Water Vapor–Forced Greenhouse Warming over the Sahara Desert and the Recent Recovery from the Sahelian Drought
Water Vapor–Forced Greenhouse Warming over the Sahara Desert and the Recent Recovery from the Sahelian Drought
复制标题
水蒸气迫使撒哈拉沙漠温室变暖以及萨赫勒干旱的近期恢复
DOI：
10.1175/jcli-d-14-00039.1
复制
发表时间：
2015
影响因子：
4.9
通讯作者：
A. Saci
中科院分区：
文献类型：
--
作者：
A. Evan;C. Flamant;C. Lavaysse;C. Kocha;A. Saci
西非萨赫勒地区在干旱和多雨之间经历了十年的波动，大量研究断言，西非季风的这些变化是对热带大西洋和印度洋温度变化的反应。然而，这里表明，当仅由海温强迫时，大多数最先进的气候模型不能再现过去30年萨赫勒降水量在统计上显著上升的趋势，而那些降雨量显著上升趋势的模式似乎出于不同的原因实现了这一结果。这里考察了撒哈拉低热(SHL)在20世纪80年代萨赫勒干旱恢复过程中的作用。通过观测和再分析，证明SHL温度有上升趋势，这与干旱的恢复是一致的。对SHL的热量和水分收支分析表明，气温上升是由于水蒸气导致的温室效应，但这种变化…
AbstractThe Sahel region of West Africa experiences decadal swings between periods of drought and abundant rainfall, and a large body of work asserts that these variations in the West African monsoon are a response to changes in the temperatures of the tropical Atlantic and Indian Oceans. However, here it is shown that when forced by SST alone, most state-of-the-art climate models do not reproduce a statistically significant upward trend in Sahelian precipitation over the last 30 years and that those models with a significant upward trend in rainfall seem to achieve this result for disparate reasons. Here the role of the Saharan heat low (SHL) in the recovery from the Sahelian drought of the 1980s is examined. Using observations and reanalyses, it is demonstrated that there has been an upward trend in SHL temperature that is coincident with the drought recovery. A heat and moisture budget analysis of the SHL suggests that the rise in temperature is due to greenhouse warming by water vapor, but that change...