张强,谢五三,陈鲜艳,翟盘茂,吴必文,段居琦. 2021. 基于MCI的长江中下游地区区域性干旱过程识别及其变化特征[J]. 气象学报, (0):-, doi:10.11676/qxxb2021.035
基于MCI的长江中下游地区区域性干旱过程识别及其变化特征
Identification and Assessment of Regional Drought Processes in Middle-lower Reaches of the Yangtze River Based on MCI
投稿时间:2020-12-24  修订日期:2021-03-02
DOI:10.11676/qxxb2021.035
中文关键词:  区域性干旱过程  识别  评估  MCI  长江中下游
英文关键词:regional drought process  identification  assessment  meteorological drought composite index  middle-lower reaches of the Yangtze River
基金项目:国家重点研发计划(2017YFC1502402);安徽省自然科学基金项目(1908085MD109);安徽省重点研究和开发计划(201904a07020099)
作者单位邮编
张强 国家气候中心 100081
谢五三 安徽省气候中心 230031
陈鲜艳 国家气候中心 100081
翟盘茂 中国气象科学研究院 100081
吴必文 安徽省气候中心 230031
段居琦 国家气候中心 100081
摘要点击次数: 28
全文下载次数: 24
中文摘要:
      基于长江中下游地区502个国家气象站1961-2019年逐日气温、降水资料以及1971-2019年历年干旱受灾面积,运用气象干旱综合指数(MCI)及区域性干旱过程识别方法,识别出长江中下游地区126次区域性干旱过程,干旱过程的个数随着持续天数的增加呈明显的指数递减,决定系数达0.95。1961~2019年长江中下游地区共发生6次特强区域性干旱过程、19次强区域性干旱过程、38次较强区域性干旱过程,其余63次为一般区域性干旱过程,区域性干旱过程的持续天数、平均强度、平均影响面积以及综合强度指数的变化趋势形态各异。长江中下游地区年干旱日数总体呈现“北部多于南部、平原多于山区”的分布特征,且总体呈现“西北部增多、东南部减少”的变化趋势,干旱日数与干旱受灾面积变化趋势较为一致,相关系数达0.66。由典型区域性干旱过程监测评估可知,干旱综合强度指数与干旱站数存在明显的负相关关系,干旱综合强度指数越强,各等级干旱站数越多;各地干旱日数的多少与干旱受灾面积的大小也较为一致,干旱日数越多的地区,干旱受灾面积越大。总体来看,区域性干旱过程识别方法及评估结果与干旱灾情较为吻合,能较好的识别出区域性干旱过程,并从持续天数、平均强度、平均影响面积以及干旱综合强度等多角度对干旱过程进行监测评估。
英文摘要:
      Based on the daily temperature and precipitation data of 502 national meteorological stations from 1961 to 2019 and the historical drought disaster information from 1971 to 2019 in middle-lower reaches of the Yangtze River, using meteorological drought composite index (MCI) and regional drought process identification method, this paper has identified 126 regional drought processes in middle-lower reaches of the Yangtze River. The number of drought processes decreases exponentially with the increase of duration days, and the determination coefficient reaches 0.95. From 1961 to 2019, there are 6 extremely strong regional drought processes, 19 strong regional drought processes and 38 sub strong regional drought processes in middle-lower reaches of the Yangtze River, and the remaining 63 are general regional drought processes, and the variation trend of duration days, average intensity, average affected area and comprehensive intensity index of regional drought processes present different forms. The distribution of annual drought days in middle-lower reaches of the Yangtze River is generally "more in the north than in the south, more in the plain than in the mountainous area", and the trend of "increasing in the northwest and decreasing in the southeast". The variation trend of drought days is consistent with that of drought affected area, and the correlation coefficient reaches 0.66. According to the monitoring and assessment of typical regional drought process, there is an obvious negative correlation between the comprehensive drought intensity index and the number of drought stations, the stronger the comprehensive drought intensity index is, the more drought stations of each grade are. The number of drought days in different regions is consistent with the size of drought disaster area. The more drought days, the greater the drought disaster area. In general, results of identification and assessment of regional drought process are consistent with drought disaster information. The method of identification and assessment of regional drought processes can well identify the regional drought process, and monitor and assessment the drought process from the perspectives of duration days, average intensity, average affected area and comprehensive drought intensity.
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