GSTDTAP  > 气候变化
DOI10.1029/2018JD028766
Which Extratropical Cyclones Contribute Most to the Transport of Moisture in the Southern Hemisphere?
Sinclair, V. A.1; Dacre, H. F.2
2019-03-16
发表期刊JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
ISSN2169-897X
EISSN2169-8996
出版年2019
卷号124期号:5页码:2525-2545
文章类型Article
语种英语
国家Finland; England
英文摘要

Predicted changes in Southern Hemisphere (SH) precipitation and Antarctic ice mass correspond to variations in the meridional moisture flux (MMF). Thirty-five years of ERA-Interim reanalysis data are combined with an extratropical cyclone (ETC) identification and tracking algorithm to investigate factors controlling SH MMF variability in the midlatitudes and near Antarctica. ETC characteristics which exert the strongest control on ETC MMF are determined thus identifying which ETCs contribute most to SH moisture transport. ETC poleward propagation speed exerts the strongest control on the ETC MMF across the Antarctic coastline. In SH winter, ETCs with the largest poleward propagation speeds transport 2.5 times more moisture than an average ETC. In the midlatitudes, ETC genesis latitude and poleward propagation speed have a similar influence on ETC MMF. Surprisingly, ETC maximum vorticity has little control on ETC MMF. Cyclone compositing is used to determine the reasons for these statistical relationships. ETCs generally exhibit a dipole of poleward and equatorward MMF downstream and upstream of the cyclone center, respectively. However, ETCs with the largest poleward propagation speeds resemble open frontal waves with strong poleward moisture transport downstream of the cyclone center only and thus result in the largest MMF. These results suggest that inhomogeneous trends and predicted changes in precipitation over Antarctica may be due to changes in cyclone track orientation, associated with changes to the large-scale background flow, in addition to changes in cyclone number or intensity.


英文关键词extratropical cyclones meridional moisture transport Antarctica precipitation Southern Hemisphere
领域气候变化
收录类别SCI-E
WOS记录号WOS:000462139800009
WOS关键词DRONNING MAUD LAND ; SNOW ACCUMULATION ; CLIMATE ; OCEAN ; PRECIPITATION ; TRACKING ; SIGNALS ; ORIGIN ; ERA-40 ; TRENDS
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/181673
专题气候变化
作者单位1.Univ Helsinki, Fac Sci, Inst Atmospher & Earth Syst Research Phys, Helsinki, Finland;
2.Univ Reading, Dept Meteorol, Reading, Berks, England
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Sinclair, V. A.,Dacre, H. F.. Which Extratropical Cyclones Contribute Most to the Transport of Moisture in the Southern Hemisphere?[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2019,124(5):2525-2545.
APA Sinclair, V. A.,&Dacre, H. F..(2019).Which Extratropical Cyclones Contribute Most to the Transport of Moisture in the Southern Hemisphere?.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,124(5),2525-2545.
MLA Sinclair, V. A.,et al."Which Extratropical Cyclones Contribute Most to the Transport of Moisture in the Southern Hemisphere?".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 124.5(2019):2525-2545.
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