DOI: 10.1175/JCLI-D-11-00360.1
Scopus记录号: 2-s2.0-84865131293
论文题名: Biases in the atlantic ITCZ in seasonal-interannual variations for a coarse- and a high-resolution coupled climate model
作者: Doi T. ; Vecchi G.A. ; Rosati A.J. ; Delworth T.L.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2012
卷: 25, 期: 16 起始页码: 5494
结束页码: 5511
语种: 英语
Scopus关键词: Annual cycle
; Annual mean
; Atmosphere-ocean interactions
; Coupled climate model
; Coupled process
; Equatorial regions
; Fully-coupled
; Geophysical fluid dynamics laboratories
; High resolution
; Interannual
; Meridional migration
; Ocean-atmosphere
; Seasonal variation
; South America
; SST anomalies
; Tropical atlantic
; Climate change
; Rain
; Climate models
; air-sea interaction
; annual variation
; atmosphere-ocean coupling
; climate modeling
; intertropical convergence zone
; precipitation (climatology)
; sea surface temperature
; seasonal variation
; Atlantic Ocean
; Atlantic Ocean (Tropical)
英文摘要: Using two fully coupled ocean-atmosphere models-Climate Model version 2.1 (CM2.1), developed at the Geophysical Fluid Dynamics Laboratory, and Climate Model version 2.5 (CM2.5), a new high-resolution climate model based on CM2.1-the characteristics and sources of SST and precipitation biases associated with the Atlantic ITCZ have been investigated. CM2.5 has an improved simulation of the annual mean and the annual cycle of the rainfall over the Sahel and northern South America, while CM2.1 shows excessive Sahel rainfall and lack of northern South America rainfall in boreal summer. This marked improvement in CM2.5 is due to not only high-resolved orography but also a significant reduction of biases in the seasonal meridional migration of the ITCZ. In particular, the seasonal northward migration of the ITCZ in boreal summer is coupled to the seasonal variation of SST and a subsurface doming of the thermocline in the northeastern tropical Atlantic, known as the Guinea Dome. Improvements in the ITCZ allow for better representation of the coupled processes that are important for an abrupt seasonally phase-locked decay of the interannual SST anomaly in the northern tropical Atlantic. Nevertheless, the differences between CM2.5 and CM2.1 were not sufficient to reduce the warm SST biases in the eastern equatorial region and Angola-Benguela area. The weak bias of southerly winds along the southwestern African coast associated with the excessive southward migration bias of the ITCZ may be a key to improve the warm SST biases there. © 2012 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52299
Appears in Collections: 气候变化事实与影响
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作者单位: Atmospheric and Oceanic Sciences Program, Princeton University, Princeton, NJ, United States; NOAA/Geophysical Fluid Dynamics Laboratory, Princeton, NJ, United States
Recommended Citation:
Doi T.,Vecchi G.A.,Rosati A.J.,et al. Biases in the atlantic ITCZ in seasonal-interannual variations for a coarse- and a high-resolution coupled climate model[J]. Journal of Climate,2012-01-01,25(16)