DOI: 10.1175/JCLI-D-13-00070.1
Scopus记录号: 2-s2.0-84899092210
论文题名: The surface-forced overturning of the North Atlantic: Estimates from modern era atmospheric reanalysis datasets
作者: Grist J.P. ; Josey S.A. ; Marsh R. ; Kwon Y.-O. ; Bingham R.J. ; Blaker A.T.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 10 起始页码: 3596
结束页码: 3618
语种: 英语
Scopus关键词: Cells
; Cytology
; Data processing
; Oceanography
; Tropics
; Atmospheric reanalysis
; Overturning circulation
; Research and application
; Sea surface salinity
; Sea surface temperature (SST)
; Subtropical mode waters
; Temporal variability
; Water mass transformation
; Estimation
; atmospheric modeling
; climate modeling
; data set
; estimation method
; mode water
; overturn
; sea surface salinity
; thermohaline circulation
; water mass
; weather forecasting
; Atlantic Ocean
; Atlantic Ocean (North)
英文摘要: Estimates of the recent mean and time varying water mass transformation rates associated with North Atlantic surface-forced overturning are presented. The estimates are derived from heat and freshwater surface fluxes and sea surface temperature fields from six atmospheric reanalyses-the Japanese 25-yr Reanalysis (JRA), the NCEP-NCAR reanalysis (NCEP1), the NCEP-U.S. Department of Energy (DOE) reanalysis (NCEP2), the European Centre for Medium-RangeWeather Forecasts (ECMWF) Interim Re-Analysis (ERA-I), the Climate Forecast System Reanalysis (CFSR), and the Modern-Era Reanalysis for Research and Applications (MERRA)-together with sea surface salinity fields from two globally gridded datasets (World Ocean Atlas and Met Office EN3 datasets). The resulting 12 estimates of the 1979-2007 mean surface-forced streamfunction all depict a subpolar cell, with maxima north of 45°N, near σ = 27.5kgm-3, and a subtropical cell between 20° and 40°N, near σ = 26.1 kgm-3. The mean magnitude of the subpolar cell varies between 12 and 18 Sv (1 Sv ≈ 106m3 s-1), consistent with estimates of the overturning circulation from subsurface observations. Analysis of the thermal and haline components of the surface density fluxes indicates that large differences in the inferred lowlatitude circulation are largely a result of the biases in reanalysis net heat flux fields, which range in the globalmean from -13 to 19 Wm-2. The different estimates of temporal variability in the subpolar cell are well correlated with each other. This suggests that the uncertainty associated with the choice of reanalysis product does not critically limit the ability of the method to infer the variability in the subpolar overturning. In contrast, the different estimates of subtropical variability are poorly correlated with each other, and only a subset of them captures a significant fraction of the variability in independently estimated North Atlantic Subtropical Mode Water volume. © 2014 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51115
Appears in Collections: 气候变化事实与影响
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作者单位: National Oceanography Centre, Southampton, United Kingdom; Ocean and Earth Science, University of Southampton, Southampton, United Kingdom; Woods Hole Oceanographic Institution, Woods Hole, MA, United States; School of Civil Engineering and Geosciences, Newcastle University, Newcastle upon Tyne, United Kingdom
Recommended Citation:
Grist J.P.,Josey S.A.,Marsh R.,et al. The surface-forced overturning of the North Atlantic: Estimates from modern era atmospheric reanalysis datasets[J]. Journal of Climate,2014-01-01,27(10)