DOI: 10.1002/joc.5513
论文题名: Sensitivity studies of the RegCM4 simulation in West and central Africa during strong and weak years of Atlantic cold tongue
作者: Kenfack S.C. ; Mkankam K.F. ; Alory G. ; Hounkonnou N.M. ; Komkoua Mbienda A.J. ; Choumbou P. ; Vondou D.A.
刊名: International Journal of Climatology
ISSN: 8998418
出版年: 2018
卷: 38, 期: 9 起始页码: 3513
结束页码: 3531
语种: 英语
英文关键词: Atlantic cold tongue
; RegCM4
; WAM
; West and central Africa
Scopus关键词: Electric power system measurement
; Rain
; Wind
; African easterly jet
; Atlantic cold tongue
; Central Africa
; Closure assumptions
; Massachusetts Institute of Technology
; RegCM4
; Regional climate modeling
; Regional distribution
; Climate models
; climate modeling
; easterly wave
; jet stream
; precipitation (climatology)
; rainfall
; regional climate
; sensitivity analysis
; wind
; Bauchi [Nigeria]
; Cameroon
; Central Africa
; East Africa
; Nigeria
; Sahel [Sub-Saharan Africa]
英文摘要: This study evaluates the ability of the Regional Climate Model (RegCM4) to reproduce the observed rainfall and wind over West and central Africa (WCA) during two contrasting years of the Atlantic cold tongue (ACT): the very cold in 1992 and very warm in 2007 depicted by the Caniaux et al.’s index. The convective schemes of Kuo, Massachusetts Institute of Technology-Emanuel (Ema) and Grell with closure assumptions of Arakawa–Schubert (GAS) and Fritch–Chappel (GFC) were compared and the best scheme was tested to study the sensitivity of WCA climate to ACT in August of each chosen year—the month which follows that of the peak of ACT. Comparisons of simulations for 1992 and 2007 reveal that some areas are sensitive to extreme ACT events. The regional distribution of observed precipitation (wind) in August 2007 was heavier (lower intensity) than that for the 1992, particularly in West than central Africa region. From GPCP data, it is observed that the range of Cameroon highlands and the Bauchi Plateau of Nigeria are not significantly affected by the ACT. It is shown that rainfall of some subregions is very sensitive to ACT. The GFC scheme is capable of reproducing the amount and distribution of the precipitation for the 2 years in the ACT area, the west and east Guinean coasts, and failed to reproduce the rainfall in west and central Soudano–Sahel regions and East Africa. However, the Kuo scheme reproduces well in these three zones. Contrarily to rainfall, the Ema scheme better reproduces, but overestimating, the wind distribution in the Sahara region. GFC better simulates the wind speed sensitivity to ACT far from the coast in Soudano–Sahel and Nigeria–Cameroon zones. The GAS and Kuo are not well correlated with ERA-Interim in WCA. Most of the schemes adequately mimic the African easterly jet structure. © 2018 Royal Meteorological Society Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/116847
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: International Chair in Mathematical Physics and Applications, University of Abomey-Calavi, Cotonou, Benin; Laboratory for Environmental Modelling and Atmospheric Physics, Department of Physics, University of Yaounde 1, Yaounde, Cameroon; Mesoscopic and Multilayer Structures Laboratory (MMSL), Faculty of Science, Department of Physics, University of Dschang, Dschang, Cameroon; Laboratoire d’études en Géophysique et Océanographie Spatiales (LEGOS), Toulouse, France; Physics Departement, University of Dschang, Cameroon
Recommended Citation:
Kenfack S.C.,Mkankam K.F.,Alory G.,et al. Sensitivity studies of the RegCM4 simulation in West and central Africa during strong and weak years of Atlantic cold tongue[J]. International Journal of Climatology,2018-01-01,38(9)