The African Humid Period (∼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.

中文翻译：

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健壮的植被，土壤和湖泊的反馈使非洲潮湿时期的降水得以维持

非洲湿润时期（〜距今已有11,000-5,000年的时间）是几次进动步调的湿润间隔中的最新一次，在此期间北半球夏季入射太阳辐射的增加加剧了西非季风，导致北非发生了巨大变化。但是，仅日射异常是不够的，并且反馈对于季风的进一步放大至关重要。最重要的反馈来自土地表面，这是由于植被，土壤特性和地表水分布的变化而引起的。我们表明，与以前的研究探索这些反馈的个体影响相比，现代气候模型响应其集体效应而产生了更大的降水增加。与荒漠草原的过渡比以往任何研究都更向北推进，与代理的共识得到改善。在西非萨赫勒地区，夏季的日均强度和极端降水强度分别增加了150％和90％。