Climatic variations in Central America and the Caribbean
Climatic variations in Central America and the Caribbean
复制标题
中美洲和加勒比地区的气候变化
DOI：
10.1002/joc.3515
复制
发表时间：
2013
期刊：
影响因子：
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通讯作者：
D. Polzin
中科院分区：
文献类型：
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作者：
S. Hastenrath;D. Polzin
本研究在恢复早期工作的基础上，探讨了1921-1986年中美洲和加勒比地区降雨变化的环流机制。关于年际变率，相关分析表明，在大西洋一侧和东太平洋上空，温暖的地表水、低压、上升运动和弱信风有利于该区域的充足降雨，南风带增强，热带辐合带向北移位。在20世纪的过程中，该地区经历了从1931-1938年的潮湿到1939-1947年的干燥，从1950-1956年的潮湿到1971-1978年的干燥，在长期和相对极端的降雨状态之间的交替。从干到湿的环流型态的变化在年际变化的意义上是相关的，从湿到干的演变过程中环流型态的变化大致相反。不同的环流和降雨制度之间的交替反映在湖泊水位的变化中。该研究举例说明了一种新的流通数据集的信息价值。版权所有©2012英国皇家气象学会
Resuming earlier work, this study explores the circulation mechanisms of rainfall variations in Central America and the Caribbean during 1921–1986. Regarding interannual variability, correlation analysis shows as favourable for abundant rainfall in the region warm surface waters, low pressure, upward motion, and weak tradewinds on the Atlantic side and over the eastern Pacific enhanced southerlies and a northward displaced intertropical convergence zone. In the course of the twentieth century, the region experienced alternations between protracted and contrastingly extreme regimes of rainfall, from wet 1931–1938 to dry 1939–1947 to wet 1950–1956 to dry 1971–1978. Changes in circulation patterns from the dry to the wet regimes are in the sense of correlations in interannual variability, pattern changes being broadly inverse in the evolution from the wet to the dry regimes. The alternations between contrasting circulation and rainfall regimes are reflected in changing lake levels. The study exemplifies the information value of a novel circulation data set. Copyright © 2012 Royal Meteorological Society