SAHEL RAINFALL AND WORLDWIDE SEA TEMPERATURES, 1901-85
SAHEL RAINFALL AND WORLDWIDE SEA TEMPERATURES, 1901-85
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DOI：
10.1038/320602a0
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发表时间：
1986-04-17
期刊：
影响因子：
64.8
通讯作者：
PARKER, DE
中科院分区：
文献类型：
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作者：
FOLLAND, CK;PALMER, TN;PARKER, DE
利用全面质量控制的气象局历史海面温度数据集 (MOHSST)1,2，我们首次表明，非洲萨赫勒地区的持续湿润和干燥时期与近全球范围内海面温度 (SST) 异常的对比模式密切相关。这些异常现象包括半球之间海表温度的相对变化，时间尺度为数年至数十年，其中大西洋最为明显。 11级全球大气环流模型（AGCM）的实验支持了全球海温异常通过热带大气环流变化调节夏季萨赫勒降雨的观点3-6。厄尔尼诺事件也可能起到一定作用。我们并不低估萨赫勒地区土壤湿度和反照率变化的影响7,8，尽管Courelet等人9质疑反照率变化的重要性，但我们确实认为全球海温异常可能对萨赫勒降雨产生更根本的影响。
Using the comprehensively quality-controlled Meteorological Office Historical Sea Surface Temperature data set (MOHSST)1,2we show for the first time that persistently wet and dry periods in the Sahel region of Africa are strongly related to contrasting patterns of sea-surface temperature (SST) anomalies on a near-global scale. The anomalies include relative changes in SST between the hemispheres, on timescales of years to tens of years, which are most pronounced in the Atlantic. Experiments with an 11-level global atmospheric general circulation model (AGCM) support the idea that the worldwide SST anomalies modulate summer Sahel rainfall through changes in tropical atmospheric circulation3–6. El Niño events may also play a part. We do not discount the effects of soil moisture and albedo changes in the Sahel7,8, although Courelet al.9have questioned the importance of albedo changes, but we do suggest that worldwide SST anomalies may have a more fundamental influence on Sahel rainfall.