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暖湿背景下新疆逐时降水变化特征研究

, PP. 692-702

Keywords: 新疆,逐时降水频数,逐时降水量,日变化特征

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Abstract:

基于新疆16个国家基准站1991-2013年5~9月逐小时的降水观测资料,分析研究了新疆夏半年逐时降水的时空分布和日变化特征。结果表明:新疆小时降雨频数呈现西北多、东南少的特征;4mm·h-1以上量级雨强的强降雨高频时段北疆自西向东依次出现在下午、前半夜和后半夜,南疆多出现在夜间;新疆各区域逐时降水频率的日变化特征明显不同,各区域逐时降水分布并不均匀:塔城北部、阿勒泰地区日降水分布呈现双峰型特征,北疆其余地区则是较为一致的单峰型;南疆各区域以双峰型居多。南北疆0.1mm·h-1以上、4mm·h-1以上量级雨强的出现总频次均呈明显增加趋势,进入21世纪10年代南疆强降雨频次增加更显著。

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