doi: 10.12013/qxyjzyj2021-042 |
IMERG卫星降水产品在我国梅雨极端降水期的适用性评估 |
Evaluation of the applicability of IMERG precipitation products during Meiyu extreme precipitation period of China |
摘要点击 663 全文点击 424 投稿时间:2021-09-05 修订日期:2021-11-24 |
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基金: 国家自然科学基金青年科学基金项目(编号:41905089). |
中文关键词: 降水反演,IMERG产品,误差,梅雨期,长江中下游 |
英文关键词: satellite-derived precipitation IMERG Meiyu period the middle and lower reaches of Yangtze River |
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引用:徐 凡,王 莹.2021,IMERG卫星降水产品在我国梅雨极端降水期的适用性评估[J].气象与减灾研究,44(4):280-289 |
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中文摘要: |
为考察GPM卫星降水产品IMERG在梅雨极端降水期的适用性,以中国自动气象站观测数据与CMORPH降水产品融合的逐时降水量网格数据集资料作为参考,采用均方根误差RMSE和平均绝对误差MAE统计指标,对IMERG卫星降水产品在长江中下游地区2020年梅雨极端降水期的适用性进行评估。结果表明:IMERG卫星降水产品整体上与实测结果趋势一致,对于12 h和24 h累计降水,在强降水区域易出现高估。反演的3 h累计降水与实际降水一致性较好,累计降水量大于20、50、80、100 mm四种情况下的RMSE和MAE平均值均为10 mm左右。 |
Abstract: |
In order to evaluate the applicability of global precision measurement (GPM) satellite precipitation product IMERG (integrated Multi satellitE retrievals for GPM) in Meiyu extreme precipitation period in China, the hourly precipitation grid data set of CMORPH (Climate Prediction Centers Morphing technology) precipitation product integrated by China automatic weather station was utilized as an observed reference.The applicability of IMERG precipitation products in Meiyu extreme precipitation period in the middle and lower reaches of the Yangtze River was evaluated by using the statistical methods of root mean square error (RMSE) and mean absolute error (MAE).The results showed that on the whole, the trend of IMERG precipitation product data was consistent with the observed data.For 12 h and 24 h accumulated precipitation, an overestimation may occur in the heavy precipitation areas.The performance for 3 h accumulated precipitation was excellent, with the averaged error of 10 mm for RMSE and MAE when the accumulated precipitation was greater than 20 mm, 50 mm, 80 mm, and 100 mm. |