DOI: 10.1007/s00382-013-1798-5
Scopus记录号: 2-s2.0-84891617314
论文题名: Atlantic watermass and circulation response to persistent freshwater forcing in two coupled general circulation models
作者: Harrison M. ; Adcroft A. ; Hallberg R.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2014
卷: 42, 期: 2017-01-02 起始页码: 59
结束页码: 68
语种: 英语
英文关键词: AMOC
; Atlantic
; Climate model bias
; CMIP5
; Freshwater fluxes
; GFDL
英文摘要: The sensitivity of the Atlantic circulation and watermasses to biases in the convergence of moisture into the basin is examined in this study using two different general circulation models. For a persistent positive moisture flux into the tropical Atlantic, the average salinity and temperature in the basin is reduced, mainly below mid-depths and in high latitudes. A transient reduction in the Atlantic overturning strength occurs in this case, with a recovery timescale of 1-2 centuries. In contrast, a similar amount of freshwater directed into the Subpolar North Atlantic results in a persistent reduction in overturning and an increase in basin heat and salt content. In the unperturbed pre-industrial simulations, the Atlantic is unambiguously warmer and saltier than historical observations below mid-depths and in the Nordic Seas. The models' tropical freshwater flux sensitivities project strongly onto the spatial pattern of this bias, suggesting a common atmospheric deficiency. The integrated Atlantic plus Arctic surface freshwater flux in these models is between -0.5 and -0.6 Sv, compared with an observational estimate of -0.28 Sv. Our results suggest that shortcomings in the models' ability to reproduce realistic bulk watermass properties are due to an overestimation of the inter-basin moisture export from the tropical Atlantic. © 2013 Springer-Verlag (outside the USA). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54501
Appears in Collections: 过去全球变化的重建
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作者单位: NOAA/GFDL, Princeton University Forrestal Campus, 201 Forrestal Road, Princeton, NJ, 08540-6649, United States; Princeton University, Princeton, NJ, 08542, United States
Recommended Citation:
Harrison M.,Adcroft A.,Hallberg R.. Atlantic watermass and circulation response to persistent freshwater forcing in two coupled general circulation models[J]. Climate Dynamics,2014-01-01,42(2017-01-02)