Influence of the Madden–Julian Oscillation on East African rainfall: II. March–May season extremes and interannual variability
Influence of the Madden–Julian Oscillation on East African rainfall: II. March–May season extremes and interannual variability
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马登-朱利安涛动对东非降雨量的影响：二、三月至五月季节极端事件和年际变化
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
P. Camberlin
中科院分区：
文献类型：
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作者：
B. Pohl;P. Camberlin
第一部分显示，马登-朱利安振荡（MJO）在候时间尺度上对东非的两个雨季都有重大影响。通过考虑较短（每日）和较长（年际）时间尺度，进一步研究了“长雨”（3月至5月）的情况。基于复合分析，极端日降雨事件在高原（西部）和沿海（东部）地区的赤道东非（肯尼亚和坦桑尼亚）提取。低层西风异常被认为是伴随着西部的潮湿事件和东部的东风。这些相反的环流异常优先发生在MJO的不同阶段，这表明后者对每日时间尺度的降雨有重大影响。
The Madden–Julian Oscillation (MJO) was shown in Part I to have a significant impact on both East African rainy seasons at pentad time‐scale. The case of the ‘long rains’ (March–May) is further examined by considering both shorter (daily) and longer (interannual) time‐scales. Based on composite analyses, extreme daily rainfall events in the Highland (west) and in the coastal (east) regions of Equatorial East Africa (Kenya and Tanzania) are extracted. Low‐level westerly wind anomalies are seen to accompany wet events in the west and easterly ones in the east. These opposite circulation anomalies preferentially occur at distinct phases of the MJO, which indicates that the latter has a major influence on rainfall at the daily time‐scale.