Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/joc.5924 |
The water cycle of the mid-Holocene West African monsoon: The role of vegetation and dust emission changes | |
Messori, Gabriele1,2,3; Gaetani, Marco4; Zhang, Qiang2,5; Zhang, Qiong2,5; Pausata, Francesco S. R.6 | |
2019-03-30 | |
发表期刊 | INTERNATIONAL JOURNAL OF CLIMATOLOGY |
ISSN | 0899-8418 |
EISSN | 1097-0088 |
出版年 | 2019 |
卷号 | 39期号:4页码:1927-1939 |
文章类型 | Article |
语种 | 英语 |
国家 | Sweden; France; Canada |
英文摘要 | During the mid-Holocene (6 kyr BP), West Africa experienced a much stronger and geographically extensive monsoon than in the present day. Changes in orbital forcing, vegetation and dust emissions from the Sahara have been identified as key factors driving this intensification. Here, we analyse how the timing, origin and convergence of moisture fluxes contributing to the monsoonal precipitation change under a range of scenarios: orbital forcing only; orbital and vegetation forcings (Green Sahara); orbital, vegetation and dust forcings (Green Sahara-reduced dust). We further compare our results to a range of reconstructions of mid-Holocene precipitation from palaeoclimate archives. In our simulations, the greening of the Sahara leads to a cyclonic water vapour flux anomaly over North Africa with an anomalous westerly flow bringing large amounts of moisture into the Sahel from the Atlantic Ocean. Changes in atmospheric dust under a vegetated Sahara shift the anomalous moisture advection pattern northwards, increasing both moisture convergence and precipitation recycling over the northern Sahel and Sahara and the associated precipitation during the boreal summer. During this season, under both the Green Sahara and Green Sahara-reduced dust scenarios, local recycling in the Saharan domain exceeds that of the Sahel. This points to local recycling as an important factor modulating vegetation-precipitation feedbacks and the impact of Saharan dust emissions. Our results also show that temperature and evapotranspiration over the Sahara in the mid-Holocene are close to Sahelian pre-industrial values. This suggests that pollen-based paleoclimate reconstructions of precipitation during the Green Sahara period are likely not biased by possible large evapotranspiration changes in the region. |
英文关键词 | dust Green Sahara mid-Holocene precipitation recycling water cycle African monsoon |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000465456400008 |
WOS关键词 | CLIMATE SIMULATIONS ; HUMID PERIOD ; VARIABILITY ; INSOLATION ; FEEDBACKS ; DYNAMICS ; SAHARA ; OCEAN ; TERMINATION ; CIRCULATION |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/181817 |
专题 | 气候变化 |
作者单位 | 1.Stockholm Univ, Dept Meteorol, Stockholm, Sweden; 2.Stockholm Univ, Bolin Ctr Climate Res, Stockholm, Sweden; 3.Uppsala Univ, Dept Earth Sci, Villavagen 16, S-75236 Uppsala, Sweden; 4.Sorbonne Univ, UVSQ, CNRS, LATMOS IPSL, Paris, France; 5.Stockholm Univ, Dept Phys Geog, Stockholm, Sweden; 6.Univ Quebec, Dept Sci Terre & Atmosphere, Montreal, PQ, Canada |
推荐引用方式 GB/T 7714 | Messori, Gabriele,Gaetani, Marco,Zhang, Qiang,et al. The water cycle of the mid-Holocene West African monsoon: The role of vegetation and dust emission changes[J]. INTERNATIONAL JOURNAL OF CLIMATOLOGY,2019,39(4):1927-1939. |
APA | Messori, Gabriele,Gaetani, Marco,Zhang, Qiang,Zhang, Qiong,&Pausata, Francesco S. R..(2019).The water cycle of the mid-Holocene West African monsoon: The role of vegetation and dust emission changes.INTERNATIONAL JOURNAL OF CLIMATOLOGY,39(4),1927-1939. |
MLA | Messori, Gabriele,et al."The water cycle of the mid-Holocene West African monsoon: The role of vegetation and dust emission changes".INTERNATIONAL JOURNAL OF CLIMATOLOGY 39.4(2019):1927-1939. |
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