摘要: |
【目的】为了研究全球降水测量计划(GPM)综合多卫星检索降水产品(IMERG)在浙江省的适用性。【方法】以浙江省为研究区域,基于浙江省自动观测站降水数据,利用相关系数、均方根误差、相对偏差、分类指数统计法分别从年尺度、季尺度、月尺度、日尺度以及小时尺度GPM在浙江省的适用性。【结果】(1)春、秋、冬季的GPM和自动站对应效果远好于夏季,月尺度、日尺度、小时尺度下GPM和自动站降水数据对应效果较好,但整体上存在高值区略低估、低值区略高估现象;(2)年尺度与季尺度下GPM与自动站降水平均值的变化趋势一致,但GPM降水平均值较高,其中秋季表现最好;(3)年、月、日3个尺度下,尺度越精细化,相关系数越高、相对偏差越小,均方根误差越小;小时、日、月3个尺度下,降水阈值越低,产品尺度越粗糙,估测能力越高;降水阈值越低,产品尺度越精细,误报降水的比例越低;降水阈值越低,综合探测能力越高;(4)在小时尺度下,在0.5~1 mm·h-1区间,GPM虽然对降水事件略有高估,但拟合效果较好。【结论】综合来看,GPM日尺度降水数据产品精度在浙江省有较大应用潜力。 |
关键词: GPM;反演降水;适用性;浙江省;IMERG |
DOI: |
投稿时间:2022-11-03修订日期:2023-12-26 |
基金项目:衢州市科技局指导性科技攻关项目(2022115) |
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Research of GPM Data Applicability in Zhejiang Province |
zhengqian,GU Zhenhai,MA Yiyi,GONG Liqing,WANG Jianjiang |
(Quzhou Meteorological Administration) |
Abstract: |
To study the applicability of Global Precipitation Measurement Program (GPM) integrated multi-satellite Retrieval of Precipitation Product (IMERG) in Zhejiang Province, this article analyzes the applicability of GPM on the yearly, seasonal, monthly, daily and hourly scales in Zhejiang Province by using the correlation coefficient, root mean square error, relative deviation and classification index statistical methods as well as the precipitation data of the automatic weather stations in Zhejiang Province. The results show that: (1) The corresponding effects of GPM and automatic weather station data in spring, autumn and winter are far better than that in summer. The corresponding results of GPM and automatic station precipitation data on the monthly, daily and hourly scales are relatively better, but overall the high-value areas are slightly underestimated and the low-value areas are slightly overestimated. (2) On the yearly and seasonal scales, the variation trends of GPM and automatic station average precipitation are consistent, but the GPM precipitation average is higher, with the value for autumn is the best. (3) On the three scales of year, month and day, the finer the scale, the higher the correlation coefficient, the smaller the relative deviation, and the smaller the root mean square error. On the three scales of hour, day and month, the lower the precipitation threshold, the rougher the product scale, and the higher the estimation ability; the lower the precipitation threshold, the finer the product scale, and the lower the false alarm rate; the lower the precipitation threshold, the higher the comprehensive detection capability. (4) On the hourly scale, in the range of 0.5-1 mm·h-1, the GPM slightly overestimates the precipitation events, but the fitting effect is better. In summary, the GPM daily precipitation data has a bigger application potential in Zhejiang Province. |
Key words: global precipitation measurement (GPM); retrieved precipitation data; applicability; Zhejiang Province; integrated multi-satellite retrieval of precipitation products (IMERG) |