African Humid Period Precipitation Sustained by Robust Vegetation, Soil, and Lake Feedbacks
African Humid Period Precipitation Sustained by Robust Vegetation, Soil, and Lake Feedbacks
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DOI：
10.1029/2020gl088728
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发表时间：
2020-11-16
影响因子：
5.2
通讯作者：
Peltier, W. Richard
中科院分区：
文献类型：
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作者：
Chandan, Deepak;Peltier, W. Richard
非洲湿润期（类似于距今11，000 - 5，000年）是几个岁差节奏湿润间隔中最近的一个，在此期间，北方半球夏季太阳辐射的增加加剧了西非季风，导致北方非洲发生了巨大变化。然而，单独的太阳辐射异常是不够的，反馈是必要的进一步放大季风。最重要的反馈来自地表，来自植被、土壤特性和地表水分布的变化。我们表明，与以前的研究，探讨了这些反馈的个人影响，现代气候模型产生了更大的降水量增加，以响应其集体效应。与代理协议的改善，而沙漠草原的过渡比以往任何研究进一步向北推进。在西非萨赫勒地区，夏季日平均和极端降水强度分别增加了150%和90%。
The African Humid Period (similar to 11,000-5,000 years before present) was the most recent of several precessionally paced wet intervals during which an increase in the Northern Hemisphere summer incoming solar radiation intensifies the West African Monsoon leading to dramatic changes over northern Africa. However, insolation anomaly alone is not sufficient and feedbacks are essential for further amplification of the monsoon. The most significant feedbacks derive from the land surface, arising from changes to vegetation, soil properties, and distribution of surface water. We show that in contrast to previous studies that have explored the individual impacts of these feedbacks, a modern climate model yields a much greater increase in precipitation in response to their collective effect. Agreement with proxies is improved while the desert-steppe transition is pushed further northward than in any previous study. In the West African Sahel, intensities of summer daily mean and extreme precipitation increase by 150% and 90%, respectively.