DOI: 10.1175/JCLI-D-12-00294.1
Scopus记录号: 2-s2.0-84880647122
论文题名: Influence of the extratropical ocean circulation on the intertropical convergence zone in an idealized coupled general circulation model
作者: Fučkar N.S. ; Xie S.-P. ; Farneti R. ; Maroon E.A. ; Frierson D.M.W.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期: 13 起始页码: 4612
结束页码: 4629
语种: 英语
Scopus关键词: Circumpolar channels
; Coupled general circulation models
; Deep-water formation
; Deep-water production
; Extratropical ocean
; Intertropical convergence zone
; Meridional overturning circulations
; Ocean heat transport
; Computer simulation
; Geophysics
; Heat transfer
; Oceanography
; atmospheric general circulation model
; extratropical environment
; Hadley cell
; heat transfer
; intertropical convergence zone
; meridional circulation
; Northern Hemisphere
; oceanic circulation
; salinity
; Southern Hemisphere
英文摘要: The authors present coupled model simulations in which the ocean's meridional overturning circulation (MOC) sets the zonal mean location of the intertropical convergence zone (ITCZ) in the hemisphere with deep-water production. They use a coarse-resolution single-basin sector coupled general circulation model (CGCM) with simplified atmospheric physics and two idealized land-sea distributions. In an equatorially symmetric closed-basin setting, unforced climate asymmetry develops because of the advective circulation-salinity feedback that amplifies the asymmetry of the deep-MOC cell and the upperocean meridional salinity transport. It confines the deep-water production and the dominant extratropical ocean heat release to a randomly selected hemisphere. The resultant ocean heat transport (OHT) toward the hemisphere with the deep-water source is partially compensated by the atmospheric heat transport (AHT) across the equator via an asymmetric Hadley circulation, setting the ITCZ in the hemisphere warmed by the ocean. When a circumpolar channel is open at subpolar latitudes, the circumpolar current disrupts the poleward transport of the upper-ocean saline water and suppresses deep-water formation poleward of the channel. The MOC adjusts by lowering the main pycnocline and shifting the deep-water production into the opposite hemisphere from the channel, and the ITCZ location follows the deep-water source again because of the Hadley circulation adjustment to cross-equatorial OHT. The climate response is sensitive to the sill depth of the channel but becomes saturated when the sill is deeper than the main pycnocline depth in subtropics. In simulations with a circumpolar channel, the ITCZ is in the Northern Hemisphere (NH) because of the Southern Hemisphere (SH) circumpolar flow that forces northward OHT. © 2013 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51809
Appears in Collections: 气候变化事实与影响
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作者单位: International Pacific Research Center, University of Hawaii at Manoa, Honolulu, HI, United States; International Pacific Research Center, Department of Meteorology, University of Hawaii at Manoa, Honolulu, HI, United States; Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA, United States; Earth System Physics Section, International Centre for Theoretical Physics, Trieste, Italy; Department of Atmospheric Sciences, University of Washington, Seattle, WA, United States
Recommended Citation:
Fučkar N.S.,Xie S.-P.,Farneti R.,et al. Influence of the extratropical ocean circulation on the intertropical convergence zone in an idealized coupled general circulation model[J]. Journal of Climate,2013-01-01,26(13)