DOI: 10.1002/2014GL060428
论文题名: Seasonal variations in the South Atlantic Meridional Overturning Circulation from observations and numerical models
作者: Dong S. ; Baringer M.O. ; Goni G.J. ; Meinen C.S. ; Garzoli S.L.
刊名: Geophysical Research Letters
ISSN: 0094-9977
EISSN: 1944-9708
出版年: 2014
卷: 41, 期: 13 起始页码: 4611
结束页码: 4618
语种: 英语
英文关键词: AMOC
; numerical models
; observations
; seasonal variations
; South Atlantic
Scopus关键词: Oceanography
; AMOC
; Atlantic meridional overturning circulations
; Geostrophic transport
; observations
; Seasonal variation
; South Atlantic
; Surface mixed layers
; Vertical stratification
; Numerical models
英文摘要: Monthly climatologies of temperature and salinity from observations and numerical models are used to estimate the Atlantic Meridional Overturning Circulation (AMOC) at 34°S. Observational estimates suggest that the geostrophic transport plays an equal role to the Ekman transport in the AMOC seasonal variations at this latitude, whereas in the models, the Ekman transport controls the AMOC seasonality. The seasonality of the geostrophic transport from observations is largely controlled by the seasonal density variations at the western boundary, but in the models, the eastern boundary dominates. The observed density seasonality at the western boundary is linked to the intensity of the Malvinas Current, which is poorly reproduced in the models. The results indicate that the weak seasonal cycle in the model geostrophic transport can primarily be attributed to excessively strong baroclinicity below the surface mixed layer, whereas the observations show a strong vertical coherence in the velocity down to 1200 m. Key Points Seasonal variations in geostrophic transport from models are too weak Boundary currents are not well reproduced in the models The models experience strong vertical stratification ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84903806900&doi=10.1002%2f2014GL060428&partnerID=40&md5=61d2957253944711ab5f98287e3c1959
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7241
Appears in Collections: 气候减缓与适应
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作者单位: CIMAS, University of Miami, Miami FL, United States
Recommended Citation:
Dong S.,Baringer M.O.,Goni G.J.,et al. Seasonal variations in the South Atlantic Meridional Overturning Circulation from observations and numerical models[J]. Geophysical Research Letters,2014-01-01,41(13).