Atmospheric Science Letters最新文献

Attempt at Ship-Based Observations of Oceanic Drop Size Distributions Over the Tropical Warm Pool 热带暖池上空海洋水滴大小分布的船载观测尝试

IF 2 4区地球科学

Atmospheric Science Letters Pub Date : 2025-10-02 DOI: 10.1002/asl.1320

Masaki Katsumata, Biao Geng

引用次数: 0

Morphological Characteristics of Mesoscale Convective Systems Formed in the Middle Reaches of the Yangtze River Basin and Their Evolution Patterns 长江中游形成的中尺度对流系统形态特征及其演变模式

IF 2 4区地球科学

Atmospheric Science Letters Pub Date : 2025-10-02 DOI: 10.1002/asl.1322

Yanan Fu, Yuanchun Zhang, Huijie Wang, Jianhua Sun

{"title":"Morphological Characteristics of Mesoscale Convective Systems Formed in the Middle Reaches of the Yangtze River Basin and Their Evolution Patterns","authors":"Yanan Fu, Yuanchun Zhang, Huijie Wang, Jianhua Sun","doi":"10.1002/asl.1322","DOIUrl":"https://doi.org/10.1002/asl.1322","url":null,"abstract":"Based on the extent and eccentricity characteristics, mesoscale convective systems (MCSs) formed in the middle reaches of the Yangtze River Basin were classified into six subtypes: large circular (LC), large elongated (LE), medium circular (MC), medium elongated (ME), small circular (SC), and small elongated (SE). The lifespans of all L-scale and most M-scale MCSs exceed 6 h, whereas the majority of S-scale MCSs last less than 6 h. The cold cloud coverage frequency for E-type MCSs exhibits relative uniformity, with high-frequency regions located south of the Yangtze River. In contrast, C-type MCSs display a more scattered high-frequency distribution with higher maxima. E-type MCSs predominantly retain an elongated shape throughout their life cycles. Additionally, as the area of LE and ME MCSs expands, their eccentricity progressively decreases, leading to a greater inclination towards the east–west direction. For C-type MCSs, they maintain a circular shape for less than half of their duration but tend to adopt an elongated shape during the development or dissipation stages. These findings provide a foundation for further investigation into the formation mechanisms and associated mesoscale systems of MCSs, which could enhance the prediction accuracy of the location and intensity of severe weather events linked to different types of MCSs.","PeriodicalId":50734,"journal":{"name":"Atmospheric Science Letters","volume":"26 10","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://rmets.onlinelibrary.wiley.com/doi/epdf/10.1002/asl.1322","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145204771","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

Sensitivity of the Representation of Polar Lows to Typical Climate Model Resolutions 极地低气压对典型气候模式分辨率的敏感性

IF 2 4区地球科学

Atmospheric Science Letters Pub Date : 2025-09-15 DOI: 10.1002/asl.1319

Marta Moreno-Ibáñez, John J. Cassano, Suzanne L. Gray, Mark Seefeldt

{"title":"Sensitivity of the Representation of Polar Lows to Typical Climate Model Resolutions","authors":"Marta Moreno-Ibáñez, John J. Cassano, Suzanne L. Gray, Mark Seefeldt","doi":"10.1002/asl.1319","DOIUrl":"10.1002/asl.1319","url":null,"abstract":"Polar lows (PLs) are intense maritime mesoscale cyclones that often form during marine cold air outbreaks. The objective of this study is to determine the atmospheric model horizontal resolution needed to correctly represent PLs for climate modelling. Three simulations have been conducted with the Weather Research and Forecasting (WRF) model using grid spacings of 50, 25 and 12.5 km. PLs have been tracked using a combination of objective and subjective tracking methods. The number of PLs detected in each simulation increases, and their average equivalent radius decreases, as the model resolution increases. A comparison against three PL track climatologies shows that the hit rate increases with increasing resolution of the atmospheric model. The lifetime maxima of the area-maximum 10-m wind speed and area-average surface sensible heat fluxes associated with PLs are on average 12% and 20% larger, respectively, in the higher-resolution simulations than in the lower-resolution one. The lifetime maximum of the area-maximum 1-h accumulated precipitation is 67% and 133% larger in the 25- and 12.5-km simulations, respectively, than in the lower-resolution one. We conclude that a better representation of PLs can be obtained by increasing the resolution of atmospheric models from 50 to 25 km, but further increasing the resolution to 12.5 km will not result in a substantial improvement.","PeriodicalId":50734,"journal":{"name":"Atmospheric Science Letters","volume":"26 9","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://rmets.onlinelibrary.wiley.com/doi/epdf/10.1002/asl.1319","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145101133","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

What Are the Most Important Contributors to Arctic Precipitation—When, Where, and How? 什么是北极降水最重要的贡献者——何时、何地、如何？

IF 2 4区地球科学

Atmospheric Science Letters Pub Date : 2025-09-14 DOI: 10.1002/asl.1317

Melanie Lauer, Annette Rinke, Susanne Crewell

{"title":"What Are the Most Important Contributors to Arctic Precipitation—When, Where, and How?","authors":"Melanie Lauer, Annette Rinke, Susanne Crewell","doi":"10.1002/asl.1317","DOIUrl":"10.1002/asl.1317","url":null,"abstract":"The Arctic climate system is experiencing large changes associated with global warming. Precipitation is a crucial factor linking the atmosphere with other climate compartments, for example, ocean and cryosphere. Using atmospheric reanalysis (ERA5) we assess the role of atmospheric weather systems, that is, atmospheric rivers, cyclones, and fronts. When: Averaged over the whole Arctic (> 70° N), a strong seasonal cycle exists with twice as much precipitation in summer than in winter when frozen precipitation is mainly brought by cyclones. In summer, the highest total precipitation amounts are rather equally contributed by all weather systems. Where: In winter, the Arctic North Atlantic region experiences by far the highest precipitation amounts, whereas in summer precipitation is more evenly distributed over the whole Arctic. How: Overall, cyclones are the most important contributor to precipitation. The highest precipitation intensity occurs when atmospheric rivers, cyclones, and fronts coincide, whereas the lowest precipitation rates occur when precipitation cannot be attributed to any of these weather systems. This residual makes up almost half of the annual snowfall, most of it in the central Arctic, and 25% of rainfall. Marine Cold Air Outbreaks can explain part of the residual. The amount and drivers for light “trace” precipitation requires further investigation.","PeriodicalId":50734,"journal":{"name":"Atmospheric Science Letters","volume":"26 9","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://rmets.onlinelibrary.wiley.com/doi/epdf/10.1002/asl.1317","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145062632","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

Role of Intraseasonal Oscillation in Linking the Stepwise Onset of Summer Monsoon in the Northern Indian Ocean 季节内振荡在连接北印度洋夏季风逐步爆发中的作用

IF 2 4区地球科学

Atmospheric Science Letters Pub Date : 2025-09-02 DOI: 10.1002/asl.1313

Kuiping Li, Qin He, Yang Yang

{"title":"Role of Intraseasonal Oscillation in Linking the Stepwise Onset of Summer Monsoon in the Northern Indian Ocean","authors":"Kuiping Li, Qin He, Yang Yang","doi":"10.1002/asl.1313","DOIUrl":"10.1002/asl.1313","url":null,"abstract":"The summer monsoon onset in the northern Indian Ocean is crucial for the densely populated South Asia, as it ends the pre-monsoon heatwave and kicks off the rainy agricultural season. Climatologically, this onset occurs in two distinct phases: first in the Bay of Bengal (BoB), followed by the Arabian Sea (AS). However, the possible mechanistic linkage between these phases remains unclear. Based on observational analysis, this study investigates how the BoB monsoon onset preconditions the subsequent AS monsoon onset, with particular focus on the pivotal trigger of the AS monsoon—the intraseasonal oscillation (ISO-AS). We demonstrate that the BoB monsoon onset establishes an easterly vertical wind shear across the northern Indian Ocean. The shear environment interacts with the ascending motion of the ISO-AS, which develops approximately 1 month later, enhancing cyclonic vorticity north of the convection center of the ISO-AS. This process, in turn, promotes moisture convergence in the boundary layer and facilitates the northward propagation of the ISO-AS, ultimately triggering the summer monsoon onset in the AS. By elucidating the stepwise nature of monsoon onset in the northern Indian Ocean, this work offers valuable insights for improving predictions of the Asian summer monsoon.","PeriodicalId":50734,"journal":{"name":"Atmospheric Science Letters","volume":"26 9","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://rmets.onlinelibrary.wiley.com/doi/epdf/10.1002/asl.1313","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144930032","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

Assessing the Impact of Post-Fire Land-Surface Changes on Weather Forecasting in Two Forested Areas 评估火灾后地表变化对两个林区天气预报的影响

IF 2 4区地球科学

Atmospheric Science Letters Pub Date : 2025-09-02 DOI: 10.1002/asl.1310

Siwei He

{"title":"Assessing the Impact of Post-Fire Land-Surface Changes on Weather Forecasting in Two Forested Areas","authors":"Siwei He","doi":"10.1002/asl.1310","DOIUrl":"10.1002/asl.1310","url":null,"abstract":"Wildfires have extensively burned areas worldwide, with significant impacts in various aspects of life. Among these, wildfires affect land-surface properties, such as vegetation nature and soil characteristics, from active burning to years and decades afterward. Despite this, the qualitative effects of post-wildfire conditions on short-term weather forecasting remain obscure. In this study, we investigated the impact of post-wildfire conditions on weather forecasting by considering post-wildfire land-surface conditions using the Weather Research and Forecasting (WRF) model in two burned forest areas. The changes in land-surface properties caused by wildfires were considered, including vegetation fraction, leaf area index, roughness length, emissivity, and soil hydraulic conductivity. The results show that post-wildfire land-surface properties have noticeable impacts on near-surface variables and atmospheric profiles. Over the study areas, the simulated near-surface air temperature could be approximately 1 K cooler and 0.75 g/kg moister if post-wildfire conditions are ignored, with impacts extending more than 3 km high in the vertical direction. This study also demonstrates that the effects of changes in land-surface properties over burned areas could extend to surrounding unburned areas.","PeriodicalId":50734,"journal":{"name":"Atmospheric Science Letters","volume":"26 9","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://rmets.onlinelibrary.wiley.com/doi/epdf/10.1002/asl.1310","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144930030","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

Recent Revision of the Water Vapour Continuum Model and Impact on Clear-Sky Shortwave Broadband Radiative Transfer Calculations 水汽连续体模式的最新修订及其对晴空短波宽带辐射传输计算的影响

IF 2 4区地球科学

Atmospheric Science Letters Pub Date : 2025-09-02 DOI: 10.1002/asl.1318

Kaah P. Menang

{"title":"Recent Revision of the Water Vapour Continuum Model and Impact on Clear-Sky Shortwave Broadband Radiative Transfer Calculations","authors":"Kaah P. Menang","doi":"10.1002/asl.1318","DOIUrl":"10.1002/asl.1318","url":null,"abstract":"The water vapour continuum needs to be accurately accounted for in atmospheric radiative transfer calculations. The offline ECMWF radiation scheme was used to assess the impact of the current disagreements in shortwave continuum absorption on the accuracy of clear-sky calculations of solar fluxes and heating rates from 2000 to 20,000 cm−1 for three standard atmospheres: tropical, mid-latitude summer, and sub-arctic winter. These calculations were carried out at a solar zenith angle of 45°, surface albedo of 0.2, and total solar irradiance of 1361.0 W m−2. The MT_CKD 2.5, MT_CKD 4.2, and CAVIAR continuum models were compared. These continuum models were each used to train the gas-optics tables required by the radiation scheme. Differences in the shortwave continuum have a modest impact on shortwave absorption and heating rates. The largest differences are found in the tropical atmosphere due to its higher water vapour content. Absorbed fluxes computed with MT_CKD 2.5 and MT_CKD 4.2 differ by up to ~1.3 W m−2 (0.6%) while those with CAVIAR and MT_CKD 4.2 differ by up to ~1.7 W m−2 (0.8%). The heating rate calculated with MT_CKD 2.5 is up to ~0.018 K d−1 (0.8%) less than that obtained with MT_CKD 4.2. Compared to the heating rate computed with MT_CKD 4.2, the heating rate with CAVIAR is up to ~0.035 K d−1 (1.5%) higher.","PeriodicalId":50734,"journal":{"name":"Atmospheric Science Letters","volume":"26 9","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://rmets.onlinelibrary.wiley.com/doi/epdf/10.1002/asl.1318","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144930031","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

The Representation of Surface Temperature Trends in C3S Seasonal Forecast Systems C3S季节预报系统地表温度变化趋势的表征

IF 2 4区地球科学

Atmospheric Science Letters Pub Date : 2025-08-13 DOI: 10.1002/asl.1316

Matthew Patterson, Daniel J. Befort, Julia F. Lockwood, John Slattery, Antje Weisheimer

引用次数: 0

Mechanistic Impacts of a Scale-Aware Convection Scheme on Typhoon Intensity: Diagnostics From Minimum Sea-Level Pressure 尺度感知对流方案对台风强度的机制影响：来自最低海平面气压的诊断

IF 2 4区地球科学

Atmospheric Science Letters Pub Date : 2025-07-20 DOI: 10.1002/asl.1315

Yanjie Liu, Xiaocong Wang, Yimin Liu, Hao Miao, Xuesong Zhu, Wei Huang, Yaxin Zhao, Kai Wang

{"title":"Mechanistic Impacts of a Scale-Aware Convection Scheme on Typhoon Intensity: Diagnostics From Minimum Sea-Level Pressure","authors":"Yanjie Liu, Xiaocong Wang, Yimin Liu, Hao Miao, Xuesong Zhu, Wei Huang, Yaxin Zhao, Kai Wang","doi":"10.1002/asl.1315","DOIUrl":"10.1002/asl.1315","url":null,"abstract":"This study investigates the impact of a scale-aware convective parameterization scheme (CPS) on the simulation of typhoon track and intensity through a series of experiments using the Global-to-Regional Integrated Forecast SysTem (GRIST) model. The results of four typhoon cases show the scale-aware CPS generally reduces the track error by about 15 km and the intensity error by about 10% compared to the default CPS. By analyzing the budget equation of surface pressure tendency, we found the surface pressure fall due to CPS heating is about 0.6 hPa h−1 weaker when the scale-aware CPS is used. This is, however, compensated by enhanced microphysics heating, which more than offsets the reduction in CPS and yields a net pressure depression of about 1 hPa h−1. In fact, when parameterized convection is suppressed, the microphysics process takes up the convective instability left over by CPS and stimulates even stronger diabatic heating by 13.8%. The increased microphysics precipitation, along with the intensified grid-scale ascending, further validates the assertion. The results of this study demonstrate the benefits of scale-aware CPS on typhoon modeling.","PeriodicalId":50734,"journal":{"name":"Atmospheric Science Letters","volume":"26 7","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/asl.1315","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144666544","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

Does Warming of the Tibetan Plateau Intensify or Weaken the Precipitation Rate of Landfalling Tropical Cyclones in China? 青藏高原变暖是增强还是减弱了中国登陆热带气旋的降水量？

IF 2 4区地球科学

Atmospheric Science Letters Pub Date : 2025-07-20 DOI: 10.1002/asl.1314

Gan Xu, Huijie Shi, Shoujuan Shu, Xuesong Chen, Jiabei Gu, Weijun Li

引用次数: 0