Arid
DOI10.1007/s00382-011-1255-2
The West African monsoon onset in 2006: sensitivity to surface albedo, orography, SST and synoptic scale dry-air intrusions using WRF
Flaounas, Emmanouil1; Janicot, Serge2; Bastin, Sophie1; Roca, Remy3
通讯作者Flaounas, Emmanouil
来源期刊CLIMATE DYNAMICS
ISSN0930-7575
EISSN1432-0894
出版年2012
卷号38期号:3-4页码:685-708
英文摘要

In order to test the sensitivity of the transitional phase of the 2006 West African monsoon (WAM) onset to different mechanisms, weather research and forecasting (WRF) model simulations have been carried out addressing the role of the Saharan heat low (SHL) and its sensitivity to the albedo field and to the northern Africa orography, and the role of the sea surface temperature (SST) in the eastern tropical Atlantic and Mediterranean. Lowering albedo over the desert region induces a northward location of the inter-tropical convergence zone (ITCZ), while removing mountains in North Africa reduces rainfall over West Africa. Shifting SST forward by 15 days leads to a northward location of the ITCZ before the WAM onset. However none of these factors modifies the timing of the WAM onset in 2006. The transitional phase of the 2006 WAM onset has been examined in more detail. The enhancement of SHL intensity, combined with the development of the oceanic cold tongue in the Guinea gulf, leads to low-level moisture flux divergence in the ITCZ reducing rainfall and increasing low-level humidity over the Sahel. However, weakening of convection can be clearly attributed to dry-air intrusions in mid-levels, originating from the subtropical westerly jet and associated with Rossby wave pattern over North Africa. Sensitivity tests on the synoptic scale forcing outside of the WRF model domain confirm the dominating role of large-scale dynamics to control the transitional phase of the WAM onset and its timing. However it is shown that the regional factors can modulate this larger scale forcing.


英文关键词West African monsoon onset WRF model Dry-air intrusions
类型Article
语种英语
国家France
收录类别SCI-E
WOS记录号WOS:000299899300015
WOS关键词INTRASEASONAL VARIABILITY ; HEAT LOW ; PART I ; DYNAMICS ; MODEL ; TEMPERATURE ; SAHEL ; SIMULATION ; ANOMALIES ; EVOLUTION
WOS类目Meteorology & Atmospheric Sciences
WOS研究方向Meteorology & Atmospheric Sciences
来源机构French National Research Institute for Sustainable Development
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/171812
作者单位1.UPMC, LATMOS IPSL, CNRS, F-75252 Paris 05, France;
2.UPMC, IRD, LOCEAN IPSL, F-75252 Paris 05, France;
3.UPMC, CNRS, LMD IPSL, F-75252 Paris 05, France
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GB/T 7714
Flaounas, Emmanouil,Janicot, Serge,Bastin, Sophie,et al. The West African monsoon onset in 2006: sensitivity to surface albedo, orography, SST and synoptic scale dry-air intrusions using WRF[J]. French National Research Institute for Sustainable Development,2012,38(3-4):685-708.
APA Flaounas, Emmanouil,Janicot, Serge,Bastin, Sophie,&Roca, Remy.(2012).The West African monsoon onset in 2006: sensitivity to surface albedo, orography, SST and synoptic scale dry-air intrusions using WRF.CLIMATE DYNAMICS,38(3-4),685-708.
MLA Flaounas, Emmanouil,et al."The West African monsoon onset in 2006: sensitivity to surface albedo, orography, SST and synoptic scale dry-air intrusions using WRF".CLIMATE DYNAMICS 38.3-4(2012):685-708.
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