| GPM IMERG和ERA5降水数据精度在云南复杂地形区域的评估检验 |
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| 引用本文： | 赵平伟,李斌,王佳妮,杨宏庆,郭萍,龚丽军.GPM IMERG和ERA5降水数据精度在云南复杂地形区域的评估检验[J].气象科技,2021,49(1):114-123. |
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| 作者姓名： | 赵平伟 李斌 王佳妮 杨宏庆 郭萍 龚丽军 |
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| 作者单位： | 云南省临沧市气象局，临沧 677099 |
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| 基金项目： | 国家自然科学基金项目(41165004)、云南省临沧市气象局“短平快”科研项目资助 |
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| 摘 要： | 为评估和对比GPM IMERG、ERA5降水数据在云南的适用性,利用2014年4月至2018年6月的地面气象观测数据、GPM IMERG卫星遥感降水产品和ERA5再分析降水数据,采用定量和分类评分7项指标评估GPM IMERG和ERA5日降水产品在云南的适用性。结果表明:2种数据存在小雨日雨量高估,中雨及以上量级雨日雨量低估的问题,ERA5数据更为突出,小雨日居多导致降水整体高估;GPM IMERG数据空、漏报并存,ERA5则高空报、低漏报严重;小雨日较多(较少)的区域2种数据易出现高漏报(空报);不同雨强区间GPM IMERG秋季降水数据精度最高,冬季存在低雨强低估,高雨强高估的不同表现;20mm/d以下中低雨强段上2种降水数据与地面站点数据误差较小,雨强变大,误差增大,雨强大于20mm/d时,2种数据随雨强增大与站点偏差差异更为显著;随坡度和起伏度增大2种降水数据精度呈变差趋势;多项指标评估表明GPM IMERG降水数据在云南具有更高精度。研究结果为应用和开展农业、水利、水文、气象等相关学科研究提供参考依据。
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| 关 键 词： | GPM IMERG ERA5 不同量级雨日 精度评估 云南 |
| 收稿时间： | 2019/12/2 0:00:00 |
| 修稿时间： | 2020/9/7 0:00:00 |
Accuracy Evaluation and Comparison of GPM IMERG and ERA5 Precipitation Products over Complex Terrain of Yunnan |
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| ZHAO Pingwei,LI Bin,WANG Jiani,YANG Hongqing,GUO Ping,GONG Lijun.Accuracy Evaluation and Comparison of GPM IMERG and ERA5 Precipitation Products over Complex Terrain of Yunnan[J].Meteorological Science and Technology,2021,49(1):114-123. |
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| Authors: | ZHAO Pingwei LI Bin WANG Jiani YANG Hongqing GUO Ping GONG Lijun |
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| Institution: | Lincang Meteorologica Service, Yunnan, Linchang 677099 |
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| Abstract: | The uncertainty of the satellite precipitation products limits their applicability in complex terrain areas.This paper evaluates the applicability of the new rainfall products,GPM(Global Precipitation Measurement)IMERG(Integrated Multi-satellitE Retrievals for GPM)and ERA5precipitation in Yunnan Province area based on the meteorological data.The data of a total of 125weather stations from April 2014 to June 2018are used to evaluate and compare the accuracies of GPM IMERG and ERA5.The correlation coefficient(R),root mean square error(RMSE),relative bias(BIAS),Mean Absolute Error(MAE)and the classification statistical analysis indexes(POD,FAR,CIS)are used to assess the applicability of GPM IMERG and ERA5.The result shows that:The two kinds of data have the problems of overestimation of daily precipitation of light rainfall and underestimation of daily precipitation of moderate and above rainfall,and ERA5data is more prominent in this respect.GPM IMERG data have both higher false and missing alarm rates,while ERA5data have seriously higher and lower missing rate,especially in light rain days.The areas with more(less)light rain days are in good agreement with the two areas with higher missing(false)rates.In autumn,the precipitation data accuracy of GPM IMERG is the highest in different rain intensity ranges.In winter,there are different performances:underestimation of low rain intensity and overestimation of high rain intensity.For the medium and low rainfall intensity of below 20mm/d,the errors between the two precipitation data and ground station data are relatively small,and the errors increase with the increasing rain intensity.When the rain intensity is greater than 20mm/d,the difference between the two data and the station increases more significantly with the increasing rain intensity.With the increase of slope and fluctuation,the accuracy of two kinds of precipitation data presents a trend of deterioration.The evaluation indexes show that GPM IMERG precipitation data have higher accuracy in Yunnan.The research results provide a reference for the application and development of agriculture,water conservancy,hydrology,meteorology and other related disciplines. |
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| Keywords: | GPM IMERG ERA5 precipitation product accuracy evaluation Yunnan |
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