DOI: 10.1007/s00382-013-1767-z
Scopus记录号: 2-s2.0-84897570380
论文题名: The ocean's role in setting the mean position of the Inter-Tropical Convergence Zone
作者: Marshall J. ; Donohoe A. ; Ferreira D. ; McGee D.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2014
卷: 42, 期: 2017-07-08 起始页码: 1967
结束页码: 1979
语种: 英语
英文关键词: Energy balance
; Heat transport
; ITCZ
; Ocean
英文摘要: Through study of observations and coupled climate simulations, it is argued that the mean position of the Inter-Tropical Convergence Zone (ITCZ) north of the equator is a consequence of a northwards heat transport across the equator by ocean circulation. Observations suggest that the hemispheric net radiative forcing of climate at the top of the atmosphere is almost perfectly symmetric about the equator, and so the total (atmosphere plus ocean) heat transport across the equator is small (order 0.2 PW northwards). Due to the Atlantic ocean's meridional overturning circulation, however, the ocean carries significantly more heat northwards across the equator (order 0.4 PW) than does the coupled system. There are two primary consequences. First, atmospheric heat transport is southwards across the equator to compensate (0.2 PW southwards), resulting in the ITCZ being displaced north of the equator. Second, the atmosphere, and indeed the ocean, is slightly warmer (by perhaps 2 °C) in the northern hemisphere than in the southern hemisphere. This leads to the northern hemisphere emitting slightly more outgoing longwave radiation than the southern hemisphere by virtue of its relative warmth, supporting the small northward heat transport by the coupled system across the equator. To conclude, the coupled nature of the problem is illustrated through study of atmosphere-ocean-ice simulations in the idealized setting of an aquaplanet, resolving the key processes at work. © 2013 The Author(s). 资助项目: NOAA, National Oceanic and Atmospheric Administration
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54657
Appears in Collections: 过去全球变化的重建
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作者单位: EAPS, Massachusetts Institute of Technology (MIT), 77 Massachusetts. Av., Cambridge, MA, United States
Recommended Citation:
Marshall J.,Donohoe A.,Ferreira D.,et al. The ocean's role in setting the mean position of the Inter-Tropical Convergence Zone[J]. Climate Dynamics,2014-01-01,42(2017-07-08)