DOI: 10.1002/2017JC013534
Scopus记录号: 2-s2.0-85041064714
论文题名: Dynamic Topography and Sea Level Anomalies of the Southern Ocean: Variability and Teleconnections
作者: Armitage T.W.K. ; Kwok R. ; Thompson A.F. ; Cunningham G.
刊名: Journal of Geophysical Research: Oceans
ISSN: 21699275
出版年: 2018
卷: 123, 期: 1 起始页码: 613
结束页码: 630
语种: 英语
英文关键词: circulation
; climate variability
; marginal seas
; radar altimetry
; sea surface height
; Southern Ocean
Scopus关键词: anomaly
; climate change
; composite
; continental shelf
; CryoSat
; data set
; glaciology
; marginal sea
; ocean basin
; oceanic circulation
; oceanography
; radar altimetry
; sea level change
; sea surface height
; seasonal variation
; Southern Oscillation
; teleconnection
; topography
; Southern Ocean
英文摘要: This study combines sea surface height (SSH) estimates of the ice-covered Southern Ocean with conventional open-ocean SSH estimates from CryoSat-2 to produce monthly composites of dynamic ocean topography (DOT) and sea level anomaly (SLA) on a 50 km grid spanning 2011–2016. This data set reveals the full Southern Ocean SSH seasonal cycle for the first time; there is an antiphase relationship between sea level on the Antarctic continental shelf and the deeper basins, with coastal SSH highest in autumn and lowest in spring. As a result of this pattern of seasonal SSH variability, the barotropic component of the Antarctic Slope Current (ASC) has speeds that are regionally up to twice as fast in the autumn. Month-to-month circulation variability of the Ross and Weddell Gyres is strongly influenced by the local wind field, and is correlated with the local wind curl (Ross: −0.58; Weddell: −0.67). SSH variability is linked to both the Southern Oscillation and the Southern Annular Mode, dominant modes of southern hemisphere climate variability. In particular, during the strong 2015–2016 El Niño, a sustained negative coastal SLA of up to −6 cm, implying a weakening of the ASC, was observed in the Pacific sector of the Southern Ocean. The ability to examine sea level variability in the seasonally ice-covered regions of the Southern Ocean—climatically important regions with an acute sparsity of data—makes this new merged sea level record of particular interest to the Southern Ocean oceanography and glaciology communities. © 2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114803
Appears in Collections: 气候减缓与适应
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作者单位: Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; Environmental Science and Engineering, California Institute of Technology, Pasadena, CA, United States
Recommended Citation:
Armitage T.W.K.,Kwok R.,Thompson A.F.,et al. Dynamic Topography and Sea Level Anomalies of the Southern Ocean: Variability and Teleconnections[J]. Journal of Geophysical Research: Oceans,2018-01-01,123(1)