Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018JD028766 |
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
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ISSN | 2169-897X |
EISSN | 2169-8996 |
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 |
推荐引用方式 GB/T 7714 | 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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