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DOI | 10.1175/JAS-D-18-0068.1 |
Multiscale Atmospheric Overturning of the Indian Summer Monsoon as Seen through Isentropic Analysis | |
Chen, Xingchao1,2,3,4; Pauluis, Olivier M.3,4; Leung, L. Ruby5; Zhang, Fuqing1,2 | |
2018-09-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES |
ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2018 |
卷号 | 75期号:9页码:3011-3030 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; U Arab Emirates |
英文摘要 | This study investigates multiscale atmospheric overturning during the 2009 Indian summer monsoon (ISM) using a cloud-permitting numerical model. The isentropic analysis technique adopted here sorts vertical mass fluxes in terms of the equivalent potential temperature of air parcels, which is capable of delineating the atmospheric overturning between ascending air parcels with high entropy and subsiding air parcels with low entropy. The monsoonal overturning is further decomposed into contributions from three characteristic scales: the basinwide ascent over the Indian monsoon domain, the regional-scale overturning associated with synoptic and mesoscale systems, and the convective-scale overturning. Results show that the convective-scale component dominates the upward mass transport in the lower troposphere while the region-scale component plays an important role by deepening the monsoonal overturning. The spatial variability of the convective-scale overturning is analyzed, showing intense convection over the Western Ghats and the Bay of Bengal while the deepest overturning is localized over northern India and the Himalayan foothills. The equivalent potential temperature in convective updrafts is higher over land than over the ocean or coastal regions. There is also substantial variability in the atmospheric overturning associated with the intraseasonal variability. The upward mass and energy transport increase considerably during the active phases of the ISM. Aclear northeastward propagation in the peak isentropic verticalmass and energy transport over different characteristic regions can be found during the ISM, which corresponds to the intraseasonal oscillations of the ISM. Altogether, this study further demonstrates the utility of the isentropic analysis technique to characterize the spatiotemporal variations of convective activities in complex atmospheric flows. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000450964200002 |
WOS关键词 | MESOSCALE CONVECTIVE SYSTEMS ; SOUTH ASIAN MONSOON ; INTRASEASONAL OSCILLATIONS ; TIBETAN PLATEAU ; PART I ; VARIABILITY ; EVOLUTION ; MODEL ; LAYER |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/29330 |
专题 | 地球科学 |
作者单位 | 1.Penn State Univ, Dept Meteorol & Atmospher Sci, University Pk, PA 16802 USA; 2.Penn State Univ, Ctr Adv Data Assimilat & Predictabil Tech, University Pk, PA 16802 USA; 3.New York Univ Abu Dhabi, Ctr Prototype Climate Modeling, Abu Dhabi, U Arab Emirates; 4.NYU, Courant Inst Math Sci, New York, NY 10003 USA; 5.Pacific Northwest Natl Lab, Atmospher Sci & Global Change, Richland, WA 99352 USA |
推荐引用方式 GB/T 7714 | Chen, Xingchao,Pauluis, Olivier M.,Leung, L. Ruby,et al. Multiscale Atmospheric Overturning of the Indian Summer Monsoon as Seen through Isentropic Analysis[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2018,75(9):3011-3030. |
APA | Chen, Xingchao,Pauluis, Olivier M.,Leung, L. Ruby,&Zhang, Fuqing.(2018).Multiscale Atmospheric Overturning of the Indian Summer Monsoon as Seen through Isentropic Analysis.JOURNAL OF THE ATMOSPHERIC SCIENCES,75(9),3011-3030. |
MLA | Chen, Xingchao,et al."Multiscale Atmospheric Overturning of the Indian Summer Monsoon as Seen through Isentropic Analysis".JOURNAL OF THE ATMOSPHERIC SCIENCES 75.9(2018):3011-3030. |
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