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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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基于CI指数的江苏省近50年干旱的时空分布规律
DOI: 10.11821/xb201105003, PP. 599-608
Keywords: 江苏省,气象干旱,复合指数(CI),GIS,时空变化规律
Abstract:
根据江苏省54个气象台站1960-2009年实测气象资料，利用气象干旱复合指数(compositeindex,CI)对江苏省近50年的干旱特征进行了时空分析。通过计算各站历年逐日的CI指数值，统计近50年各站点出现的干旱过程，分析江苏省各地区干旱发生的频率、范围和强度，揭示了江苏省干旱发生的时空分布规律。研究结果表明(1)江苏省全年和各季干旱发生频率都是北高南低，四季中，冬旱发生频率最高，夏旱发生频率最低，秋旱南北差异不显著。(2)冬季江苏省干旱大范围发生的年份最多，夏季最少；近50年来，全年和四季干旱覆盖范围的线性变化趋势不明显。(3)这50年中，江苏省逐年干旱持续日数和干旱强度虽然存在着明显的年际波动，但线性变化趋势不明显。(4)江苏省各等级干旱日数总体上呈现冬季多夏季少、北部多南部少的规律。
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