DOI: 10.1002/2017JC013382
Scopus记录号: 2-s2.0-85044516939
论文题名: Seasonal Variation of Barrier Layer in the Southern Ocean
作者: Pan L. ; Zhong Y. ; Liu H. ; Zhou L. ; Zhang Z. ; Zhou M.
刊名: Journal of Geophysical Research: Oceans
ISSN: 21699275
出版年: 2018
卷: 123, 期: 3 起始页码: 2238
结束页码: 2253
语种: 英语
英文关键词: barrier layer
; seasonal variation
; Southern Ocean
Scopus关键词: Argo
; Ekman transport
; heat budget
; heat flux
; isotherm
; mixed layer
; mode water
; natural barrier
; seasonal variation
; spatial distribution
; summer
; thermodynamics
; Australia
; Indian Sector
; Pacific Ocean
; Pacific Ocean (Southeast)
; Pacific Sector
; Southern Ocean
英文摘要: The seasonal variability of barrier layer (BL) and its formation mechanism in the Southern Ocean are investigated using the most recent Argo data. The results reveal that the BL is a persistent feature in the Southern Ocean with a strong seasonal cycle. The thickest BL appears in winter with the maximum amplitude exceeding 250 m while it dramatically decreases to less than 50 m in summer. The spatial distribution of BL is zonally oriented in the Pacific and Indian Ocean sectors, which is in agreement with that of the mixed layer depth (MLD) and the isothermal layer depth (ILD). Two areas with the most prominent BL are identified. One is located south of Australia and the other in the southeastern Pacific. The BL formation in both areas is generally attributed to a shallow mixed layer controlled by surface freshwater intrusion and a deep isothermal layer modulated by seasonal vertical convection. In the former region, the cold and fresh Antarctic Surface Water (ASW) is transported northward across the Subantarctic Front (SAF) by the Ekman effect and overlies the warm Subantarctic Mode Water (SAMW). The resulting inverse temperature structure facilitates the development of thick BLs. In the latter region, the BL emerges in the ventilation area where the shallow Surface Salinity Minimum Water (SSMW) coming from north leans against the deep vertical isotherms. In summer, positive surface heat flux into the ocean overwhelms other thermodynamic effects in the mixed layer heat budget. The MLD and ILD coincide and thus the BL is destroyed. © 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/114413
Appears in Collections: 气候减缓与适应
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作者单位: Institute of Oceanography, Shanghai Jiao Tong University, Shanghai, China; State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Hangzhou, China
Recommended Citation:
Pan L.,Zhong Y.,Liu H.,et al. Seasonal Variation of Barrier Layer in the Southern Ocean[J]. Journal of Geophysical Research: Oceans,2018-01-01,123(3)