DOI: 10.1175/JCLI-D-13-00052.1
Scopus记录号: 2-s2.0-84906872172
论文题名: A new index for the Atlantic meridional overturning circulation at 26°N
作者: Duchez A. ; Hirschi J.J.-M. ; Cunningham S.A. ; Blaker A.T. ; Bryden H.L. ; de Cuevas B. ; Atkinson C.P. ; McCarthy G.D. ; Frajka-Williams E. ; Rayner D. ; Smeed D. ; Mizielinski M.S.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 17 起始页码: 6439
结束页码: 6455
语种: 英语
Scopus关键词: Oceanography
; Atlantic meridional overturning circulations
; Current estimates
; Decadal timescale
; Decadal variability
; Ekman transport
; Geostrophic transport
; Global climate system
; Sverdrup transport
; Time measurement
英文摘要: The Atlantic meridional overturning circulation (AMOC) has received considerable attention, motivated by its major role in the global climate system. Observations ofAMOCstrength at 26°Nmade by the RapidClimateChange (RAPID) array provide the best current estimate of the state of the AMOC. The period 2004-11 when RAPID AMOC is available is too short to assess decadal variability of the AMOC. This modeling study introduces a new AMOC index (called AMOCSV) at 26°N that combines the Florida Straits transport, the Ekman transport, and the southward geostrophic Sverdrup transport. Themain hypothesis in this study is that the uppermidocean geostrophic transport calculated using the RAPID array is also wind-driven and can be approximated by the geostrophic Sverdrup transport at interannual and longer time scales. This index is expected to reflect variations in the AMOC at interannual to decadal time scales. This estimate of the surface branch of the AMOC can be constructed as long as reliablemeasurements are available for theGulf Stream and for wind stress. To test the reliability of the AMOCSV on interannual and longer time scales, two different numerical simulations are used: a forced and a coupled simulation.Using these simulations the AMOCSV captures a substantial fraction of the AMOC variability and is in good agreement with the AMOC transport at 26°N on both interannual and decadal time scales. These results indicate that it might be possible to extend the observation-based AMOC at 26°N back to the 1980s. © 2014 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51300
Appears in Collections: 气候变化事实与影响
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作者单位: National Oceanography Centre Southampton, Southampton, United Kingdom; Scottish Marine Institute Oban, Argyll, Scotland, United Kingdom; Met Office Hadley Centre, Exeter, United Kingdom
Recommended Citation:
Duchez A.,Hirschi J.J.-M.,Cunningham S.A.,et al. A new index for the Atlantic meridional overturning circulation at 26°N[J]. Journal of Climate,2014-01-01,27(17)