP), Yangtze River Delta (YRD), and Sichuan basin (SCB), compared to 2021. Especially over the NCP, the MDA8 (maximum daily 8-hourly average) ozone exceeded 160 ppbv, and the number of ozone exceedances was over 42 days. Based on an IPR (integrated process rate) analysis, the authors found that the net chemical production was the dominant factor contributing to the strong ozone increase in summer 2022. For example, in June over the NCP, the net chemical production resulted in an increase by 3.08 Gg d⁻¹ (∼270%) in ozone mass change. Sensitivity simulations showed that both NO_<em>x</em> (nitrogen oxides) and VOC (volatile organic compound) reductions were important over the NCP, and NO_<em>x</em> reductions were more important than VOCs over southern China. To keep the ozone of 2022 at the same level as 2021, a joint reduction of NO_<em>x</em> and VOCs by at least 50%–60% would have been required. This study highlights the urgency to develop effective ozone management since extreme heat will become more frequent.</div><div>摘要</div><div>本文利用地面观测和数值模式研究了2022年夏季极端高温下我国城市臭氧污染的控制策略. 研究表明, 2022年夏季臭氧污染极为严重, 相较于2021年有显著的反弹, 其中华北, 长三角和四川盆地的月均臭氧上升12–15 ppbv. 模式过程分析结果表明净化学生产是高温时造成臭氧浓度升高的主导因素. 模式多组敏感性试验表明, 华北地区需要NO<em>_x</em>和VOC协同控制, 南方城市需要侧重对NO<em>_x</em>排放管控, 并且需要对NO<em>_x</em>和VOC协同减排至少50%–60% 才会使2022年夏季臭氧污染水平与2021年一致. 在极端高温愈发频繁的形势下, 本研究强调未来亟需研究更为有效的臭氧调控策略.</div></div>","PeriodicalId":47210,"journal":{"name":"Atmospheric and Oceanic Science Letters","volume":"17 6","pages":"Article 100470"},"PeriodicalIF":2.3,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139891779","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impacts of global biogenic isoprene emissions on surface ozone during 2000–2019","authors":"Yang Cao ,&nbsp;Xu Yue","doi":"10.1016/j.aosl.2024.100490","DOIUrl":"10.1016/j.aosl.2024.100490","url":null,"abstract":"<div><div>Biogenic isoprene is an important precursor of tropospheric ozone (O₃). Here, a coupled chemistry–vegetation model was used to quantify the contributions of isoprene emissions to surface O₃ pollution on the global scale during 2000–2019. The biogenic isoprene emissions showed high values in mid–low latitudes and seasonal peaks in the summer hemispheres. They promote global surface O₃ concentrations by 1.75 ppbv annually with regional hotspots of 4.39 ppbv (8.8%) in China and 5.36 ppbv (11.1%) in the U.S. in boreal summer. In the past two decades, isoprene emissions increased by 1.32 TgC yr⁻¹ (0.67% yr⁻¹) in the Northern Hemisphere but decreased by 0.71 TgC yr⁻¹ (0.44% yr⁻¹) in the Southern Hemisphere. Such changes of isoprene made opposite contributions to the surface O₃ trend, with 0.26 ppbv yr⁻¹ in eastern China but −0.32 ppbv yr⁻¹ in the southeastern U.S. due to the changes in the background regime of chemical reactions. The impact of anthropogenic changes on the O₃ trend is consistent with that of biogenic isoprene, but two to four times stronger in magnitude. This study revealed that the effective control of anthropogenic NO_<em>x</em> emissions could mitigate regional O₃ pollution even with the increased isoprene emissions under global warming.</div></div>","PeriodicalId":47210,"journal":{"name":"Atmospheric and Oceanic Science Letters","volume":"17 6","pages":"Article 100490"},"PeriodicalIF":2.3,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140398368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhanced nitrous acid (HONO) formation via NO2 uptake and its potential contribution to heavy haze formation during wintertime","authors":"Zirui Liu ,&nbsp;Rong Yang ,&nbsp;Jingyun Liu ,&nbsp;Keding Lu ,&nbsp;Guiqian Tang ,&nbsp;Yuepeng Pan ,&nbsp;Dongsheng Ji ,&nbsp;Yuesi Wang ,&nbsp;Bo Hu","doi":"10.1016/j.aosl.2024.100491","DOIUrl":"10.1016/j.aosl.2024.100491","url":null,"abstract":"<div><div>A full understanding of the sources of atmospheric nitrous acid (HONO) in the polluted urban atmosphere remains a challenge. In this study, ambient HONO and relevant species were measured during January 2019 at an urban site in Beijing, China, and a budget analysis of HONO was conducted using a box model combined with field observations. Large nighttime “missing sources” of HONO were identified on heavily polluted days based on traditional sources, which had a significant correlation with the relative humidity, ammonia (NH₃), and aerosol surface area, and the promotional effect of NH₃ for nitrogen dioxide (NO₂) uptake on the wet aerosol surface was discussed. Then, an updated parameterization scheme for quantifying the enhanced heterogeneous reactions of NO₂ on aerosol surfaces is proposed, and the missing nighttime sources of HONO could be substantially compensated after the new scheme was incorporated. Further evaluation on the contributions of HONO to hydroxyl radicals was conducted, and the authors found that the photolysis of HONO played a dominant role in the primary OH production on the polluted days (78%–90%). The study reveals great potential of an NH₃-enhanced uptake coefficient of NO₂ on the aerosol surface in the nocturnal HONO budget, and highlights the significance of HONO in the strong atmospheric oxidation capability during episodes with a heavily polluted atmosphere.</div><div>摘要</div><div>本文研究了重污染过程中气态亚硝酸 (HONO) 的关键来源并基于化学箱模型对其源汇过程进行了闭合分析. 结果显示, 现有的HONO 源汇机制并不能解释观测期间出现的高HONO事件, 尤其是重污染过程夜间存在大量的HONO \"未知源\". 本文提出了一套新的HONO 源汇参数化方案, 可以较好的模拟观测期间HONO日间和夜间来源, 并进一步评估了HONO 对羟基自由基 (OH) 的贡献, 发现 HONO 光解主导了重污染天OH生成 (78%–90%). 研究结果揭示了华北城市富氨大气环境促进 NO₂在气溶胶表面的摄取和非均相反应进而主导了夜间HONO生成, 凸显了HONO化学对于重污染过程维持大气氧化能力的重要作用.</div></div>","PeriodicalId":47210,"journal":{"name":"Atmospheric and Oceanic Science Letters","volume":"17 6","pages":"Article 100491"},"PeriodicalIF":2.3,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140401827","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Clarifying the relationship between PM2.5 and ozone complex pollution and synoptic patterns in a typical petrochemical city in the Bohai Rim region of China: Implications for air pollution forecasting and control","authors":"Yongxin Yan ,&nbsp;Cong An ,&nbsp;Junling Li ,&nbsp;Yuanyuan Ji ,&nbsp;Rui Gao ,&nbsp;Hong Wang ,&nbsp;Fanyi Shang ,&nbsp;Linlin Ma ,&nbsp;Xiaoshuai Gao ,&nbsp;Hong Li","doi":"10.1016/j.aosl.2024.100539","DOIUrl":"10.1016/j.aosl.2024.100539","url":null,"abstract":"<div><div>Meteorological conditions are vital to PM_2.5 and ozone (O₃) complex pollution. Herein, the T-mode principal component analysis method was employed to objectively classify the 925-hPa geopotential height field of Dongying from 2017 to 2022. Synoptic patterns associated with four pollution types—namely, PM_2.5-only pollution, O₃-only pollution, Co-occurring of PM_2.5 and O₃ pollution, Non-occurring of PM_2.5 and O₃ pollution—were characterized at different time scales. The results indicated that synoptic classes conducive to PM_2.5-only pollution were “high-pressure top front”, “offshore high-pressure rear”, and “high-pressure inside”, while those conducive to O₃-only pollution were “offshore high-pressure rear”, “subtropical high”, and “high and low systems”. The Co-occurring of PM_2.5 and O₃ pollution were influenced by high pressure, and the Non-occurring of PM_2.5 and O₃ pollution were linked to precipitation and strong northerly winds. The variation in dominant synoptic patterns is crucial in the frequency changes of the four pollution types, which was further validated through the analysis of typical cases. Under the favorable meteorological conditions of high-pressure control with strong northerly winds or a subtropical high and inverted trough both with strong precipitation, there is potential to achieve coordinated control of PM_2.5 and O₃ in Dongying. Additionally, measures like artificially manipulating local humidity could be adopted to alleviate pollution levels. This study reveals the importance of comprehending the meteorological factors contributing to the formation of PM_2.5 and O₃ complex pollution for the improvement of urban air quality in the Bohai Rim region of China when emissions are high and the concentration of air pollutants exhibits high meteorological sensitivity.</div><div>摘要</div><div>本文研究了中国环渤海地区典型石化城市东营市近年来PM_2.5与臭氧复合污染的天气形势特征. 结果表明, 有利于促发PM_2.5单独污染的环流形势与高压顶前部型, 海上高压后部型, 高压内部型有关; 有利于促发臭氧单独污染的天气型与海上高压后部, 副高和高低值系统有关; PM_2.5和臭氧双高污染的发生主要受高压系统的控制; 不利于PM_2.5和臭氧污染发生的环流类型则与降水和较强的偏北风有关. 优势天气型的变化是导致四种污染类型发生频率变化的重要因素. 研究结果揭示了当一次排放处于高位, 且空气污染物浓度变化具有高气象敏感性的情况下, 弄清PM_2.5和臭氧复合污染的气象成因对于中国环渤海地区城市空气质量持续改善的重要意义.</div></div>","PeriodicalId":47210,"journal":{"name":"Atmospheric and Oceanic Science Letters","volume":"17 6","pages":"Article 100539"},"PeriodicalIF":2.3,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656366","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Coordinated control of PM2.5 and O3: Investigating the physical and chemical processes underlying regional complex air pollution","authors":"Aijun Ding ,&nbsp;Meigen Zhang ,&nbsp;Likun Xue","doi":"10.1016/j.aosl.2024.100562","DOIUrl":"10.1016/j.aosl.2024.100562","url":null,"abstract":"","PeriodicalId":47210,"journal":{"name":"Atmospheric and Oceanic Science Letters","volume":"17 6","pages":"Article 100562"},"PeriodicalIF":2.3,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656427","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Vertical distributions of VOCs in the Tibetan Plateau background region","authors":"Xuanxuan Xue ,&nbsp;Fugeng Zha ,&nbsp;Yinghong Wang ,&nbsp;Yang Zhang ,&nbsp;Yu Wang ,&nbsp;Ying Shen ,&nbsp;Yanyu Kang ,&nbsp;Dan Yao ,&nbsp;Guiqian Tang ,&nbsp;Jianchun Bian ,&nbsp;Yuesi Wang","doi":"10.1016/j.aosl.2024.100516","DOIUrl":"10.1016/j.aosl.2024.100516","url":null,"abstract":"<div><div>Exploring the vertical variation in volatile organic compounds (VOCs) in background regions can provide information on the spatial distribution of pollutants, providing a scientific basis for atmospheric pollution prevention and control strategies. From 15 August to 5 September 2023, at the Southeast Tibet Mountain Comprehensive Environmental Observation Station (SETS), a tethered balloon was used to sample VOCs every 100 m from the ground to 1000 m. A total of 403 air bag samples were collected, and 39 vertical profiles of VOCs were obtained. Ninety-two VOC species were detected. The VOC concentration at the SETS did not change significantly vertically, and the average VOC concentration was 11.1 ± 2.4 ppbv. The main components were alkanes (51.4 %), alkenes (18.7 %), and halohydrocarbons (18.1 %). There was no obvious diurnal change in VOCs and no significant difference between the different layers. When the surface VOC concentration was less than 10 ppbv, the concentrations, components, and sources of VOCs were evenly distributed vertically, and the main sources of VOCs at different heights were vehicle exhaust and background. When the surface VOC concentration exceeded 10 ppbv, the VOC concentration gradually decreased with height. The proportion of alkanes in surface VOCs increased, and the source was mainly vehicle exhaust. This study confirmed that VOCs are vertically homogeneous in the background of the Tibetan Plateau, emphasizing the importance of vehicle emissions as a potential source of VOCs.</div><div>摘要</div><div>研究背景区域挥发性有机物 (VOCs) 的垂直变化规律, 可以提供污染物的空间分布信息, 为制定大气污染防治策略提供科学依据. 2023年夏季, 利用系留气艇对藏东南背景区域VOCs垂直分布规律进行研究, 共获取92种VOC的39条垂直廓线. 结果表明, VOC浓度垂直分布均一, 平均浓度为11.1 ± 2.4 ppbv; 主要成分为烷烃 (51.4 %), 烯烃 (18.7 %) 和卤代烃 (18.1 %). 地表VOC浓度小于10 ppbv时, 不同高度VOCs的主要来源为机动车尾气和背景贡献. 而地表VOC浓度超过10 ppbv时, 烷烃占比增加, 来源以机动车尾气为主. 该研究证实了青藏高原VOC在垂直方向上分布均一, 强调了机动车排放作为VOCs潜在来源的重要性.</div></div>","PeriodicalId":47210,"journal":{"name":"Atmospheric and Oceanic Science Letters","volume":"17 6","pages":"Article 100516"},"PeriodicalIF":2.3,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141028294","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Global warming intensifies once-in-a-decade extreme precipitation in summer in China","authors":"Aoqi Zhou ,&nbsp;Chaoxia Yuan","doi":"10.1016/j.aosl.2024.100561","DOIUrl":"10.1016/j.aosl.2024.100561","url":null,"abstract":"<div><div>The intensification of extreme precipitation (EP) under global warming presents a substantial risk to human safety and societal progress. Studying the specific impacts of global warming on rare EP events in China not only enhances the comprehension of these shifts, but also paves the way for the development of proactive strategies to alleviate associated damages. Results from large-ensemble simulation data demonstrate that global warming has led to an enhancement in once-in-a-decade EP events in parts of western and central China over the past few decades, with the strengthening of the South Asia high (SAH) caused by global warming playing a dominant role. The strengthening of the SAH corresponds to an intensification and westward extension of the western Pacific subtropical high in the lower troposphere. The region between these two systems experiences enhanced upward motion and increased southwesterly water vapor transport, leading to a rise in climatological precipitation in western and central China, thereby raising the threshold for once-in-a-decade EP events.</div><div>摘要</div><div>全球变暖下极端降水 （EP） 的加剧对人类安全和社会发展构成了重大威胁. 研究全球变暖对中国罕见极端降水事件的影响， 不仅能加深大家对这些变化的理解， 还为制定应对政策铺平了道路. 大样本模拟数据表明， 在过去几十年中， 全球变暖加剧了中国西部和中部部分地区十年一遇的极端降水事件， 其中因全球变暖而增强的南亚高压 （SAH） 起到了主导作用. SAH的增强与对流层低层西太副高的增强西伸密切相关. 这两个系统间的区域经历了更强的上升运动和增强的西南水汽输送， 导致中国西部和中部的气候态降水增加， 从而提高了十年一遇极端降水事件的阈值.</div></div>","PeriodicalId":47210,"journal":{"name":"Atmospheric and Oceanic Science Letters","volume":"18 4","pages":"Article 100561"},"PeriodicalIF":2.3,"publicationDate":"2024-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144169723","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluating vector winds over eastern China in 2022 predicted by the CMA-MESO model and ECMWF forecast","authors":"Fang Huang ,&nbsp;Mingjian Zeng ,&nbsp;Zhongfeng Xu ,&nbsp;Boni Wang ,&nbsp;Ming Sun ,&nbsp;Hangcheng Ge ,&nbsp;Shoukang Wu","doi":"10.1016/j.aosl.2024.100559","DOIUrl":"10.1016/j.aosl.2024.100559","url":null,"abstract":"<div><div>Vector winds play a crucial role in weather and climate, as well as the effective utilization of wind energy resources. However, limited research has been conducted on treating the wind field as a vector field in the evaluation of numerical weather prediction models. In this study, the authors treat vector winds as a whole by employing a vector field evaluation method, and evaluate the mesoscale model of the China Meteorological Administration (CMA-MESO) and ECMWF forecast, with reference to ERA5 reanalysis, in terms of multiple aspects of vector winds over eastern China in 2022. The results show that the ECMWF forecast is superior to CMA-MESO in predicting the spatial distribution and intensity of 10-m vector winds. Both models overestimate the wind speed in East China, and CMA-MESO overestimates the wind speed to a greater extent. The forecasting skill of the vector wind field in both models decreases with increasing lead time. The forecasting skill of CMA-MESO fluctuates more and decreases faster than that of the ECMWF forecast. There is a significant negative correlation between the model vector wind forecasting skill and terrain height. This study provides a scientific evaluation of the local application of vector wind forecasts of the CMA-MESO model and ECMWF forecast.</div><div>摘要</div><div>本文利用矢量场评估VFE方法, 从矢量场角度系统性评估CMA-MESO模式与ECMWF模式对2022年华东地区10 m高度矢量风场的预报技巧. 结果表明, ECMWF模式对矢量风场空间分布与风场强度的预报均优于CMA-MESO模式. CMA-MESO模式明显高估了矢量风场的强度. 模式预报技巧随着预报时效的延长而下降, 其中以CMA-MESO模式的预报技巧波动更大, 衰减更迅速. 本研究将为CMA-MESO模式与ECMWF模式风场预报产品的本地化应用, 提供一个科学的评估依据.</div></div>","PeriodicalId":47210,"journal":{"name":"Atmospheric and Oceanic Science Letters","volume":"18 4","pages":"Article 100559"},"PeriodicalIF":2.3,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144169722","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fluctuations in the relationship between the Silk Road Pattern and the summer North Atlantic Oscillation","authors":"Yong Liu ,&nbsp;Zhencai Du","doi":"10.1016/j.aosl.2024.100558","DOIUrl":"10.1016/j.aosl.2024.100558","url":null,"abstract":"<div><div>This study investigated the fluctuations in the relationship between the Silk Road Pattern (SRP) and the boreal summer North Atlantic Oscillation (SNAO). The results indicated that the SRP–SNAO relationship was relatively weak during 1958–2022, which was primarily due to fluctuations, particularly the reversal in their relationship since the late 1990s. Using wavelet coherence analysis, the authors identified a strong SRP–SNAO linkage on a 4–8-yr timescale, in particular during the mid-1970s to the early/mid-1990s. This strong linkage is mainly attributable to the intensification and eastward movement of the southern part of the SNAO around the mid/late 1970s, which favored the strong connection between the SNAO and the SRP. Additionally, the interdecadal changes of the atmospheric circulations over the North Atlantic and Eurasia around the mid/late 1970s that resembled the circulation anomalies related to the strong SRP–SNAO linkage, may also have provided a favorable background for the strong connection between the two teleconnections. These findings on the fluctuations in the SRP–SNAO linkage may offer important implications for understanding the impact of the SNAO on the SRP and the variability of the SRP.</div><div>摘要</div><div>本文利用近60年大气再分析数据, 研究了丝绸之路型遥相关 (Silk Road Pattern, SRP) 与夏季北大西洋涛动 (North Atlantic Oscillation, SNAO) 关系的不稳定性及其可能成因. 结果表明, 近60年来, SRP与SNAO的关系具有明显的不稳定性. 两者关系在1970s中期至1990s中期显著增强, 特别在4-8年时间尺度上. 两者关系的增强主要与1970s中后期以来SNAO南部中心增强, 位置东移有关. 同时, 北大西洋和欧亚区域夏季大气环流在1970s末的年代际异常也为两者之间关系的增强提供了有利的气候背景.</div></div>","PeriodicalId":47210,"journal":{"name":"Atmospheric and Oceanic Science Letters","volume":"18 4","pages":"Article 100558"},"PeriodicalIF":2.3,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144169721","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}