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首页> 外文期刊>Meteorology and Atmospheric Physics >Links between rainfall variability on intraseasonal and interannual scales over western Tanzania and regional circulation and SST patterns
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Links between rainfall variability on intraseasonal and interannual scales over western Tanzania and regional circulation and SST patterns

机译：坦桑尼亚西部季节内和年际尺度上降雨变化与区域环流和海表温度之间的联系

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This study investigates the circulation anomalies associated with the intraseasonal evolution of wet and dry years over western Tanzania (29–37° E, 11.5–4.75° S) and how the onset and withdrawal of the rainy season as well as its wet spell characteristics are modified. It is found that for wet years, the rains begin earlier and end later, with strong wet spells occurring during the season, and there tend to be a greater number of moderate wet spells (although not necessarily more intense wet spells) than in dry years. In dry years, late onset and early cessation of the rainy season occur, often with an extended dry spell soon after the onset, and there tend to be a greater number of dry spells within the season. Large negative outgoing long wave radiation (OLR) anomaly values tend to be located between 20° and 40° E with anomalous westerly flow at 850 hPa occurring across the continent from 10° E to the tropical western Indian Ocean during wet spells in the anomalously wet seasons. Anomalously dry seasons are characterised by large positive OLR anomalies over 30–50° E as well as easterly anomalies at 850 hPa and westerly anomalies at 200 hPa. Eastward propagating intraseasonal anomalies are slower during the wet years implying that the convection remains over Tanzania longer. On the intraseasonal scale, Hovmoeller analyses of OLR and 850 and 200 hPa zonal wind indicate that convection over western Tanzania may be associated with a flux of moisture from the tropical southeast Atlantic and Congo basin followed by weak easterlies from the tropical western Indian Ocean.
机译：这项研究调查了与坦桑尼亚西部（29-37°E，11.5-4.75°S）干湿年季节内演变相关的环流异常，以及雨季的开始和撤回以及其湿拼特征如何改性。结果发现，在潮湿的年份，降雨开始得较早，之后才结束，在该季节中出现了强烈的潮湿季节，并且与干燥年份相比，中等程度的潮湿季节（尽管不一定是更强烈的潮湿季节）往往会更多。 。在干旱年份，雨季起病较晚，雨季提前停止，通常在发病后不久便会出现较长的干旱期，并且在季节内往往会有更多的干旱期。较大的负长波辐射（OLR）异常值往往位于20°至40°E之间，在850 hPa时，西风从10°E到热带西印度洋遍及整个大陆，在异常潮湿的湿润期间发生了异常西风流季节。异常干燥季节的特征是，东经30–50°时出现大的OLR正异常，在850 hPa时出现东风异常，在200 hPa时出现西风异常。在潮湿年份，向东传播的季节内异常较慢，这意味着对流在坦桑尼亚的停留时间更长。在季节内尺度上，对OLR以及850和200 hPa纬向风的Hovmoeller分析表明，坦桑尼亚西部的对流可能与热带东南大西洋和刚果盆地的水汽通量有关，随后是热带西印度洋的弱东风。

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