DOI: 10.1002/grl.50396
论文题名: Baroclinic anomalies associated with the Southern Hemisphere Annular Mode: Roles of synoptic and low-frequency eddies
作者: Nie Y. ; Zhang Y. ; Yang X.-Q. ; Chen G.
刊名: Geophysical Research Letters
ISSN: 0094-9050
EISSN: 1944-8781
出版年: 2013
卷: 40, 期: 10 起始页码: 2361
结束页码: 2366
语种: 英语
英文关键词: baroclinic anomalies
; eddy-zonal flow interactions
; low-frequency eddy
; mean meridional circulation
; Southern Hemisphere Annular Mode
; synoptic eddy
Scopus关键词: Baroclinic
; Low-frequency
; Meridional circulation
; Southern hemisphere annular modes
; synoptic eddy
; Meteorology
; Heat flux
; atmospheric forcing
; baroclinic motion
; data set
; eddy
; frequency analysis
; heat flux
; meridional circulation
; momentum
; Southern Hemisphere
; temperature effect
英文摘要: Using the ERA-40 reanalysis data, we study the different roles of synoptic and low-frequency eddies in sustaining the latitudinal shift of the low-level baroclinicity associated with the Southern Hemisphere Annular Mode. The eddy effect is assessed through the direct eddy thermal forcing via eddy heat flux and the indirect forcing via eddy-driven mean meridional circulation (MMC). We find that in addition to the synoptic eddy-induced MMC suggested by Robinson (2006), the direct eddy thermal forcing by low-frequency eddies is significant in driving the baroclinic anomalies. These two processes together prevail over the direct baroclinicity deduction by synoptic eddies. The different effects of synoptic and low-frequency eddies might be attributed to the distinct latitudinal distributions of their low-level eddy heat flux relative to the midlatitude jet. The different roles of the MMC induced by synoptic eddy momentum and heat flux are also emphasized, with the former leading the baroclinic anomalies and the latter acting to extend the baroclinic anomalies. ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84879986395&doi=10.1002%2fgrl.50396&partnerID=40&md5=b80af0bdc5ede22cf1756265f30e85db
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6314
Appears in Collections: 气候减缓与适应
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作者单位: Institute for Climate and Global Change Research, School of Atmospheric Sciences, Nanjing University, Nanjing, China
Recommended Citation:
Nie Y.,Zhang Y.,Yang X.-Q.,et al. Baroclinic anomalies associated with the Southern Hemisphere Annular Mode: Roles of synoptic and low-frequency eddies[J]. Geophysical Research Letters,2013-01-01,40(10).