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暴雨灾害  2020, Vol. 39 Issue (3): 293-299    DOI: 10.3969/j.issn.1004-9045.2020.03.010
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GPM-IMERG日降水数据在内蒙古地区的适用性分析
曲学斌1,2, 付亚男2, 袁秀芝3, 谢晓丽2, 白明2
1. 中国气象局兰州干旱气象研究所/甘肃省干旱气候变化与减灾重点实验室/中国气象局干旱气候变化与减灾重点实验室, 兰州 730020;
2. 呼伦贝尔市气象局, 呼伦贝尔 021008;
3. 大兴安岭塔河县气象局, 大兴安岭 165200
Applicability analysis of GPM-IMERG daily precipitation data in Inner Mongolia
QU Xuebin1,2, FU Ya'nan2, YUAN Xiuzhi3, XIE Xiaoli2, BAI Ming2
1. Institute of Arid Meteorology, Key Laboratory of Arid Climate Change and Disaster Reduction in Gansu, Key Laboratory of Arid Climate Change and Disaster Reduction of China Meteorological Administration, Lanzhou 730000;
2. Hulun Buir Meteorological Bureau, Hulun Bui 021008;
3. Tahe Meteorological Bureau of Daxinganling, Daxinganling 165200
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摘要 利用2015-2017年GPM-IMERG逐日降水产品与内蒙古119个气象站点降水数据进行对比,分析GPM-IMERG的适用性,为其在内蒙古地区的应用研究提供科学依据。分析表明:(1)GPM-IMERG捕捉降水日的准确度为74.3%,忽略非降水日的准确度为85.5%,对晴雨判别的总体误差随纬度增加而增加。(2)GPM-IMERG在内蒙古地区平均误差为正和为负的站点数量大体相当,平均绝对误差为4.1 mm,空间上呈现出自东南向西北递减分布。(3)GPM-IMERG在少量降水时存在对降水量的高估,而在较大量级降水时存在对降水量的低估。当降水量大于等于25 mm时,GPM-IMERG比气象站点降水平均偏少30%以上。(4)各盟市GPM-IMERG与站点降水的相关系数均能通过0.01的显著性水平检验,其中赤峰市的相关系数最高、乌海市最低。不同季节中,夏季的相关系数最高而春季的相关系数最低。对于不同植被类型来说,高植被覆盖区的GPM-IMERG与站点降水的斜率更加接近1,且相关系数也更高。
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曲学斌
付亚男
袁秀芝
谢晓丽
白明
关键词GPM   日降水   内蒙古   适用性     
Abstract: The applicability of GPM-IMERG daily precipitation data is analysed by comparing daily precipitation data of GPM-IMERG and 119 meteorological stations in Inner Mongolia from 2015 to 2017, in order to provide scientific basis for the application of GPM-IMERG data in Inner Mongolia. Analysis shows that:(1) The accuracy of GPM-IMERG to capture precipitation days is 74.3%, and to ignore non-precipitation days is 85.5%. The overall error of GPM-IMERG for distinguishing precipitation and non-precipitation increases with latitude. (2) The number of stations with positive and negative average errors of GPM-IMERG precipitation in Inner Mongolia is approximately the same. The average absolute error is 4.1 mm. Spatially, it shows a decreasing distribution from southeast to northwest. (3) GPM-IMERG overestimates in low precipitation while underestimates in high precipitation. When the precipitation is greater than or equal to 25 mm, GPM-IMERG precipitation is 30% less than the precipitation of meteorological stations on average. (4) The correlation coefficients of GPM-IMERG precipitation and station precipitation can pass the significance test of 0.01 level in each city, among which, Chifeng City has the highest correlation coefficient and Wuhai City has the lowest. For different seasons, the correlation coefficient is the highest in summer and the lowest in spring. For different vegetation types, the slope of GPM-IMERG in high vegetation coverage area is closer to 1, and the correlation coefficient is also higher.
Key wordsGPM   daily precipitation   Inner Mongolia   applicability   
收稿日期: 2018-11-26;
基金资助:干旱气象科学研究基金项目(IAM201706);内蒙古气象科技创新项目(nmqxkjcx201825)
作者简介: 曲学斌,主要从事气象干旱和卫星遥感应用研究。E-mail:qxbtd@qq.com
引用本文:   
曲学斌, 付亚男, 袁秀芝,等 .2020. GPM-IMERG日降水数据在内蒙古地区的适用性分析[J]. 暴雨灾害, 39(3): 293-299.
QU Xuebin, FU Ya'nan, YUAN Xiuzhi, et al .2020. Applicability analysis of GPM-IMERG daily precipitation data in Inner Mongolia[J]. Torrential Rain and Disasters, 39(3): 293-299.
 
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