Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1007/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
![]() |
ISSN | 0930-7575 |
EISSN | 1432-0894 |
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 |
推荐引用方式 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. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。