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首页> 外文期刊>Journal of hydrometeorology >Intensification of Summer Rainfall Variability in the Southeastern United States during Recent Decades
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Intensification of Summer Rainfall Variability in the Southeastern United States during Recent Decades

机译：近几十年来美国东南部夏季降水变化的加剧

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摘要

The variability of summer precipitation in the southeastern United States is examined in this study using 60-yr (1948-2007) rainfall data. The Southeast summer rainfalls exhibited higher interannual variability with more intense summer droughts and anomalous wetness in the recent 30 years (1978-2007) than in the prior 30 years (1948-77). Such intensification of summer rainfall variability was consistent with a decrease of light (0.1-1 mm day(-1)) and medium (1-10 mm day(-1)) rainfall events during extremely dry summers and an increase of heavy (>10 mm day(-1)) rainfall events in extremely wet summers. Changes in rainfall variability were also accompanied by a southward shift of the region of maximum zonal wind variability at the jet stream level in the latter period. The covariability between the Southeast summer precipitation and sea surface temperatures (SSTs) is also analyzed using the singular value decomposition (SVD) method. It is shown that the increase of Southeast summer precipitation variability is primarily associated with a higher SST variability across the equatorial Atlantic and also SST warming in the Atlantic.
机译：本研究使用60年（1948-2007年）的降雨数据对美国东南部夏季降水的变化进行了研究。与过去30年（1948-77）相比，最近30年（1978-2007）东南夏季的降水表现出较高的年际变化，夏季干旱和异常湿度更为强烈。夏季降雨变异性的这种加剧与极端干旱的夏季期间少雨（0.1-1 mm day（-1））和中等（1-10 mm day（-1））降雨事件减少以及大雨（在极端潮湿的夏天发生10毫米日（-1））降雨事件。降雨变化的变化还伴随着后期喷流水平最大纬向风变化区域的南移。还使用奇异值分解（SVD）方法分析了东南夏季降水与海表温度（SST）之间的协变性。结果表明，东南夏季降水变异性的增加主要与整个赤道大西洋的海表温度变异性较高以及大西洋海表温度升高有关。

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