DOI: 10.1175/JCLI-D-17-0513.1
Scopus记录号: 2-s2.0-85050206815
论文题名: A role for the equatorial undercurrent in the ocean dynamical thermostat
作者: Coats S. ; Karnauskas K.B.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 16 起始页码: 6245
结束页码: 6261
语种: 英语
英文关键词: Atmosphere-ocean interaction
; Climate change
; Climate models
; Trends
; Tropics
Scopus关键词: Atmospheric thermodynamics
; Budget control
; Climate change
; Climate models
; Surface waters
; Thermostats
; Tropics
; Wind stress
; Atmosphere-ocean interactions
; Coupled general circulation models
; Eastern equatorial Pacific
; Equatorial Pacific
; Equatorial undercurrents
; Sea surface temperature (SST)
; Trends
; Zonal atmospheric circulation
; Oceanography
; air-sea interaction
; atmospheric circulation
; climate change
; climate modeling
; general circulation model
; heat budget
; sea surface temperature
; trend analysis
; undercurrent
; upper ocean
; wind stress
; zonal wind
; Pacific Ocean
; Pacific Ocean (Equatorial)
英文摘要: Reconstructions of sea surface temperature (SST) based on instrumental observations suggest that the equatorial Pacific zonal SST gradient has increased over the twentieth century. While this increase is suggestive of the ocean dynamical thermostat mechanism of Clement et al., observations of a concurrent weakening of the zonal atmospheric (Walker) circulation are not. Here we show, using heat and momentum budget calculations on an ocean reanalysis dataset, that a seasonal weakening of the zonal atmospheric circulation is in fact consistent with cooling in the eastern equatorial Pacific (EEP) and thus an increase in the zonal SST gradient. This cooling is driven by a strengthening Equatorial Undercurrent (EUC) in response to decreased upper-ocean westward momentum associated with weakening equatorial zonal wind stress. This process can help to reconcile the seemingly contradictory twentieth-century trends in the tropical Pacific atmosphere and ocean. Moreover, it is shown that coupled general circulation models (CGCMs) do not correctly simulate this process; we identify a systematic bias in the relationship between changes in equatorial surface zonal wind stress in the EEP and EUC strength that may help to explain why observations and CGCMs have opposing trends in the zonal SST gradient over the twentieth century. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111411
Appears in Collections: 气候减缓与适应
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作者单位: Climate and Global Dynamics Laboratory, National Center for Atmospheric Research, Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO, United States; Cooperative Institute for Research in Environmental Sciences, Department of Atmospheric and Oceanic Sciences, University of Colorado Boulder, Boulder, CO, United States
Recommended Citation:
Coats S.,Karnauskas K.B.. A role for the equatorial undercurrent in the ocean dynamical thermostat[J]. Journal of Climate,2018-01-01,31(16)