Atmospheric Research最新文献_第6页

The June 2024 middle east compound heatwave: Dynamical drivers and AI-weather forecast models' evaluation 2024年6月中东复合热浪：动力驱动因素与人工智能天气预报模型评价

IF 5.5 2区地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES

Atmospheric Research

Pub Date : 2026-01-22 DOI: 10.1016/j.atmosres.2026.108779

Narendra Nelli, Diana Francis, Ricardo Fonseca, Pedram Hassanzadeh, Charfeddine Cherif

引用次数: 0

City-produced and transported black carbon: Synergy of in-situ optical measurements and modeling 城市生产和运输的黑碳：原位光学测量和建模的协同作用

IF 4.4 2区地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES

Atmospheric Research

Pub Date : 2026-01-20 DOI: 10.1016/j.atmosres.2025.108731

F. Moritz Hey , Agnė Minderytė , Emeka A. Ugboma , Nikolaos Evangeliou , Sabine Eckhardt , Ignacio Pisso , Steigvilė Byčenkienė , Iwona S. Stachlewska

The implementation of air pollution mitigation strategies requires not only high-quality continuous measurements of pollutants but also proper definitions of ways to differentiate between transported and locally produced contributions, as only the latter can be effectively reduced by authorities. To address this issue, we propose a new approach for partitioning monitored black carbon (BC) concentrations into city-produced (urban) and transported fractions using a combination of measured and modeled data. Two simultaneous measurement campaigns (warm season 2022 and cold season 2022/23) were conducted in two urban environments: Vilnius (Lithuania) and Warsaw (Poland). In the cold season in Warsaw, BC mass concentration was 90% higher than in the warm season, while in Vilnius, an increase of 44% was observed, as compared to the warm season. Aerosol optical properties showed more complex aerosol mixtures of dust, BC and brown carbon (BrC) during the cold season, forming larger particles. Single scattering albedo (SSA) anti-correlated with BC_FF, proving that fossil fuel (FF) combustion contributes to the warming effect in both cities. A positive correlation between the population density of the emission areas of transported BC and the BC mass concentrations in Vilnius and Warsaw was found. The impact of transported BC on the local BC levels in the cities was of

53 \pm 8

% and

36 \pm 28

% in the cold season and of

23 \pm 7

% and

13 \pm 21

% in the warm season for Warsaw and Vilnius, respectively. Thus, the approach of BC partitioning showed that in the cold season, the two cities suffered from worse air quality, in part due to more transported BC.

执行空气污染缓解战略不仅需要对污染物进行高质量的连续测量，而且需要适当定义区分运输和当地生产贡献的方法，因为只有后者才能由当局有效减少。为了解决这个问题，我们提出了一种新的方法，将监测到的黑碳（BC）浓度划分为城市生产（城市）和运输的部分，使用测量和建模数据的组合。在维尔纽斯（立陶宛）和华沙（波兰）两个城市环境中同时开展了两项测量活动（2022年暖季和2022/23年冷季）。在华沙的寒冷季节，BC的质量浓度比温暖季节高90%，而在维尔纽斯，与温暖季节相比，增加了44%。气溶胶光学特性显示，在寒冷季节，粉尘、BC和棕色碳（BrC）的气溶胶混合物更加复杂，形成更大的颗粒。单散射反照率（SSA）与BCFF呈负相关，证明了化石燃料（FF）燃烧对两个城市的增温效应有贡献。在维尔纽斯和华沙，迁移的BC排放区人口密度与BC质量浓度呈正相关。华沙和维尔纽斯在寒冷季节对当地BC水平的影响分别为53±8%和36±28%，暖季分别为23±7%和13±21%。因此，BC划分的方法表明，在寒冷季节，两个城市的空气质量更差，部分原因是BC的运输更多。

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引用次数: 0

Dual moisture sources and thermodynamic controls on precipitation stable isotopes in Kunming, southwest China 昆明地区降水稳定同位素的双水汽源及其热力学控制

IF 4.4 2区地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES

Atmospheric Research

Pub Date : 2026-01-20 DOI: 10.1016/j.atmosres.2026.108786

Niranjan Adhikari , Lide Tian , Xuejie Wang , Zhangfei Ding , Di Wang , Zhongyin Cai , Yiliang Chen

Although Yunnan, located in southwestern China, is recognized as a transitional zone between the Indian Summer Monsoon and the East Asian Monsoon, the extent to which distinct moisture sources and associated transport pathways influence precipitation isotopic variability in this region remains poorly quantified. Here, we analyzed a four-and-a-half-year precipitation isotope dataset from Kunming and differentiated between precipitation sourced from the Bay of Bengal (BoB) and the South China Sea (SCS). We observe a strong seasonal δ¹⁸O contrast of 7.4‰ in BoB-sourced precipitation, which accounts for ∼61% of the moisture supply for Kunming precipitation. In contrast, SCS-sourced precipitation exhibits a weak seasonality of only 1.8‰ in δ¹⁸O. Our analysis indicates that seasonal changes of evaporative conditions in BoB source and upstream meteorology along its transport path produce this pattern, while relatively stable SCS source and transport conditions result in minimal seasonal variability. Simulation results demonstrate that SCS-sourced δ¹⁸O largely follows Rayleigh distillation, whereas BoB-sourced δ¹⁸O deviates from this simple model, indicating the influence of additional processes. We further find that the tropospheric temperature gradient is a key thermodynamic driver of precipitation δ¹⁸O, showing a persistent negative correlation across seasons and moisture sources. In addition, precipitation d-excess responds differently to the two moisture sources. D-excess in BoB-sourced precipitation partially reflects source-region and transport-path conditions, while SCS-sourced precipitation shows no such consistent relationships. Overall, this work quantifies the distinct isotopic fingerprints of these two major moisture sources to southwestern China, providing an advance for modeling regional water cycles and interpreting isotopic paleoclimate archives.

尽管位于中国西南部的云南被认为是印度夏季风和东亚季风之间的过渡带，但不同的水汽来源和相关的输送途径对该地区降水同位素变化的影响程度仍然缺乏量化。本文对昆明4年半降水同位素数据进行了分析，并对来自孟加拉湾（BoB）和南海（SCS）的降水进行了区分。bob源降水δ18O的季节性差异为7.4‰，约占昆明降水水分供应的61%。相比之下，南海源降水的δ18O季节性较弱，仅为1.8‰。分析表明，BoB源及其输送路径上游气象的蒸发条件的季节变化产生了这种模式，而相对稳定的南海源和输送条件导致了最小的季节变异。模拟结果表明，scs来源的δ18O在很大程度上遵循瑞利蒸馏，而bob来源的δ18O偏离了这一简单模型，表明附加过程的影响。对流层温度梯度是降水δ18O的关键热力学驱动因素，在不同季节和不同水汽来源之间呈现持续的负相关。此外，降水过量d对两种湿源的响应不同。b源降水的d过量部分反映了源区和运输路径条件，而scs源降水则没有这种一致的关系。总体而言，本研究量化了中国西南地区这两个主要水汽源的独特同位素指纹，为区域水循环模拟和同位素古气候档案解释提供了新的进展。

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引用次数: 0

Evaluation of WRF-simulated raindrop size distributions using disdrometer observations across eastern and southern China wrf模拟的中国东部和南部雨滴大小分布的分差仪观测评价

IF 4.4 2区地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES

Atmospheric Research

Pub Date : 2026-01-20 DOI: 10.1016/j.atmosres.2026.108789

Qiqi Yang , Lin Zhang , Wenqin Cai , Lei Wu , Yiheng Chen

This study evaluates the performance and associated uncertainties in Weather Research and Forecasting (WRF) model-simulated drop size distribution (DSD) using three microphysics schemes—Thompson aerosol-aware (Thompson), WDM6, and Morrison—across 138 rainfall events in eastern and southern China. Ground-based disdrometer observations were used to assess model performance under varying rain rates, precipitation types, and regional climates. Unlike prior single-event evaluations, this multi-station, multi-scheme analysis provides a comprehensive assessment of model biases and spread in key precipitation relationships, including the normalized intercept parameter versus mass-weighted mean diameter (

\log_{10} N_{w}

–

D_{m}

),

D_{m}

versus rain rate (

D_{m}

–R), radar reflectivity versus rain rate (Z–R), and rainfall kinetic energy density versus rain rate (

{KE}_{v}

–R). Results show that WRF simulations exhibited systematic overestimations of

D_{m}

and underestimations of

\log_{10} N_{w}

, which propagated to biases in Z and

{KE}_{v}

, with deviations up to 25% and 50%, respectively, under high rain rates. Among the schemes, Morrison outperformed other schemes for stratiform rain, while Thompson better captured convective events. Regional variability further modulated performance: Changchun's frontal systems and Xiamen's maritime climate induced distinct microphysical biases. These findings offer novel insights into microphysics scheme behavior and its cascading impacts on radar-based rainfall retrievals and hydrological modeling. The results highlight the need for integrating observational datasets and applying region-specific calibrations to improve DSD simulations in data-scarce regions.

本研究评估了天气研究与预报（WRF）模型的性能和相关的不确定性，使用三种微物理方案- Thompson气溶胶感知（Thompson）， WDM6和morrison -模拟中国东部和南部138个降雨事件的液滴大小分布（DSD）。利用地面分差仪观测来评估模式在不同降雨率、降水类型和区域气候下的性能。与之前的单事件评估不同，这次多站点、多方案分析提供了对关键降水关系的模型偏差和传播的全面评估，包括归一化截距参数与质量加权平均直径（log10Nw-Dm）、Dm与降雨率（Dm - r）、雷达反射率与降雨率（Z-R）以及降雨动能密度与降雨率（kv - r）。结果表明，WRF模拟系统地高估了Dm，低估了log10Nw，并在高降雨率下传播到Z和KEv的偏差，偏差分别高达25%和50%。在这些方案中，Morrison对层状雨的表现优于其他方案，而Thompson对对流事件的表现更好。区域变率进一步调节了其表现：长春锋面系统和厦门海洋性气候引起了明显的微物理偏差。这些发现为微物理方案行为及其对基于雷达的降雨检索和水文建模的级联影响提供了新的见解。结果表明，需要整合观测数据集并应用区域特定校准来改进数据稀缺地区的DSD模拟。

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引用次数: 0

Evaluation of the near-surface climatology of centennial-scale reanalyses for Greenland 格陵兰岛百年尺度再分析的近地表气候学评价

IF 4.4 2区地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES

Atmospheric Research

Pub Date : 2026-01-20 DOI: 10.1016/j.atmosres.2026.108793

Yaxiao Ma , Wuying Zhang

Understanding the past climate variability of Greenland is vital for contextualizing its current and future changes, a purpose for which centennial-scale reanalyses provide critical support. However, the performance of centennial-scale reanalyses over Greenland remains an open question, as previous assessments have primarily focused on the post-1979 period. Therefore, we evaluated the performance on different climate variables of the Twentieth Century Reanalysis version 3 (20CR v3; 1806–2015) and the European Centre for Medium Range Weather Forecasts fifth generation reanalysis (ERA5; 1940–2015) over Greenland, based on in-situ observations and ice core records. For 2-m temperature (T_2m), both reanalyses exhibited small cold biases in summer, though with a failure to capture variation patterns during this season. 20CR v3 showed dry biases in summer and wet biases in winter, while ERA5 consistently overestimated precipitation among all the seasons. Significant dry bias (<−2.5 mm) of 20CR v3 was found at southeastern coastal sites. We concluded that the elevation bias induced by the coarse resolution of 20CR v3 was one of the primary reasons for its cold and dry biases along the margin of the ice sheet. Notably, unlike ERA5, 20CR v3 failed to reproduce the observed increasing precipitation trend from 1940 to 2015 (−1.9 mm/dec vs 4.9 mm/dec, p > 0.05). Although 20CR v3 performed slightly inferior than ERA5, their consistent patterns, coupled with 20CR v3's robust performance, support the reliability of 20CR v3 for centennial-scale climate studies in Greenland.

了解格陵兰岛过去的气候变化对于确定其当前和未来变化的背景至关重要，百年尺度的再分析为这一目的提供了关键支持。然而，对格陵兰进行百年尺度再分析的结果仍然是一个悬而未决的问题，因为以前的评估主要集中在1979年以后的时期。因此，基于现场观测和冰芯记录，我们评估了格陵兰岛20世纪再分析版本3 （20CR v3; 1806-2015）和欧洲中期天气预报中心第五代再分析（ERA5; 1940-2015）在不同气候变量上的表现。对于2米温度（T2m），两种重新分析在夏季都显示出较小的寒冷偏差，尽管未能捕捉到该季节的变化模式。20CR v3在夏季偏干，冬季偏湿，而ERA5在所有季节中都一贯高估降水量。在东南沿海地区发现了显著的20CR v3干偏（<−2.5 mm）。我们认为，20CR v3的粗分辨率导致的高程偏差是造成冰盖边缘干冷偏差的主要原因之一。值得注意的是，与ERA5不同，20CR v3未能重现观测到的1940 - 2015年降水增加趋势（- 1.9 mm/dec vs . 4.9 mm/dec, p >； 0.05）。尽管20CR v3的表现略逊于ERA5，但它们的一致模式，加上20CR v3的强劲表现，支持了20CR v3在格陵兰岛百年尺度气候研究中的可靠性。

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引用次数: 0

Data assimilation of aerosol optical depth (AOD) in CMA-MESO/CUACE model to improve weather predictions in China CMA-MESO/CUACE模式中气溶胶光学深度（AOD）资料同化对中国天气预报的改进

IF 4.4 2区地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES

Atmospheric Research

Pub Date : 2026-01-19 DOI: 10.1016/j.atmosres.2026.108780

Jia Hong , Wenyuan Chang , Wei Han , Zhaorong Zhuang , Hao Wang , Lei Bi , Xueshun Shen

Aerosols play key role in cloud nucleation and atmospheric radiation processes, thus an accurate aerosol modeling is critical for numerical weather predictions. This study establishes an aerosol optical depth (AOD) 3D-Var data assimilation (DA) scheme for the CMA-MESO/CUACE weather prediction model, assimilates AOD retrievals derived from the Fengyun-4B (FY-4B) satellite, and evaluates the impacts of AOD DA on weather predictions through a month-long hindcast experiment. The AOD observation operator is built based on a look-up table, of which the aerosol optical properties (AOP) are computed for non-spherical dust with the invariant imbedding T-matrix method and for spherical anthropogenic aerosols with the Lorenz–Mie method, respectively. The month-long model results are evaluated using the AERONET measurements and ground-based weather observations across China. Results show a significant reduction of the bias of the AOD prediction by up to 0.2 by assimilating AOD retrievals. The improved AOD predictions further positively influence the modeling of the atmospheric thermal-dynamic structures. The Mean Absolute Error (MAE) of regional 2-m air temperature and 10-m wind speed predictions can be reduced by up to 0.7 K and 0.2 m s⁻¹, respectively. The benefits of AOD DA demonstrate the effectiveness of the developed AOD assimilation scheme and the necessity of incorporating satellite AOD data for improving weather predictions.

气溶胶在云成核和大气辐射过程中起着关键作用，因此准确的气溶胶模拟对数值天气预报至关重要。本文建立了CMA-MESO/CUACE天气预报模式的气溶胶光学深度（AOD） 3D-Var数据同化（DA）方案，同化了风云4b （FY-4B）卫星的AOD反演数据，并通过一个月的后播试验评估了AOD数据对天气预报的影响。建立了基于查找表的AOD观测算子，其中对非球形粉尘采用不变嵌入t矩阵法计算气溶胶光学性质（AOP），对球形人为气溶胶采用Lorenz-Mie法计算AOP。利用AERONET的测量数据和中国各地的地面天气观测对一个月的模式结果进行了评估。结果表明，通过吸收AOD检索，AOD预测偏差显著降低了0.2。改进后的AOD预测进一步对大气热力结构的模拟产生积极影响。区域2米气温和10米风速预报的平均绝对误差（MAE）可分别降低0.7 K和0.2 m s - 1。AOD数据的优势证明了发展的AOD同化方案的有效性和结合卫星AOD数据改善天气预报的必要性。

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引用次数: 0

Influence of the QBO vertical structure on the interannual variability of the Hadley circulation in autumn QBO垂直结构对秋季Hadley环流年际变化的影响

IF 4.4 2区地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES

Atmospheric Research

Pub Date : 2026-01-19 DOI: 10.1016/j.atmosres.2026.108792

Ying Wang , Jiali Luo , Juan Feng , Yan Xia , Fuhai Luo , Fei Xie

The Hadley circulation (HC) is the dominant meridional circulation in the tropics, and its interannual variability exerts a strong influence on the global climate system. While the El Niño-Southern Oscillation (ENSO) is a well-known tropospheric driver, the stratospheric Quasi-Biennial Oscillation (QBO) also contributes to tropical variability. However, the mechanisms through which the QBO modulates HC variability remain unclear. Using reanalysis data and CMIP6 model outputs, this study demonstrates that the vertical structure of the QBO plays a crucial role in modulating the interannual variability of the HC during autumn, particularly over the western Pacific. When the QBO vertical structure index (QBOVI) is greater than 0, a secondary circulation forms, characterized by equatorial ascent and midlatitude descent. This circulation is associated with a cold anomaly in the lower stratosphere, which reduces static stability near the tropopause and strengthens the local HC over the western Pacific. Conversely, when the QBOVI is less than 0, the static stability in the upper troposphere is enhanced, leading to a weakening of the HC. The evaluation of six selected high-top CMIP6 models shows that the models fail to capture the observed relationship between the QBO vertical structure and the HC. This limitation may arise from biases in simulating the link between HC intensity and static stability, as well as from difficulties in reproducing the QBO's regulation of the thermal structure near the tropopause. Improving model representations of this modulation could enhance the simulation and prediction of interannual HC variability.

哈德利环流（Hadley circulation， HC）是热带地区主要的经向环流，其年际变化对全球气候系统有重要影响。虽然厄尔Niño-Southern涛动（ENSO）是众所周知的对流层驱动因素，但平流层准两年一次涛动（QBO）也有助于热带变率。然而，QBO调节HC变异性的机制尚不清楚。利用再分析数据和CMIP6模式输出，本研究表明，QBO的垂直结构对秋季HC的年际变化起着至关重要的调节作用，特别是在西太平洋上空。当QBO垂直结构指数（QBOVI）大于0时，形成以赤道上升和中纬度下降为特征的二次环流。这种环流与平流层下层的冷异常有关，这降低了对流层顶附近的静态稳定性，加强了西太平洋上空的局部HC。相反，当QBOVI小于0时，对流层上层的静态稳定性增强，导致HC减弱。对选取的6个高顶CMIP6模式的评价表明，这些模式不能很好地反映QBO垂直结构与HC之间的关系。这种限制可能是由于在模拟HC强度和静态稳定性之间的联系时存在偏差，以及在再现QBO对对流层顶附近热结构的调节方面存在困难。改进这种调制的模式表示可以增强年际变率的模拟和预测。

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引用次数: 0

Influence of tropical cyclone ‘Biparjoy’ in exacerbating heatwaves and aerosol forcing over the Indian subcontinent 热带气旋“Biparjoy”对印度次大陆热浪和气溶胶强迫加剧的影响

IF 4.4 2区地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES

Atmospheric Research

Pub Date : 2026-01-19 DOI: 10.1016/j.atmosres.2026.108790

Shravani Banerjee , B. Padmakumari , M. Rajeevan

Tropical cyclones (TCs) are typically associated with intense convection and heavy rainfall; however, their broader influence on concurrent heatwave (HW) and air-quality extremes remains poorly understood. This study examines the complex interactions between cyclone dynamics, HWs, and aerosols during the prolonged TC Biparjoy in June 2023. While the cyclone produced widespread rainfall over western and northwestern India, persistent HWs prevailed across the central-east and peninsular regions. The cyclone's slow movement over northwestern India reinforced subsidence and high-pressure anomalies, leading to a 2–4 °C rise in surface temperatures and an expansion of the extent and intensity of HWs. Satellite observations revealed elevated aerosol loading up to 5 km over the HW-affected regions, dominated by absorbing dust and polluted dust aerosols. Analysis of dust transport and circulation patterns showed that strong westerly winds trailing the cyclone entrained coarse dust aerosols (>1.0 μm) from the Middle East and Central Asia, contributing to the widespread vertical enhancement of aerosols across central and peninsular India. Aerosol Direct Radiative Forcing (ADRF) analysis showed positive atmospheric forcing and negative surface forcing, implying a radiative imbalance that may have intensified near-surface heating through feedback mechanisms. The results highlight a compound TC-HW-Aerosol event, wherein cyclone-induced subsidence and dust transport jointly amplified regional heat extremes and atmospheric warming despite concurrent rainfall elsewhere.

热带气旋通常与强对流和强降雨有关；然而，它们对同期热浪（HW）和极端空气质量的更广泛影响仍知之甚少。本研究考察了2023年6月长时间TC Biparjoy期间气旋动力学、HWs和气溶胶之间的复杂相互作用。虽然气旋在印度西部和西北部带来了广泛的降雨，但持续的高压天气在中东部和半岛地区盛行。气旋在印度西北部的缓慢移动加强了下沉和高压异常，导致地表温度上升2-4°C，高压的范围和强度扩大。卫星观测显示，在受hw影响的地区，气溶胶负荷升高高达5公里，主要是吸收粉尘和被污染的粉尘气溶胶。沙尘输送和环流模式分析表明，强西风尾随气旋带来了来自中东和中亚的粗粒沙尘气溶胶（>1.0 μm），导致了印度中部和半岛气溶胶的广泛垂直增强。气溶胶直接辐射强迫（ADRF）分析显示大气正强迫和地表负强迫，表明辐射不平衡可能通过反馈机制加剧近地表加热。结果强调了一个复合tc - hw -气溶胶事件，其中气旋引起的沉降和沙尘运输共同放大了区域极端高温和大气变暖，尽管其他地方同时降雨。

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引用次数: 0

Different driving mechanisms during two consecutive flash heavy rainfalls over the Sichuan Basin in China: A case study 四川盆地两次连续暴雨的不同驱动机制

IF 4.4 2区地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES

Atmospheric Research

Pub Date : 2026-01-17 DOI: 10.1016/j.atmosres.2026.108787

Changqing Liu , Jie Cao , Chengzhi Deng , Furong Qian

Two flash heavy rainfalls (FHRs) with short and extremely persistent durations during July 4–6, 2017 consecutively attacked the Sichuan Basin in China with breaking historical precipitation records. Based on multi-source precipitation datasets including rain gauge stations, satellite-based products, and reanalysis datasets, the two FHRs are thoroughly investigated in this study. High resolution numerical simulations are performed to analyze and compare the key mechanisms and diurnal characteristics between the two FHRs, together with other analytical techniques such as Barnes filtering and ageostrophic wind diagnostic equation. It is found that the precipitating event was dominated by combined effects of a low-level jet (LLJ) and the southwest vortex. Similarities and differences between the two FHRs are analyzed and concluded from the perspective of their key driving mechanisms. During the first FHR with short durations, geostrophic winds progressively intensified, while low-level southeasterlies underwent topographic convergence and uplifted over the northwestern basin. Under the background of weak geostrophic wind variations, the ageostrophic wind vector in the second FHR with extremely persistent durations exhibited pronounced clockwise diurnal rotation. Enhanced nocturnal southerlies poured moisture convergence into the basin, driving nighttime precipitation intensification. Steep basin-edge topography strengthened boundary layer friction (BLF) and intensified easterly ageostrophic winds. This deflection steered the LLJ southeastward, effectively channeling moisture into the storm area. Post-dawn enhancement of boundary layer friction increased ageostrophic moisture flux, slowing the precipitation decay rate. The inertial oscillation of ageostrophic winds critically governed the nocturnal enhancement and daytime suppression of rainfall by modulating moisture transport phases. Additionally, the post-dawn increase in boundary layer friction altered spatiotemporal configurations between ageostrophic winds and the LLJ, forming a key factor in precipitation process asymmetry.

2017年7月4日至6日，中国四川盆地连续遭遇两次短时间极持续强降雨（FHRs），并打破历史降水记录。基于雨量站、卫星产品和再分析数据等多源降水数据集，对两种fhr进行了深入研究。通过高分辨率数值模拟，结合Barnes滤波和地转风诊断方程等分析技术，分析和比较了两种fhr的主要机制和日特征。结果表明，此次降水事件主要受低空急流（LLJ）和西南涡旋的共同作用。本文从二者的关键驱动机制出发，对二者的异同进行了分析和总结。在持续时间较短的第一次FHR期间，地转风逐渐增强，低层东南风在盆地西北部进行地形辐合并抬升。在弱地转风变化的背景下，极持续时间的第2次FHR地转风矢量表现出明显的顺时针日旋转。夜间增强的南风使水汽辐合进入盆地，推动夜间降水增强。陡峭的盆地边缘地形加强了边界层摩擦，增强了偏东地转风。这种偏转使LLJ向东南方向移动，有效地将湿气输送到风暴区。黎明后边界层摩擦的增强增加了地转湿通量，减缓了降水衰减速率。地转风的惯性振荡通过调节水汽输送阶段对夜间降雨的增强和白天降雨的抑制起关键作用。此外，黎明后边界层摩擦的增加改变了地转风与LLJ之间的时空配置，形成了降水过程不对称的关键因素。

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引用次数: 0

Impact of circulation and topography on the accumulation and dissipation of regional PM2.5 pollution in the Sichuan Basin, Southwestern China 环流和地形对四川盆地区域PM2.5污染积累消散的影响

IF 4.4 2区地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES

Atmospheric Research

Pub Date : 2026-01-17 DOI: 10.1016/j.atmosres.2026.108788

Xiaodong Wu , Yan Yu , Li Li , Xin Zheng , Yuelin Liu , Chang Yan , Guangming Shi , Fumo Yang

Regional PM_2.5 pollution frequently affects the Sichuan Basin in wintertime, posing significant risks to air quality and public health. In this study, six PM_2.5 pollution events (2016–2019) were analyzed by utilizing hourly PM_2.5 observations and reanalysis data to uncover the meteorological and topographic factors governing the accumulation and dissipation of these pollution events. During the accumulation phase, regional pollution developed in three patterns, with average increases in PM_2.5 concentrations of 59.88%, 49.23% and 88.87%, respectively. In the dissipation phase, two patterns were identified, occurring in 25% and 75% of the cases, respectively. Based on weather classification, background circulation characteristics were identified, including pollution-prone types (Type1, Type2), types with dual-effect (Type3, Type6), and clean types (Type5). During the accumulation phase, variations in the upper-level northeastern cold vortex and subtropical high affected mid-level troughs and ridges, while deep basin topography and mountain ranges hindered vertical and horizontal pollutant dispersion, resulting in three distinct accumulation patterns. In the dissipation phase, plateau subsidence and northern cold fronts acted as primary clearing mechanisms, with cold air intrusion most effective for pollutant removal. These results highlight the role of local meteorology in shaping pollution evolution and provide a foundation for improved regional forecasting and tailored control strategies.

区域性PM2.5污染在冬季频繁影响四川盆地，对空气质量和公众健康构成重大风险。本研究利用逐时PM2.5观测数据和再分析数据，分析了2016-2019年6次PM2.5污染事件，揭示了控制这些污染事件积累和消散的气象和地形因素。在累积阶段，区域污染呈3种模式发展，PM2.5浓度平均增幅分别为59.88%、49.23%和88.87%。在消散阶段，确定了两种模式，分别发生在25%和75%的病例中。根据天气分类，确定了背景环流特征，包括易污染类型（1、2型）、双重影响类型（3、6型）和清洁类型（5型）。在积累阶段，上层东北冷涡和副热带高压的变化影响了中层槽和脊，而深盆地地形和山脉则阻碍了污染物的垂直和水平扩散，形成了三种不同的积累模式。在消散阶段，高原沉降和北方冷锋是主要的清除机制，冷空气侵入对污染物的去除效果最好。这些结果突出了地方气象在影响污染演变中的作用，并为改进区域预报和量身定制的控制策略提供了基础。

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