Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JCLI-D-15-0877.1 |
Soil Moisture Influence on Seasonality and Large-Scale Circulation in Simulations of the West African Monsoon | |
Berg, Alexis1; Lintner, Benjamin2; Findell, Kirsten3; Giannini, Alessandra1 | |
2017-04-01 | |
发表期刊 | JOURNAL OF CLIMATE
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ISSN | 0894-8755 |
EISSN | 1520-0442 |
出版年 | 2017 |
卷号 | 30期号:7 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Prior studies have highlighted West Africa as a regional hotspot of land-atmosphere coupling. This study focuses on the large-scale influence of soil moisture variability on the mean circulation and precipitation in the West African monsoon. A suite of six models from the Global Land-Atmosphere Coupling Experiment (GLACE)-CMIP5 is analyzed. In this experiment, model integrations were performed with soil moisture prescribed to a specified climatological seasonal cycle throughout the simulation, which severs the two-way coupling between soil moisture and the atmosphere. Comparison with the control (interactive soil moisture) simulations indicates that mean June-September monsoon precipitation is enhanced when soil moisture is prescribed. However, contrasting behavior is evident over the seasonal cycle of the monsoon, with core monsoon precipitation enhanced with prescribed soil moisture but early-season precipitation reduced, at least in some models. These impacts stem from the enhancement of evapotranspiration at the dry poleward edge of the monsoon throughout the monsoon season, when soil moisture interactivity is suppressed. The earlyseason decrease in rainfall with prescribed soil moisture is associated with a delayed poleward advancement of the monsoon, which reflects the relative cooling of the continent from enhanced evapotranspiration, and thus a reduced land-ocean thermal contrast, prior to monsoon onset. On the other hand, during the core/late monsoon season, surface evaporative cooling modifies meridional temperature gradients and, through these gradients, alters the large-scale circulation: the midlevel African easterly jet is displaced poleward while the low-level westerlies are enhanced; this enhances precipitation. These results highlight the remote impacts of soil moisture variability on atmospheric circulation and precipitation in West Africa. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000399678400002 |
WOS关键词 | SEA-SURFACE TEMPERATURE ; SAHEL RAINFALL ; PRECIPITATION FEEDBACK ; REGIONAL CLIMATE ; EASTERLY JET ; VARIABILITY ; IMPACT ; IRRIGATION ; MIDHOLOCENE ; MODEL |
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/20694 |
专题 | 气候变化 |
作者单位 | 1.Columbia Univ, Earth Inst, Int Res Inst Climate & Soc, Palisades, NY 10964 USA; 2.Rutgers State Univ, Dept Environm Sci, New Brunswick, NJ 08903 USA; 3.NOAA, Geophys Fluid Dynam Lab, Princeton, NJ USA |
推荐引用方式 GB/T 7714 | Berg, Alexis,Lintner, Benjamin,Findell, Kirsten,et al. Soil Moisture Influence on Seasonality and Large-Scale Circulation in Simulations of the West African Monsoon[J]. JOURNAL OF CLIMATE,2017,30(7). |
APA | Berg, Alexis,Lintner, Benjamin,Findell, Kirsten,&Giannini, Alessandra.(2017).Soil Moisture Influence on Seasonality and Large-Scale Circulation in Simulations of the West African Monsoon.JOURNAL OF CLIMATE,30(7). |
MLA | Berg, Alexis,et al."Soil Moisture Influence on Seasonality and Large-Scale Circulation in Simulations of the West African Monsoon".JOURNAL OF CLIMATE 30.7(2017). |
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