Atmospheric Science Letters最新文献_第5页

IF 2 4区地球科学

Atmospheric Science Letters Pub Date : 2026-04-21

引用次数: 0

Radio-Frequency Interference Identification and Correction for Microwave Radiation Imager on FY-3G Using a Deep Neural Network Model 基于深度神经网络模型的FY-3G微波辐射成像仪射频干扰识别与校正

IF 2 4区地球科学

Atmospheric Science Letters Pub Date : 2026-04-21 DOI: 10.1002/asl2.70018

Xiao Wenyan, Fang Xiang, Yang Jun

{"title":"Radio-Frequency Interference Identification and Correction for Microwave Radiation Imager on FY-3G Using a Deep Neural Network Model","authors":"Xiao Wenyan, Fang Xiang, Yang Jun","doi":"10.1002/asl2.70018","DOIUrl":"10.1002/asl2.70018","url":null,"abstract":"This study addresses the challenge of radio-frequency interference (RFI) in brightness temperature (BT) observations from China's FY-3G satellite, a low-inclination-orbit platform equipped with a Microwave Radiation Imager (MWRI) designed for precipitation monitoring. To mitigate RFI contamination, we propose a deep neural network (DNN) framework that integrates multidimensional features, including interchannel correlations, topographic variables, and principal components, with particular emphasis on the complex conditions near land–sea boundaries. Validation using FY-3G seasonal orbital data demonstrates outstanding performance, with simulated BTs achieving correlation coefficients greater than 0.999 and standard deviations below 0.5 K. An RFI index derived from residual analysis enables effective identification and correction of contamination, and results further show that in snow- and ice-covered regions during winter, the proposed method significantly outperforms conventional techniques. The corrected BT dataset improves spatial and temporal consistency and provides reliable input for geophysical retrievals, including land surface temperature estimation, thereby confirming the practical applicability of the framework. Compared with existing approaches, the proposed method enhances generalization capability, improves detection accuracy, and reduces false alarms, ultimately establishing a robust quality control mechanism for the low-frequency channels of FY-3G MWRI.","PeriodicalId":50734,"journal":{"name":"Atmospheric Science Letters","volume":"27 4","pages":""},"PeriodicalIF":2.0,"publicationDate":"2026-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/asl2.70018","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148039854","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

Correction to “The Representation of Surface Temperature Trends in C3s Seasonal Forecast Systems.” 对“C3s季节预报系统地表温度趋势的表示”的更正。

IF 2 4区地球科学

Atmospheric Science Letters Pub Date : 2026-04-21 DOI: 10.1002/asl2.70032

引用次数: 0

Impact of Aggregational Growth Modeling on the Intensification of Extreme Tropical Cyclones Through Radiative Feedbacks 基于辐射反馈的聚集增长模式对极端热带气旋增强的影响

IF 2 4区地球科学

Atmospheric Science Letters Pub Date : 2026-04-16 DOI: 10.1002/asl2.70023

Yutaro Nirasawa, Tatsuya Seiki, Yohei Yamada, Chieko Suzuki

{"title":"Impact of Aggregational Growth Modeling on the Intensification of Extreme Tropical Cyclones Through Radiative Feedbacks","authors":"Yutaro Nirasawa, Tatsuya Seiki, Yohei Yamada, Chieko Suzuki","doi":"10.1002/asl2.70023","DOIUrl":"10.1002/asl2.70023","url":null,"abstract":"The sensitivity of tropical cyclone (TC) intensity to cloud microphysical processes is investigated using large-ensemble simulations with a global high-resolution climate model for five recent cases of extremely intense TCs. This study focuses on the aggregational growth of ice particles, which strongly depends on the representation of the collection kernel and affects the extent of upper-level clouds. The ensemble experiments demonstrate that a more accurate treatment of the collection kernel leads to a statistically significant increase in TC intensity compared with a simplified scheme. The modification enhances known radiation-convection interactions that favor TC intensification: a sharper horizontal gradient of longwave cloud-radiative forcing near the eyewall suppresses rainbands beyond the radius of maximum wind, thereby weakening their inhibition of angular momentum supply into the TC core and intensifying the TC. Therefore, mass exchange among cloud ice, snow, and graupel—modulating upper-level cloud-radiative forcing—plays a key role in achieving a more realistic simulation of TC intensity.","PeriodicalId":50734,"journal":{"name":"Atmospheric Science Letters","volume":"27 4","pages":""},"PeriodicalIF":2.0,"publicationDate":"2026-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/asl2.70023","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148039873","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 : 2026-04-16

引用次数: 0

Cold Waves in a Changing Climate: Characteristics, Trends, and Large-Scale Drivers in Northern Europe and the Alps 气候变化中的寒潮：北欧和阿尔卑斯山的特征、趋势和大规模驱动因素

IF 2 4区地球科学

Atmospheric Science Letters Pub Date : 2026-04-13 DOI: 10.1002/asl2.70021

Meriem Krouma, Michael K. Schutte, Loïc Maniora

{"title":"Cold Waves in a Changing Climate: Characteristics, Trends, and Large-Scale Drivers in Northern Europe and the Alps","authors":"Meriem Krouma, Michael K. Schutte, Loïc Maniora","doi":"10.1002/asl2.70021","DOIUrl":"10.1002/asl2.70021","url":null,"abstract":"Cold waves continue to pose severe challenges to infrastructure, agriculture, ecosystems, and public health across Europe despite an overall warming trend driven by anthropogenic greenhouse gas emissions. In this study, we present a comprehensive analysis of 84 boreal winters (November 1940–March 2024) using ERA5 reanalysis data to quantify changes in cold-wave frequency, duration, and intensity within two climatically sensitive domains: northern Europe and the Alps. Despite regional variability in cold wave characteristics, we detect statistically significant declines in annual cold-wave frequency (−0.33 to −0.36 events per decade), event durations (−0.14 to −0.19 days per decade), and warming of event anomalies (+0.11°C to +0.14°C per decade) in both regions. Dynamical attribution links these trends to shifts in large-scale circulation. The ratio of cold waves associated with a negative North Atlantic Oscillation (NAO) reduces, but increases for positive NAO phases. Weather-regime composites reveal spatial heterogeneity in large-scale driver impacts, with regional factors such as topography further shaping cold-wave characteristics. These findings highlight the coupled roles of thermodynamic warming and circulation variability in modulating European cold extremes.","PeriodicalId":50734,"journal":{"name":"Atmospheric Science Letters","volume":"27 4","pages":""},"PeriodicalIF":2.0,"publicationDate":"2026-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://rmets.onlinelibrary.wiley.com/doi/epdf/10.1002/asl2.70021","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147683808","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 : 2026-04-13

引用次数: 0

IF 2 4区地球科学

Atmospheric Science Letters Pub Date : 2026-04-08

引用次数: 0

Sensitivity of Heatwave Characteristics to the Climatic Baseline 热浪特征对气候基线的敏感性

IF 2 4区地球科学

Atmospheric Science Letters Pub Date : 2026-04-08 DOI: 10.1002/asl2.70017

Vivian A. Fraser-Leonhardt, Gabriele C. Hegerl, James D. P. Mollard

{"title":"Sensitivity of Heatwave Characteristics to the Climatic Baseline","authors":"Vivian A. Fraser-Leonhardt, Gabriele C. Hegerl, James D. P. Mollard","doi":"10.1002/asl2.70017","DOIUrl":"10.1002/asl2.70017","url":null,"abstract":"Temperature extremes are usually defined relative to conditions during a past baseline period. Due to global warming, different baselines produce different results for heatwave frequency, intensity, spatial extent and duration. This study investigates how the choice of baseline affects summer heatwave metrics across Europe from 1950 to 2023. We evaluate regional and temporal differences in heatwave characteristics using both grid-point analysis and a case study of the 2003 European heatwaves using observational daily maximum summer temperature for three different baselines (1961–1990, 1981–2010 and 1991–2020). Results show that more recent baselines yield a substantial reduction across Europe in observed heatwave frequency, of up to 12 days per summer in some southern European regions. The average intensity of heatwaves relative to the 90th percentile decreases by up to 2.0°C when using more recent baselines. The largest reductions are observed in southern and central Europe. The spatial extent of the 2003 European heatwave declines by more than 0.5 million km2 if using more recent baselines, and the duration shortens by up to 2 days as conditions that would have been extreme in the past are nearer the new normal. However, 2003 is still classified as a mega-heatwave under both baselines. Comparisons of fixed, detrended and rolling reference approaches show that methods that vary baselines, assuming linear warming—despite its unrealistic nature—yield similar results to rolling reference windows from 1960 onward.","PeriodicalId":50734,"journal":{"name":"Atmospheric Science Letters","volume":"27 4","pages":""},"PeriodicalIF":2.0,"publicationDate":"2026-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://rmets.onlinelibrary.wiley.com/doi/epdf/10.1002/asl2.70017","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147683520","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

Unraveling the South–North Dipole in August Precipitation–Surface Air Temperature Relationship Over the Tibetan Plateau 青藏高原8月降水-地表气温关系的南北偶极子解析

IF 2 4区地球科学

Atmospheric Science Letters Pub Date : 2026-03-29 DOI: 10.1002/asl2.70028

Zouxing Lin, Yifeng Lin, Zhongren Deng

{"title":"Unraveling the South–North Dipole in August Precipitation–Surface Air Temperature Relationship Over the Tibetan Plateau","authors":"Zouxing Lin, Yifeng Lin, Zhongren Deng","doi":"10.1002/asl2.70028","DOIUrl":"10.1002/asl2.70028","url":null,"abstract":"The Tibetan Plateau (TP) exerts strong summer thermal forcing that plays a critical role in regulating regional and even global climate anomalies. However, how radiative feedback associated with precipitation modulates surface thermal conditions over the TP remains incompletely understood. Using the high-resolution CMFD 2.0 dataset by integrating multisource observational data, this study investigates the relationship between precipitation and surface air temperature (SAT) during the peak rainy month (August) over the TP for the period 1980–2023. The results show a pronounced south–north dipole pattern in the precipitation–SAT relationship, characterized by negative correlations over the southern TP and positive correlations over the northern TP. Further analysis indicates that, in the southern TP, increased precipitation leads to a reduction in surface shortwave radiation downward (SSRD), thereby weakening surface heating and cooling the SAT. In contrast, in the northern TP, increased precipitation enhances surface longwave radiation downward (SLRD), strengthening atmospheric heating and raising SAT. These responses are consistent with the respective responses of SAT to SSRD and SLRD in the southern and northern TP, respectively. Therefore, this study provides a novel perspective on how precipitation over the TP modulates surface thermal anomalies through distinct shortwave and longwave radiative feedback processes.","PeriodicalId":50734,"journal":{"name":"Atmospheric Science Letters","volume":"27 4","pages":""},"PeriodicalIF":2.0,"publicationDate":"2026-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://rmets.onlinelibrary.wiley.com/doi/epdf/10.1002/asl2.70028","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147684093","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