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中国东部夏季持续性降水日变化在淮河南北的差异分析

DOI: 10.6038/cjg20140306, PP. 752-759

Keywords: 降水日变化,持续性降水,南北差异

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Abstract:

本文利用1961—2006年我国285站观测的逐时降水数据,分析了中国东部不同地区夏季平均降水日变化随降水持续时间的变化特征.虽然整个东部地区都表现为短时降水峰值较一致地出现在下午17时左右,持续较长时间降水在清晨前后发生峰值降水,但持续性降水日变化的平均峰值时间以淮河为界存在显著南北差异.北部地区的持续性降水峰值主要出现在02—06时前后;南部地区的持续性降水峰值时间出现在06—10时.无论是降水强度或频次的日变化峰值的南北差异均较明显,但降水强度差异更为突出,且主要表现在持续性强降水中.进一步分析发现:一方面北部地区持续性强降水开始时间较南部地区更早;另一方面,北部地区降水从开始到峰值经历的时间更短.最后,对持续性强降水峰值时间南北差异的可能原因进行了初步讨论.

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