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中文摘要: 分析了黄河上游降水的时空变化及影响黄河上游降水的环流特征，指出河曲地区是黄河上游降水资源最丰富的地区。4月下旬到10月中旬河曲地区均可进行人工增雨作业，其中7月上旬和9月上旬是河曲地区人工增雨的最佳时期。
中文关键词: 降水分布，环流特征，人工增雨
Abstract:Analysis of spatial-temporal variation of precipitation in the upper reach of the Yellow River and its circulation characteristics are made. It shows that the bend region of the Yellow River is one of the area with richest precipitation in the upper reach of the Yellow River. The first ten days of July and the first ten days of September are the optimum periods of artificial precipitation enhancement over the bend region.
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引用文本：
许晨海,姚展予,陈进强,2004.黄河上游降水的时空变化及其环流特征[J].气象,30(11):51-54.
,2004.Analysis of Spatial-temporal Variation of Precipitation in the Upper Reach of the Yellow River and Its Circulation Characteristics[J].Meteor Mon,30(11):51-54.
许晨海,姚展予,陈进强,2004.黄河上游降水的时空变化及其环流特征[J].气象,30(11):51-54.
,2004.Analysis of Spatial-temporal Variation of Precipitation in the Upper Reach of the Yellow River and Its Circulation Characteristics[J].Meteor Mon,30(11):51-54.