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蔡敏, 张智. 2014: 河套地区大雨以上降水日数的气候变化特征分析. 暴雨灾害, 33(4): 401-406. DOI: 10.3969/j.issn.1004-9045.2014.04.013
引用本文: 蔡敏, 张智. 2014: 河套地区大雨以上降水日数的气候变化特征分析. 暴雨灾害, 33(4): 401-406. DOI: 10.3969/j.issn.1004-9045.2014.04.013
CAI Min, ZHANG Zhi. 2014: Characteristic analysis on climatological variation of precipitation days with heavy and above rain intensities overHetao region. Torrential Rain and Disasters, 33(4): 401-406. DOI: 10.3969/j.issn.1004-9045.2014.04.013
Citation: CAI Min, ZHANG Zhi. 2014: Characteristic analysis on climatological variation of precipitation days with heavy and above rain intensities overHetao region. Torrential Rain and Disasters, 33(4): 401-406. DOI: 10.3969/j.issn.1004-9045.2014.04.013

河套地区大雨以上降水日数的气候变化特征分析

Characteristic analysis on climatological variation of precipitation days with heavy and above rain intensities overHetao region

  • 摘要: 选取河套地区87 个气象站1961—2010 年逐日降水量资料,采用线性趋势分析、Morlet 小波分析等方法,分析河套地区大雨以上降水日数的时空分布特征其及气候变化规律。结果表明: 该地区大雨以上降水日数空间分布呈现“东南多、西北少”,其中,年均大雨以上降水日数超过5.0 d 的区域位于其东南部,包括山西南部、河南西北部和陕西东南部;该地区7 月、8 月、6—9 月及年大雨以上降水日数总体上均呈减少趋势,其日数变化具有明显的阶段性,大雨多发期和少发期交替出现;1985 年前后年均大雨以上降水日数在该地区不同区域存在增多和减少的区别;近50 a,该地区7 月、8 月、6—9 月和年大雨以上降水日数变化的周期性显著,其变化既存在明显的2~4 a 周期,也存在6~8 a 周期。

     

    Abstract: Based on the daily precipitation data from 87 meteorological stations over Hetao region from 1961 to 2010, we analyze the temporal-spatial distribution characteristics and the climatological variation features of precipitation days with heavy and above rain intensities(PDHR) over Hetao region by using linear trend and Morlet wavelet analysis methods. Results indicate that PDHR is clearly more in thesoutheast and less in northwest of Hetao. The annual mean PDHR being more than 5.0 days can be found in the southeastern Hetao, includingsouthern Shanxi, northwestern Henan and southeastern Shaanxi. Over Hetao region, the PDHRs in July, August, from June to September andwhole year all are in decrease trend in general, and the annual change of the precipitation days has a clear fluctuation in which high and lowfrequency periods of heavy rain alternately occur. The annual mean PDHR has reduced in some parts but increased in other parts before andafter 1985. In the last 50 years, PDHRs in July, August, from June to September and whole year all have clear fluctuating period of 2-4 years,as well as fluctuating period of 6-8 years over Hetao region.

     

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