Atmospheric Science Letters最新文献_第4页

IF 2 4区地球科学

Atmospheric Science Letters Pub Date : 2026-05-15

引用次数: 0

Three-Dimensional Structure of Cold-Air Damming in the Kanto Plain, Japan, Revealed by Multiple-Site Radiosonde Observations 多站点无线电探空观测揭示的日本关东平原冷空气筑坝的三维结构

IF 2 4区地球科学

Atmospheric Science Letters Pub Date : 2026-05-15 DOI: 10.1002/asl2.70027

Kazumasa Sengoku, Hiroyuki Kusaka

{"title":"Three-Dimensional Structure of Cold-Air Damming in the Kanto Plain, Japan, Revealed by Multiple-Site Radiosonde Observations","authors":"Kazumasa Sengoku, Hiroyuki Kusaka","doi":"10.1002/asl2.70027","DOIUrl":"https://doi.org/10.1002/asl2.70027","url":null,"abstract":"In winter, cold-air damming (CAD) in Japan's Kanto Plain often results in snowfall, which can seriously affect infrastructure. This study investigated the three-dimensional structure of CAD during a typical snowfall event on 4 March 2025 based on independently conducted simultaneous multiple-site radiosonde observations, together with radiosonde observations from the Japan Meteorological Agency and surface observations. The observations revealed a distinct three-layer structure: the inland cold air with a depth of 500–1000 m over the plain, an overrunning northeasterly to easterly flow, and warm air intruding from the south to southeast. This structure is consistent with the typical CAD observed east of the Appalachian Mountains of the eastern United States, which is characterised by warm air overrunning a cold-air dome. An examination of the formation process further suggests that this CAD likely formed within a shallow low-level layer owing to diabatic cooling associated with precipitation. This paper presents an observation-based case study that documents the three-dimensional structure of CAD, as well as an aspect of its temporal evolution over the relatively understudied Kanto Plain.","PeriodicalId":50734,"journal":{"name":"Atmospheric Science Letters","volume":"27 5","pages":""},"PeriodicalIF":2.0,"publicationDate":"2026-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/asl2.70027","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148048460","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}

引用次数: 0

Satellite-Based Probable Maximum Precipitation Estimation and Spatiotemporal Analysis of Rainfall in Nepal Himalayas: Implications for Hydroclimatic Disaster Management 尼泊尔喜马拉雅地区基于卫星的可能最大降水估算和降水时空分析：对水文气候灾害管理的影响

IF 2 4区地球科学

Atmospheric Science Letters Pub Date : 2026-05-10 DOI: 10.1002/asl2.70031

Sudip Pandey, Konduru Rakesh Teja, Shivaang Sinha, Ram Avtar

{"title":"Satellite-Based Probable Maximum Precipitation Estimation and Spatiotemporal Analysis of Rainfall in Nepal Himalayas: Implications for Hydroclimatic Disaster Management","authors":"Sudip Pandey, Konduru Rakesh Teja, Shivaang Sinha, Ram Avtar","doi":"10.1002/asl2.70031","DOIUrl":"https://doi.org/10.1002/asl2.70031","url":null,"abstract":"Probable maximum precipitation (PMP) is crucial for water-related disaster management, especially in regions like Nepal, where extreme weather poses significant risks. Despite its importance, PMP studies in Nepal remain limited. This study quantifies PMP using Hershfield's method, applied to daily precipitation data at 0.05° resolution from CHIRPS v2.0 (1992–2022), compared against in situ observations (correlation coefficient = 0.80, index of agreement = 0.68, RMSE = 4.56 mm). Intense rainfall (> 70 mm/day) is prevalent in central, eastern, and lower western Nepal from June to September, with an increasing trend in pre-monsoon (March–May) rainfall, suggesting a potential shift toward an earlier monsoon onset. In contrast, post-monsoon (October–November) rainfall is declining, particularly in western Nepal. The trend in extreme precipitation (total precipitation on heaviest 1% of days) shows a statistically significant increase of 16 mm/year (p < 0.05) across the eastern and Churia range. In contrast, the western and northern regions experienced a significant decline of approximately 14 mm/year (p < 0.05). PMP values peak at around 920 mm/day in certain grids over western Nepal and 540 mm/day in the central Himalayas and mid-hills, highlighting serious hydrological risks such as floods, landslides, and dry spells. The findings underscore the urgency of improved early warning systems, resilient infrastructure, and adaptive climate policies.","PeriodicalId":50734,"journal":{"name":"Atmospheric Science Letters","volume":"27 5","pages":""},"PeriodicalIF":2.0,"publicationDate":"2026-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/asl2.70031","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148047546","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}

引用次数: 0

IF 2 4区地球科学

Atmospheric Science Letters Pub Date : 2026-05-10

引用次数: 0

IF 2 4区地球科学

Atmospheric Science Letters Pub Date : 2026-04-29

引用次数: 0

Extreme High Temperatures in the Indochina Peninsula and Their Association With Enhanced Convection in the Horn of Africa and Arabian Peninsula During Spring 2023 2023年春季印度支那半岛极端高温及其与非洲之角和阿拉伯半岛对流增强的关系

IF 2 4区地球科学

Atmospheric Science Letters Pub Date : 2026-04-29 DOI: 10.1002/asl2.70026

Baochao Liu, Yue Fang, Shuangwen Sun, Lin Liu, Wee Cheah

{"title":"Extreme High Temperatures in the Indochina Peninsula and Their Association With Enhanced Convection in the Horn of Africa and Arabian Peninsula During Spring 2023","authors":"Baochao Liu, Yue Fang, Shuangwen Sun, Lin Liu, Wee Cheah","doi":"10.1002/asl2.70026","DOIUrl":"https://doi.org/10.1002/asl2.70026","url":null,"abstract":"This study investigates the mechanisms underlying persistent extreme high temperatures over the Indochina Peninsula (ICP) in spring 2023, which occurred following a La Niña winter, contrasting with previous events that typically followed El Niño winters. Analysis reveals that a persistent “heat dome” pattern over the ICP during spring 2023 created favorable conditions for extreme heat. Wave activity flux analysis and linear baroclinic model simulations consistently suggest that the enhanced convection in the Horn of Africa and Arabian Peninsula play a significant contributing role in the heat dome via Rossby waves propagation. Specifically, the energy dispersion of Rossby waves contributes to the direct formation of an anomalous anticyclone in the upper troposphere over the ICP. Concurrently, the westerly flow on the southern flank of the anomalous cyclone over South Asia—part of the same wave train—facilitates strong upper-level convergence and subsidence over the ICP, promoting the establishment and maintenance of the heat dome.","PeriodicalId":50734,"journal":{"name":"Atmospheric Science Letters","volume":"27 5","pages":""},"PeriodicalIF":2.0,"publicationDate":"2026-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/asl2.70026","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148050439","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}

引用次数: 0

IF 2 4区地球科学

Atmospheric Science Letters Pub Date : 2026-04-28

引用次数: 0

Linkage Between Late-Summer Heat Waves Over Northeastern Siberia and Subsequent SST Cooling in the Western North Pacific 西伯利亚东北部夏末热浪与随后北太平洋西部海温冷却之间的联系

IF 2 4区地球科学

Atmospheric Science Letters Pub Date : 2026-04-28 DOI: 10.1002/asl2.70030

Xiling Zhou, Tomonori Sato, Shixue Li, Youichi Tanimoto

{"title":"Linkage Between Late-Summer Heat Waves Over Northeastern Siberia and Subsequent SST Cooling in the Western North Pacific","authors":"Xiling Zhou, Tomonori Sato, Shixue Li, Youichi Tanimoto","doi":"10.1002/asl2.70030","DOIUrl":"https://doi.org/10.1002/asl2.70030","url":null,"abstract":"Sea surface temperature (SST) in the western North Pacific (WNP) strongly affects the regional marine ecosystem and modulates East Asian weather. Although the mechanisms of SST variability in the WNP have been extensively examined, it remains unclear how it is influenced by remote forcing from high-latitude regions. Using reanalysis datasets spanning 1979–2024, this study examined the linkage between the summer atmospheric circulation over northeastern Siberia (NES) and autumn SST variability in the WNP and elucidated the underlying influencing processes. Results revealed that anomalous high pressure over NES in August, concurrent with frequent heat waves, is typically followed by colder autumn SST in the WNP. The ocean cooling is modulated by a low-pressure system over the WNP, which reduces insolation through increased cloud cover and enhances evaporation via dry air advection. Together, these processes result in net surface heat loss, thereby contributing to subsequent SST cooling. This cooling, plausibly sustained by ocean thermal inertia, persists until November. This linkage, observed only following August heat waves over NES, is facilitated by the oceanic thermal structure characterized by a shallow mixed layer, which enhances the sensitivity of SST to surface heat loss. These findings suggest that the late-summer atmospheric circulation over NES might be helpful in predicting autumn SST variability in the WNP and provide new insights into the connection between high-latitude heat extremes and midlatitude SST variability.","PeriodicalId":50734,"journal":{"name":"Atmospheric Science Letters","volume":"27 5","pages":""},"PeriodicalIF":2.0,"publicationDate":"2026-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/asl2.70030","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148050224","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}

引用次数: 0

IF 2 4区地球科学

Atmospheric Science Letters Pub Date : 2026-04-28

引用次数: 0

IF 2 4区地球科学

Atmospheric Science Letters Pub Date : 2026-04-21

引用次数: 0