DOI: 10.1175/JCLI-D-14-00797.1
Scopus记录号: 2-s2.0-84958085601
论文题名: The response of the tropical Atlantic and West African climate to Saharan dust in a fully coupled GCM
作者: Strong J.D.O. ; Vecchi G.A. ; Ginoux P.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2015
卷: 28, 期: 18 起始页码: 7071
结束页码: 7092
语种: 英语
Scopus关键词: Atmospheric radiation
; Atmospheric thermodynamics
; Climate models
; Enthalpy
; Ocean currents
; Oceanography
; Optical properties
; Storms
; Tropics
; Africa
; Atlantic Ocean
; Atmosphere-ocean interactions
; Coupled models
; Dust or dust storms
; Hydrologic cycles
; Dust
; absorption coefficient
; aerosol
; air-sea interaction
; atmospheric general circulation model
; dust
; dust storm
; hydrological cycle
; light scattering
; oceanic current
; radiative forcing
; thermodynamics
; Atlantic Ocean
; Atlantic Ocean (Tropical)
; Sahara
; West Africa
英文摘要: This study examines the climate response in West Africa and the tropical Atlantic to an idealized aerosol radiative forcing from Saharan mineral dust, comparable to the observed changes between the 1960s and 1990s, using simulations with the fully coupled GFDL Climate Model, version 2.1 (CM2.1), for two optical property regimes: more absorbing (ABS) and more scattering (SCT) dust. For both regimes dust induces significant regional reductions in radiative flux at the surface (approximately -30 W m-2). At the top of the atmosphere (TOA) dust in the two simulations produces a radiative flux anomaly of opposite sign (+30 W m-2 in the ABS case and -20 W m-2 in the SCT case). These differences result in opposing regional hydrologic and thermodynamic effects of dust. The ABS-forced simulations show an increase in the West African monsoon resulting from dust, whereas in the SCT-forced simulations dust causes a decrease in the monsoon. This is due to moist enthalpy changes throughout the atmospheric column over West Africa creating either horizontal divergence or convergence near the surface, respectively. In the tropical North Atlantic, dust acts to cool the ocean surface. However, in the subsurface the ABS-forced simulations show a decrease in upper-ocean heat content, while the SCT-forced simulations show an increase in upper-ocean heat content. The peak differences primarily arise from the wind stress curl response to a shift in the Atlantic ITCZ and associated mixed layer depth anomalies. Changes to upper-ocean currents are also found to be important in transporting energy across the equator. © 2015 American Meteorological Society. 资助项目: DOC, U.S. Department of Commerce
; 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/50362
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:
Strong J.D.O.,Vecchi G.A.,Ginoux P.. The response of the tropical Atlantic and West African climate to Saharan dust in a fully coupled GCM[J]. Journal of Climate,2015-01-01,28(18)