On the Nature of Caspian Clouds

作     者：Rashedi SHAHNAZ Mohammadi GOLAMHASAN Jahanbakhshasl SAEED Khorshiddoust ALI MOHAMMAD Sorooshian ARMIN Dmitrovic SANJA Tajbar SAPNA Rashedi SHAHNAZ;Mohammadi GOLAMHASAN;Jahanbakhshasl SAEED;Khorshiddoust ALI MOHAMMAD;Sorooshian ARMIN;Dmitrovic SANJA;Tajbar SAPNA

作者机构：Faculty of Planning and Environmental SciencesUniversity of TabrizEast Azerbaijan51666Iran ClimatologyIslamic Republic of Iran Meteorological OrganizationEast Azerbaijan Province Central Bureau of MeteorologyTabriz51999Iran James C.Wyant College of Optical SciencesUniversity of ArizonaArizona85721USA Department of Chemical and Environmental EngineeringUniversity of ArizonaArizona85721USA 

出 版 物：《Journal of Meteorological Research》 (气象学报（英文版）)

年 卷 期：2023年第37卷第2期

页      面：262-272页

核心收录：

学科分类：07[理学] 070601[理学-气象学] 0706[理学-大气科学] 

基　　金：This work was supported by the Department of Climatology at the University of Tabriz 

主　　题：Caspian clouds south coast of the Caspian Sea Moderate Resolution Imaging Spectroradiometer(MODIS) aerosol orographic lift Hybrid Single-Particle Lagrangian Integrated Trajectory(HYSPLIT)model 

摘      要：Caspian clouds(CCs)are formed between the southern coast of the Caspian Sea and the Alborz *** purpose of this study is to identify characteristics of CCs using aerosol,cloud,and meteorological data from ModernEra Retrospective analysis for Research and Applications version 2(MERRA-2),Moderate Resolution Imaging Spectroradiometer(MODIS),and ECMWF Reanalysis version 5(ERA5)during 2000–*** this period,we identified and investigated 636 days with *** results indicated that the frequency(%)of these clouds was higher in the summer than in other seasons because synoptic system activity varies between hot and cold *** hot season with the beginning of high-pressure subtropical Azores activity and the formation of a stable atmosphere in northern Iran leads to more frequent occurrence of *** clouds are mainly the low-and middle-level clouds in the region,e.g.,stratus and *** resulted in 13.9%of annual rainfall,and 55.9%and 18.7%of the summer and autumn rainfall,respectively,relative to total rainfall from all cloud types in the study *** the multivariate regression analysis,CC precipitation exhibited a strong positive relationship with the cloud water path(CWP),cloud optical thickness(COT),and cloud effective radius(CER).A comparison of the mean and standard deviation of aerosol optical thickness(AOT)and aerosol index(AI)for CC and non-CC days did not show a significant *** of the synoptic patterns showed that the main factors in the formation of CCs are the specific environmental conditions of the region and the orographic lift of stable air *** Hybrid Single-Particle Lagrangian Integrated Trajectory(HYSPLIT)model indicated that the source of moisture for the formation of CCs was largely the Caspian Sea.