DOI: 10.1175/JCLI-D-12-00095.1
Scopus记录号: 2-s2.0-84905915925
论文题名: How much has the North Atlantic ocean overturning circulation changed in the last 50 years?
作者: Tett S.F.B. ; Sherwin T.J. ; Shravat A. ; Browne O.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 16 起始页码: 6325
结束页码: 6342
语种: 英语
Scopus关键词: Climate models
; Climatology
; Atlantic meridional overturning circulations
; Circulation patterns
; Deep western boundary currents
; Greenland-Scotland Ridge
; Jet Propulsion Laboratory
; North Atlantic Ocean
; Overturning circulation
; Simple ocean data assimilations
; Oceanography
; boundary current
; climate change
; data assimilation
; gyre
; in situ measurement
; meridional circulation
; model test
; model validation
; overturn
; reliability analysis
; volume transport
; Atlantic Ocean
; Atlantic Ocean (North)
; Greenland-Scotland Ridge
; Labrador Sea
; Ora
英文摘要: Volume transports from six ocean reanalyses are compared with four sets of in situ observations: across the Greenland-Scotland ridge (GSR), in the Labrador Sea boundary current, in the deep western boundary current at 43°N, and in the Atlantic meridional overturning circulation (AMOC) at 26°N in the North Atlantic. The higher-resolution reanalyses (on the order of 1/4° × 1/4°) are better at reproducing the circulation pattern in the subpolar gyre than those with lower resolution (on the order of 1°). Simple Ocean Data Assimilation (SODA) and Estimating the Circulation and Climate of the Ocean (ECCO)-Jet Propulsion Laboratory (JPL) produce transports at 26°N that are close to those observed [17 Sv (1 Sv ≡106m3 s-1)]. ECCO, version 2, and SODA produce northward transports across the GSR (observed transport of 8.2 Sv) that are 22% and 29% too big, respectively. By contrast, the low-resolution reanalyses have transports that are either too small [by 31% for ECCO-JPL and 49% for Ocean Reanalysis, system 3 (ORA-S3)] or much too large [Decadal Prediction System (DePreSys)].SODAhad the best simulations of mixed layer depth and with two coarse grid long-term reanalyses (DePreSys and ORA-S3) is used to examine changes in North Atlantic circulation from 1960 to 2008. Its results suggest that the AMOC increased by about 20% at 26°N while transport across the GSR hardly altered. The other (less reliable) long-term reanalyses also had small changes across the GSR but changes of 110% and 220%, respectively, at 26°N. Thus, it appears that changes in the overturning circulation at 26°Nare decoupled from the flow across the GSR. It is recommended that transport observations should not be assimilated in ocean reanalyses but used for validation instead. © 2014 American Meteorological Society. 资助项目: NERC, Natural Environment Research Council
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51435
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: School of Geosciences, University of Edinburgh, Edinburgh, United Kingdom; Scottish Association for Marine Science, Scottish Marine Institute, Oban, United Kingdom
Recommended Citation:
Tett S.F.B.,Sherwin T.J.,Shravat A.,et al. How much has the North Atlantic ocean overturning circulation changed in the last 50 years?[J]. Journal of Climate,2014-01-01,27(16)