{"title":"2019-2023年北大西洋热带气旋云物理特性日变化","authors":"Cuiping Liu, Feng Zhang, Huiling Ouyang, Wenwen Li, Zhijun Zhao","doi":"10.1029/2025GL115566","DOIUrl":null,"url":null,"abstract":"<p>Diurnal cloud variations critically modulate tropical cyclone (TC) precipitation and intensity, yet remain poorly understood due to the lack of continuous observations. This study examined diurnal characteristics in North Atlantic TCs (2019–2023) based on retrieved cloud properties from GOES infrared measurements using ResUnet—a machine learning framework (ResUnet-GOES). Results revealed distinct diurnal cycles: while average cloud top heights (CTHs) within the TC inner region (0–200 km) exhibited dual peaks at 05 and 14 local standard time (LST), cloud optical thickness (COT) and cloud water path (CWP) maximized singularly at 05 LST, contrasting with maxima in cloud effective radius (CER) at 16 LST. Notably, regarding deep convective clouds (DCCs) within the TC inner region, the average CTH, CWP, and coverage increased synchronously at night and peaked in early morning, providing the micro-physical evidence for the early morning peak in TC precipitation. These diurnal signatures may serve as reliable indicators for diagnosing TC convective variability.</p>","PeriodicalId":12523,"journal":{"name":"Geophysical Research Letters","volume":"52 13","pages":""},"PeriodicalIF":4.6000,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2025GL115566","citationCount":"0","resultStr":"{\"title\":\"Diurnal Variation of Cloud Physical Properties for Tropical Cyclones Over North Atlantic in 2019–2023\",\"authors\":\"Cuiping Liu, Feng Zhang, Huiling Ouyang, Wenwen Li, Zhijun Zhao\",\"doi\":\"10.1029/2025GL115566\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>Diurnal cloud variations critically modulate tropical cyclone (TC) precipitation and intensity, yet remain poorly understood due to the lack of continuous observations. This study examined diurnal characteristics in North Atlantic TCs (2019–2023) based on retrieved cloud properties from GOES infrared measurements using ResUnet—a machine learning framework (ResUnet-GOES). Results revealed distinct diurnal cycles: while average cloud top heights (CTHs) within the TC inner region (0–200 km) exhibited dual peaks at 05 and 14 local standard time (LST), cloud optical thickness (COT) and cloud water path (CWP) maximized singularly at 05 LST, contrasting with maxima in cloud effective radius (CER) at 16 LST. Notably, regarding deep convective clouds (DCCs) within the TC inner region, the average CTH, CWP, and coverage increased synchronously at night and peaked in early morning, providing the micro-physical evidence for the early morning peak in TC precipitation. These diurnal signatures may serve as reliable indicators for diagnosing TC convective variability.</p>\",\"PeriodicalId\":12523,\"journal\":{\"name\":\"Geophysical Research Letters\",\"volume\":\"52 13\",\"pages\":\"\"},\"PeriodicalIF\":4.6000,\"publicationDate\":\"2025-06-30\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://onlinelibrary.wiley.com/doi/epdf/10.1029/2025GL115566\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Geophysical Research Letters\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://onlinelibrary.wiley.com/doi/10.1029/2025GL115566\",\"RegionNum\":1,\"RegionCategory\":\"地球科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"GEOSCIENCES, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Geophysical Research Letters","FirstCategoryId":"89","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1029/2025GL115566","RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"GEOSCIENCES, MULTIDISCIPLINARY","Score":null,"Total":0}
Diurnal Variation of Cloud Physical Properties for Tropical Cyclones Over North Atlantic in 2019–2023
Diurnal cloud variations critically modulate tropical cyclone (TC) precipitation and intensity, yet remain poorly understood due to the lack of continuous observations. This study examined diurnal characteristics in North Atlantic TCs (2019–2023) based on retrieved cloud properties from GOES infrared measurements using ResUnet—a machine learning framework (ResUnet-GOES). Results revealed distinct diurnal cycles: while average cloud top heights (CTHs) within the TC inner region (0–200 km) exhibited dual peaks at 05 and 14 local standard time (LST), cloud optical thickness (COT) and cloud water path (CWP) maximized singularly at 05 LST, contrasting with maxima in cloud effective radius (CER) at 16 LST. Notably, regarding deep convective clouds (DCCs) within the TC inner region, the average CTH, CWP, and coverage increased synchronously at night and peaked in early morning, providing the micro-physical evidence for the early morning peak in TC precipitation. These diurnal signatures may serve as reliable indicators for diagnosing TC convective variability.
期刊介绍：
Geophysical Research Letters (GRL) publishes high-impact, innovative, and timely research on major scientific advances in all the major geoscience disciplines. Papers are communications-length articles and should have broad and immediate implications in their discipline or across the geosciences. GRLmaintains the fastest turn-around of all high-impact publications in the geosciences and works closely with authors to ensure broad visibility of top papers.
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