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冰川冻土  2013 

宁夏春、夏、秋季干旱与降水集中期及集中度的关系

DOI: 10.7522/j.issn.1000-0240.2013.0114, PP. 1015-1021

Keywords: 宁夏,干旱,降水集中期,降水集中度,关系

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Abstract:

应用宁夏气象台站1961-2010年逐候降水量序列资料,计算了春、夏、秋季3个季降水的集中期、集中度和干旱Z指数,运用趋势分析、相关分析、合成分析讨论了3季的集中期、集中度与旱涝程度的时空变化特征及其相互关系.结果表明50a来宁夏春夏秋干旱等级均呈加剧趋势,秋季加剧更明显,3季中中部干旱带加剧最严重,南部山区次之,北部最小.春季集中期无明显变化趋势,但集中度有上升趋势,夏季集中期、集中度缓慢下降,秋季集中期、集中度变化不明显;近10a来3季集中度明显增大,春夏两季集中期推迟.春季降水集中度对干旱没有显著影响,但首场透雨出现早晚对干旱影响显著,透雨出现偏早,干旱等级低,反之亦然;夏季集中期对干旱影响不显著,但集中度显著影响干旱,集中度高,雨涝发生概率越大,集中度低,干旱发生概率大;秋季集中期、集中度对干旱都有影响,集中度高,集中期早,雨涝发生概率大,反之干旱出现概率大.

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