Influence of Soil Moisture on the Asian and African Monsoons. Part I: Mean Monsoon and Daily Precipitation
Influence of Soil Moisture on the Asian and African Monsoons. Part I: Mean Monsoon and Daily Precipitation
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DOI：
10.1175/1520-0442(2001)014
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发表时间：
2001-06
影响因子：
4.9
通讯作者：
H. Douville;F. Chauvin;H. Broqua
中科院分区：
文献类型：
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作者：
H. Douville;F. Chauvin;H. Broqua
摘要 土壤湿度对降水变化有响应，但也通过蒸发影响降水。这种双向相互作用通常被称为正反馈，因为在降水事件期间添加到陆地表面的水会导致蒸发增加，而这反过来又会导致更多降雨。各种数值实验表明，这种反馈对从天气尺度到年际尺度的热带气候变化有重大影响。在本研究中，进行了季节性模拟集合（3月 - 9月），以研究亚洲和非洲季风降雨对区域土壤湿度异常的敏感性。在进行了一次土壤湿度自由变化的对照实验之后，还进行了其他模拟集合，其中在有限区域（南亚或苏丹 - 萨赫勒地区）对土壤含水量进行了严格限制。除了理想化的模拟（其中土壤湿度受萎蔫点的值限制……）
Abstract Soil moisture responds to precipitation variability but also affects precipitation through evaporation. This two-way interaction has often been referred to as a positive feedback, since the water added to the land surface during a precipitation event leads to increased evaporation, and this in turn can lead to further rainfall. Various numerical experiments have suggested that this feedback has a major influence on tropical climate variability from the synoptic to the interannual timescale. In the present study, ensembles of seasonal simulations (March–September) have been performed in order to investigate the sensitivity of the Asian and African monsoon rainfall to regional soil moisture anomalies. After a control experiment with free-running soil moisture, other ensembles have been performed in which the soil water content is strongly constrained over a limited area, either south Asia or Sudan–Sahel. Besides idealized simulations in which soil moisture is limited by the value at the wilting poi...