The arid northwest China is an undeveloped area in economy, being rich in mineral resources but shortage in water resources due to sparse rainfall and intense evaporation.
我国西北地区降水稀少，蒸发强烈，水资源贫乏，是矿产资源富饶的缺水贫困区。
The results show that the regional short-time heavy rainfall events in the east of Northwest China weather type have obvious seasonal characteristics and regional features.
结果表明：西北地区东部区域性短时强降水事件的天气型有明显的季节性特点和区域性特征。
Chen Dongdong, Dai Yongjiu. 2009a. Characteristics and analysis of typical anomalous summer rainfall patterns in Northwest China over the last 50 years[J]. Chinese J Atmos Sci, 33(6):1247-1258.
陈冬冬，戴永久。 2009a。 近五十年中国西北地区夏季降水场变化特征及影响因素分析[J]。大气科学，33（6）：1247-1258。
In recent 50 years in Northwest China, the total rainfall is mainly contributed by the stronger rain, which contributes 75% rainfall in 5% rainfall days;
结果表明：近五十年来， 中国西北地区降水以强降水为主，较强以上强度降水占总降水日数的5%， 但其降水量占总降水量75%；
In recent 50 years in Northwest China, the total rainfall is mainly contributed by the stronger rain, which contributes 75% rainfall in 5% rainfall days;
结果表明：近五十年来， 中国西北地区降水以强降水为主，较强以上强度降水占总降水日数的5%， 但其降水量占总降水量75%；
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