Journal of Geophysical Research: Atmospheres最新文献_第8页

PlumeBed: A Multispectral Satellite Methane Plume Detector Enabled by Transfer Learning of a Multi-Source Hyperspectral Data Set PlumeBed：一个多光谱卫星甲烷羽流探测器，通过多源高光谱数据集的迁移学习实现

IF 3.8 2区地球科学

Journal of Geophysical Research: Atmospheres Pub Date : 2025-06-14 DOI: 10.1029/2024JD042795

Shutao Zhao, Yuzhong Zhang, Shuang Zhao, Ruosi Liang, Xinlu Wang

{"title":"PlumeBed: A Multispectral Satellite Methane Plume Detector Enabled by Transfer Learning of a Multi-Source Hyperspectral Data Set","authors":"Shutao Zhao, Yuzhong Zhang, Shuang Zhao, Ruosi Liang, Xinlu Wang","doi":"10.1029/2024JD042795","DOIUrl":"https://doi.org/10.1029/2024JD042795","url":null,"abstract":"Satellite-based detection of methane super-emitters in oil and gas fields is critical to inform methane mitigation actions. Multispectral satellite instruments such as Sentinel-2 offer frequent global coverage, making them suitable for monitoring methane super-emitters worldwide. However, automatically detecting methane emissions from the vast amount of noisy multispectral satellite data remains challenging. Recent studies have shown that deep learning is promising for this task, but it requires a large set of representative training samples, which are still limited. Hyperspectral data, particularly from airborne sources, are relatively mature and have accumulated some data sets, for example, from Carbon Mapper. Here, we develop PlumeBed, which consists of a synthetic image generation module and a domain adversarial neural network (DANN) module. The synthetic image generation module synthesizes training data by combining Carbon Mapper methane plumes and Sentinel-2 background noises. The DANN module is then trained to detect methane plumes from Sentinel-2 images. Evaluation against testing data sets compiled from previously reported super-emitters shows that the PlumeBed detector achieves an average macro-F1 score of 0.86, outperforming the conventional deep learning frameworks such as ResNet-50. We further apply PlumeBed to a previously unseen region in the Dauletabad gas field of Turkmenistan. This application unveils 14 methane super-emitters based on 1-year of Sentinel-2 data. Our study demonstrates that utilizing airborne hyperspectral data through transfer learning is promising to efficiently detect methane super-emitters in the global-coverage multispectral satellite data.","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":"130 12","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144289286","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

Fram Strait Marine Cold Air Outbreaks in CARRA and ERA5: Effects on Surface Turbulent Heat Fluxes and the Vertical Structure of the Troposphere 在CARRA和ERA5的Fram海峡海洋冷空气爆发：对地面湍流热通量和对流层垂直结构的影响

IF 3.8 2区地球科学

Journal of Geophysical Research: Atmospheres Pub Date : 2025-06-14 DOI: 10.1029/2024JD042908

Nils Slättberg, Sandro Dahlke, Marion Maturilli

{"title":"Fram Strait Marine Cold Air Outbreaks in CARRA and ERA5: Effects on Surface Turbulent Heat Fluxes and the Vertical Structure of the Troposphere","authors":"Nils Slättberg, Sandro Dahlke, Marion Maturilli","doi":"10.1029/2024JD042908","DOIUrl":"https://doi.org/10.1029/2024JD042908","url":null,"abstract":"Marine Cold Air Outbreaks (MCAOs) have a profound influence on atmospheric conditions and the surface-atmosphere heat exchange in Fram Strait and Svalbard. Comparing the global reanalysis ERA5 to its novel Arctic counterpart CARRA for November–March 1991–2020, we investigate the surface turbulent heat fluxes and the spatial characteristics associated with MCAO conditions. We find that the sensible heat flux from the surface to the atmosphere is substantially higher in CARRA while the latent heat flux is higher in ERA5. For sensible heat flux, the differences scale with the magnitude, leading to maximum disagreement over the ice-free ocean where the heat flux is high. Accounting for the varying heat flux magnitude over different surface types, we find the largest relative disagreement over sea ice. During MCAOs, negative anomalies in temperature and specific humidity are present throughout most of the troposphere in both reanalyses. Over the studied period, sea ice decline has caused positive trends in the surface-atmosphere potential temperature difference forming the basis of the MCAO index, leading to higher heat fluxes around much of Svalbard. In ice-free Fram Strait however, both reanalyses show negative trends in the MCAO index and the heat fluxes in January, when the increase in potential temperature is larger at 850 hPa than at the surface. Finally, large differences between two individual MCAO cases are found in reanalysis heat flux variability and radiosonde-derived atmospheric conditions over Svalbard.","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":"130 12","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2024JD042908","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144289233","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

Assessing Climate Change Impacts on the March 2024 Compound Floods and Saharan Dust Outbreak in Europe 评估气候变化对2024年3月欧洲复合洪水和撒哈拉沙尘爆发的影响

IF 3.8 2区地球科学

Journal of Geophysical Research: Atmospheres Pub Date : 2025-06-14 DOI: 10.1029/2024JD042218

Flavio Pons, Tommaso Alberti, Gabriele Messori, François Dulac, Davide Faranda

引用次数: 0

A Novel Approach for Sea Surface Wind Field Reconstruction Using Sparse Scatterometer Data Based on Physics-Informed Neutral Network 基于物理信息中立网络的稀疏散射计数据重建海面风场新方法

IF 3.8 2区地球科学

Journal of Geophysical Research: Atmospheres Pub Date : 2025-06-13 DOI: 10.1029/2025JD043772

Ran Bo, Huadong Du, Zeming Zhou, Pinglv Yang, Xiaofeng Zhao, Qian Li, Zengliang Zang

{"title":"A Novel Approach for Sea Surface Wind Field Reconstruction Using Sparse Scatterometer Data Based on Physics-Informed Neutral Network","authors":"Ran Bo, Huadong Du, Zeming Zhou, Pinglv Yang, Xiaofeng Zhao, Qian Li, Zengliang Zang","doi":"10.1029/2025JD043772","DOIUrl":"https://doi.org/10.1029/2025JD043772","url":null,"abstract":"Satellite-based research on global sea surface winds is crucial for understanding and monitoring dynamic air-sea interface processes, driving the need for reliable assessments and forecasts. Achieving these objectives requires accurate reconstruction of wind speeds and wind directions that assimilate real-time observations, but current methods used for such reconstructions remain computationally expensive and challenging to solve highly nonlinear equations. By selecting multiple regions in the Pacific Ocean as case studies, we explore the fusion of sparse scatterometer observations from different satellites with physics-informed neural networks (PINNs) to reconstruct large-scale sea surface wind fields, effectively integrating observations and filling data gaps. The result demonstrates that PINNs can efficiently reconstruct full realistic wind fields from sparse data at a low computation cost. Moreover, we propose a novel loss function that can preserve fine-scale details while capturing the key features of the wind field. Evaluation against reference data sets, including buoy measurements, ERA5, and cross-calibrated multiplatform (CCMP) wind speed and direction, highlights the accuracy and robustness of the proposed method. Compared to the reanalysis data of ERA5 and CCMP, the wind field reconstructed by the PINN closely aligns with the observation. These findings underscore the potential of the PINN technique as an alternative, computationally efficient approach for operational sea surface wind reconstruction.","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":"130 12","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144281359","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

Multidecadal Variability in Atmospheric Dust Preserved in an Ice Core From the Southern Slopes of the Himalayas 喜马拉雅山南坡冰芯中保存的大气尘埃的多年代际变化

IF 3.8 2区地球科学

Journal of Geophysical Research: Atmospheres Pub Date : 2025-06-12 DOI: 10.1029/2025JD043492

Nao Esashi, Akane Tsushima, Sumito Matoba, Yoshinori Iizuka, Ryu Uemura, Rijan B. Kayastha, Koji Fujita

{"title":"Multidecadal Variability in Atmospheric Dust Preserved in an Ice Core From the Southern Slopes of the Himalayas","authors":"Nao Esashi, Akane Tsushima, Sumito Matoba, Yoshinori Iizuka, Ryu Uemura, Rijan B. Kayastha, Koji Fujita","doi":"10.1029/2025JD043492","DOIUrl":"https://doi.org/10.1029/2025JD043492","url":null,"abstract":"Ice cores from the Himalayan region, downwind from vast arid and densely populated areas, are important in revealing long-term dust variability and the driving factors behind such variability. However, logistical challenges in reaching the region have hindered the retrieval of long-term dust records from the southern side of the Himalayas. This study presents a 145-year record of atmospheric dust from an 81.2-m ice core drilled in the Trambau (TB) glacier, a south-facing glacier in the Nepal Himalaya, covering 1875–2019 CE. Comparison of dust records from the northern and southern slopes of the Himalayas indicates that the ice core from the southern slopes has preserved higher dust concentrations and larger particle sizes than records from the northern slopes. Furthermore, the TB core record shows 50- to 70-year multidecadal variability, positively correlated with the Atlantic Multidecadal Oscillation (AMO). Based on correlation and composite analyses using ERA5 reanalysis data, AMO phases have been linked with surface wetness/dryness in dust source regions in the Middle East and Southwest Asia, likely contributing to variations in dust loading at the TB core site.","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":"130 12","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2025JD043492","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144264559","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

How Do Planetary Boundary Layer Schemes Perform in PM2.5-O3 Composite Pollution in the Beijing-Tianjin-Hebei (BTH)? An In-Depth Mechanism Analysis From the Underlying Code 行星边界层方案对京津冀地区PM2.5-O3复合污染的影响从底层代码进行深入的机制分析

IF 3.8 2区地球科学

Journal of Geophysical Research: Atmospheres Pub Date : 2025-06-12 DOI: 10.1029/2025JD043459

Wenxing Jia, Xiaoye Zhang, Yi Lin, Deying Wang, Hong Wang, Yaqiang Wang

{"title":"How Do Planetary Boundary Layer Schemes Perform in PM2.5-O3 Composite Pollution in the Beijing-Tianjin-Hebei (BTH)? An In-Depth Mechanism Analysis From the Underlying Code","authors":"Wenxing Jia, Xiaoye Zhang, Yi Lin, Deying Wang, Hong Wang, Yaqiang Wang","doi":"10.1029/2025JD043459","DOIUrl":"https://doi.org/10.1029/2025JD043459","url":null,"abstract":"Parameterization schemes undergo continuous updates, with most refinements documented in code implementations, necessitating in-depth code analysis for evaluation. Focusing on PM2.5-O3 composite pollution in the Beijing-Tianjin-Hebei region, 10 planetary boundary layer (PBL) schemes were evaluated for their simulation performance. The 2-m temperature (T2) demonstrates daytime dependence on temperature gradient and transport coefficient, shifting to surface temperature dominance at night. Saturated mixing ratio predominantly governs 2-m relative humidity (RH2) variations, while 10-m wind speed (WS10) derives from the first-level wind speed. Vertical profile comparisons reveal degraded simulation accuracy at lower levels, attributed to human activities’ influences within the PBL. The total energy-mass flux scheme exhibited distinct deviations due to failure to recognize the existence of shallow cumulus, consequently suppressing vertical mixing. Turbulent diffusion coefficient (K) discrepancies in nonlocal closure schemes primarily stem from PBL height (PBLH) variations, whereas local closure schemes show mixing length dominance (∼63%). Dissipation rate considerations exert stronger impacts at lower levels. For hybrid schemes, K calculated by Monin-Obukhov similarity theory shows enhanced magnitudes during daytime. Statistical analysis indicates the Mellor-Yamada-Janjić scheme's minor T2 deficiencies become insignificant when weighed against its superior vertical profiles of T, RH, and WS10. These insights offer critical references for PBL scheme optimization.","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":"130 12","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2025JD043459","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144264579","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

Ozone Sensitivity in the Yangtze River Delta Region: A Reanalysis With Enhanced Ozone Forecasts via Multi-Source Data Assimilation 长江三角洲地区臭氧敏感性：多源同化增强臭氧预报的再分析

IF 3.8 2区地球科学

Journal of Geophysical Research: Atmospheres Pub Date : 2025-06-12 DOI: 10.1029/2024JD042958

Tian Han, Jing Zhang, Yunfei Che, Xiaomin Hu, Xiaoqing Deng, Yuqing Liu, Yifan Wang, Yiwen Lang

{"title":"Ozone Sensitivity in the Yangtze River Delta Region: A Reanalysis With Enhanced Ozone Forecasts via Multi-Source Data Assimilation","authors":"Tian Han, Jing Zhang, Yunfei Che, Xiaomin Hu, Xiaoqing Deng, Yuqing Liu, Yifan Wang, Yiwen Lang","doi":"10.1029/2024JD042958","DOIUrl":"https://doi.org/10.1029/2024JD042958","url":null,"abstract":"Distinguishing ozone-sensitive areas is crucial for controlling ozone pollution, and model simulations play a key role in distinguishing ozone sensitive areas. WRF-Chem is one of the state-of-the-art air quality models currently available, but challenges still exist in its simulation of ozone pollution, which are partly due to its strong dependence on the accuracy of initial conditions, boundary conditions, and emissions. To improve the accuracy of ozone predictions, this study assimilated ground-based monitoring and satellite data to improve initial and boundary conditions during a typical ozone pollution episode in YRD region. As a result, compared with station observations, the R and RMSE of model simulation are greatly improved. Additionally, the emission inventory during this event was inverted and then used to drive the model to re-simulate this event, and the simulation results are improved. Furthermore, based on the new emissions, we conducted three emission reduction scenario simulations to distinguish ozone sensitivity region. Ozone formation was in a VOC-limited regime in south Jiangsu during the study period. For north Zhejiang, transitional and NOx-limited regimes occurred alternately. It is worth noting that the ozone sensitivity regimes derived from the original emission inventory were not consistent with those obtained from the improved emission inventory. A comparison with satellite-derived OMI HCHO/NO2 data confirmed that the conclusions based on the updated emission inventory were more consistent. This study highlights that relying on current emission data for policy formulation may result in strategic errors.","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":"130 12","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144264558","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

Insights Into the Evolution Behavior and Hygroscopicity of Black Carbon-Containing Particles Based on Observations of Their Chemical Compositions in Beijing's Autumn 基于北京秋季含黑碳颗粒化学成分观测的演化行为和吸湿性

IF 3.8 2区地球科学

Journal of Geophysical Research: Atmospheres Pub Date : 2025-06-12 DOI: 10.1029/2024JD043180

Linghan Zeng, Shuya Hu, Wenxu Fang, Zheng Chen, Yu Xie, Shiyi Chen, Min Hu

{"title":"Insights Into the Evolution Behavior and Hygroscopicity of Black Carbon-Containing Particles Based on Observations of Their Chemical Compositions in Beijing's Autumn","authors":"Linghan Zeng, Shuya Hu, Wenxu Fang, Zheng Chen, Yu Xie, Shiyi Chen, Min Hu","doi":"10.1029/2024JD043180","DOIUrl":"https://doi.org/10.1029/2024JD043180","url":null,"abstract":"Black carbon-containing particles (BCc) are key short-lived climate forcers, exerting strong light absorption that influences climate. Their atmospheric behavior evolves during aging, necessitating chemical characterization to elucidate their environmental and climatic impacts. Despite this, detailed studies of BCc compositions and evolution under current atmospheric conditions remain scarce. In this study, we deployed a soot particle aerosol mass spectrometer (SP-AMS) alongside advanced instrumentation during a month-long field campaign in Beijing in autumn 2022 to examine the chemical compositions and evolution of BCc. Our results reveal a strong link between BCc coatings and air pollution levels, with organic compounds and nitrate as the predominant coating materials. Nitrate displayed pronounced temperature sensitivity and uneven distribution between BCc and other sub-micron particles. During high-ozone pollution episodes, secondary organic aerosols dominated the organic fraction of BCc coatings, whereas in lower-ozone conditions, secondary contributions elevated with increasing air pollution, likely driven by aqueous-phase reactions. Hygroscopicity estimates for BCc and bulk PM1, derived from the Zdanovskii−Stokes−Robinson mixing rule, consistently diverged, with differences diminishing as coatings thickened. These findings provide critical insights into the atmospheric fate of BCc, underscoring the pivotal role of chemical characterization in understanding their behavior and broader implications for climate and air quality.","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":"130 12","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144264557","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

Overestimation of Interannual Temperature Variability Over China by CMIP6 Simulations: The Role of Snow Cover and Cloud Representation CMIP6模拟对中国气温年际变化的高估：积雪和云的作用

IF 3.8 2区地球科学

Journal of Geophysical Research: Atmospheres Pub Date : 2025-06-11 DOI: 10.1029/2025JD043551

Liquan Wang, Zhaochen Liu, Dabang Jiang

{"title":"Overestimation of Interannual Temperature Variability Over China by CMIP6 Simulations: The Role of Snow Cover and Cloud Representation","authors":"Liquan Wang, Zhaochen Liu, Dabang Jiang","doi":"10.1029/2025JD043551","DOIUrl":"https://doi.org/10.1029/2025JD043551","url":null,"abstract":"Climate models have overestimated the interannual variability in surface air temperature over China for decades. This issue has been widely discussed but without a clear attribution. Using the latest sixth phase of the Coupled Model Intercomparison Project models, we investigate the relevant physical processes contributing to the greater simulated temperature variability in China based on the atmospheric energy budget. The results show that a strong overestimation exists in Northwest, Southwest, North, Central, and East China, which is dominated by the poor reproduction of snow cover and cloud. Exaggerated snow cover variability enhances the fluctuations of the clear-sky shortwave radiation reflected back to the top-of-the-atmosphere, inducing positive biases in the Tibetan Plateau, North, Central, and East China. This snow-albedo feedback also explains why the overvalued temperature variability in winter and spring is larger than that in summer and autumn. The shortwave cloud radiative forcing is also responsible for the overvalued temperature fluctuations in North and Northwest China, as well as south of 30°N in Central and East China. The contributions of snow-albedo feedback and shortwave cloud radiative forcing vary with seasons and regions. Additionally, the overvalued tropospheric temperature variability leads to the temperature variability overestimation in Northwest China.","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":"130 12","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144264524","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

Intensified Tibetan Plateau Spring Warming Exacerbate Summer Extreme Precipitation in Central Asia Since the 2000s 2000年以来青藏高原春季增温加剧了中亚夏季极端降水

IF 3.8 2区地球科学

Journal of Geophysical Research: Atmospheres Pub Date : 2025-06-10 DOI: 10.1029/2024JD043074

Qianrong Ma, Lingzhi Zhang, Rui Hu, Hao Wu, Pengcheng Yan, Yi Chang, Guolin Feng

{"title":"Intensified Tibetan Plateau Spring Warming Exacerbate Summer Extreme Precipitation in Central Asia Since the 2000s","authors":"Qianrong Ma, Lingzhi Zhang, Rui Hu, Hao Wu, Pengcheng Yan, Yi Chang, Guolin Feng","doi":"10.1029/2024JD043074","DOIUrl":"https://doi.org/10.1029/2024JD043074","url":null,"abstract":"Spring warming trends over the Tibetan Plateau (TP) have accelerated, coinciding with a significant increase in summer extreme precipitation (June–July) in Central Asia (EPCA), after 2000. This study attempts to throw detailed light on how spring TP warming influences EPCA, with a particular focus on the role of the Indian summer monsoon (ISM) as an intermediary. Warming in central TP since 2000 has altered meridional temperature gradients at the surface and troposphere, shifting the East Asian jet northward and resulting an anomalous anticyclone over the TP and a cyclonic anomaly over western TP. Concurrently, the weakening of the Middle East jet has triggered a cyclonic anomaly over the Arabian Sea and Indian Peninsula (IP), enhancing moisture convergence and increasing precipitation over northeastern IP. The associated diabatic heating has further intensified the cyclonic anomaly over central IP, which persists into June and promotes northward moisture transportation. Combined with the anomalous cyclone over western TP, these changes have contributed to the observed increase in EPCA. In July, the cyclonic anomaly over central IP, located further west, facilitates eastward moisture transport across northern IP. These anomalies, situated west of the monsoon trough, reflect a seasonal westward shift of the ISM and a strengthening of the South Asian High (SAH). This shift drives the development of cyclonic anomalies over eastern Central Asia and anticyclonic anomalies over western Central Asia. Meanwhile, increased low-latitude moisture transportation to the central-western TP and Central Asia further enhances precipitation in central TP, promoting an increase in EPCA.","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":"130 12","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144255829","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