Multi-scale accuracy assessment of multiple high spatial and temporal resolution precipitation products in the Pearl River Delta region

MAI Qiying; TAN Xuezhi; WU Xinxin; LIU Bingjun; YANG Fang; ZHANG Mingzhu; WEN Deping; MA Haiqing

doi:10.13471/j.cnki.acta.snus.2022D083

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Multi-scale accuracy assessment of multiple high spatial and temporal resolution precipitation products in the Pearl River Delta region

Research articles | 更新时间：2024-05-30

- Multi-scale accuracy assessment of multiple high spatial and temporal resolution precipitation products in the Pearl River Delta region
- Acta Scientiarum Naturalium Universitatis Sunyatseni Vol. 63, Issue 3, Pages: 21-31(2024)
- 作者机构：
  
  1.中山大学土木工程学院，广东珠海 519082
  2.珠江水利委员会珠江水利科学研究院，广东广州 510611
  3.广州市水务科学研究所，广东广州 510220
  4.青海省水旱灾害防御服务中心，青海西宁 810001
  5.乌兰察布市水利事业发展中心，内蒙古乌兰察布 012000
- 作者简介：
- 基金信息：
- DOI：10.13471/j.cnki.acta.snus.2022D083
  CLC： P339
- Published：25 May 2024，
  
  Published Online：21 February 2024，
  
  Received：10 November 2022，
  
  Accepted：31 March 2023
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麦杞莹,谭学志,吴欣欣等.多个高时空分辨率降水产品在珠江三角洲地区的多尺度精度评估[J].中山大学学报(自然科学版)(中英文),2024,63(03):21-31.

MAI Qiying,TAN Xuezhi,WU Xinxin,et al.Multi-scale accuracy assessment of multiple high spatial and temporal resolution precipitation products in the Pearl River Delta region[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2024,63(03):21-31.
麦杞莹,谭学志,吴欣欣等.多个高时空分辨率降水产品在珠江三角洲地区的多尺度精度评估[J].中山大学学报(自然科学版)(中英文),2024,63(03):21-31. DOI： 10.13471/j.cnki.acta.snus.2022D083.

MAI Qiying,TAN Xuezhi,WU Xinxin,et al.Multi-scale accuracy assessment of multiple high spatial and temporal resolution precipitation products in the Pearl River Delta region[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2024,63(03):21-31. DOI： 10.13471/j.cnki.acta.snus.2022D083.

摘要

基于2001—2012年珠江三角洲地区28个雨量站逐时实测降水数据，通过计算6个统计指标和研究不同降水事件的出现频率，分别在年、月和日3个尺度上评估了3种降水产品CMORPH、GPM和ERA5在珠江三角洲地区的精度。结果发现：① 对比年、月、日3个时间尺度，3种降水产品在月尺度上均表现出与实测降水数据存在高度正线性关系，而在年和日尺度上的相关关系较弱；② 日尺度下3种降水产品汛期的表现均比非汛期差，在干燥月份对降水事件的探测准确度较其他月份低，但误报率却是秋冬季较高，且沿海附近站点的误报率均较内陆站点高；③ 相较之下，GPM更能准确地反映出珠江三角洲地区降水量的时空变化趋势和空间分布特征；④ CMORPH和GPM对各类型降水事件的估计能力均较好，能较好地反映实测降水数据对不同类型降水事件的贡献。总体而言，3种产品中，GPM最能反映珠江三角洲地区实际降水情况。

Abstract

Based on hourly precipitation data from 28 rainfall stations in the Pearl River Delta （PRD） region from 2001 to 2012，the accuracy of CMORPH，GPM and ERA5 is evaluated in the PRD on the annual，monthly and daily time scales by calculating 6 statistical metrics and exploring the frequency of different precipitation events. The results show that：（1） Compared with the three time scales of year，month and day，three products showed a highly positive correlation with the measured rainfall station on the monthly scale，but the correlation is weak on the annual and daily scales. （2） At the daily scale，all three precipitation products perform worse in the flood season than in the non-flood season. They are less accurate in detecting precipitation events in dry months than in other months，but the false alarm rate is higher in autumn and winter，and they all have a higher false alarm rate for stations near the coast than for inland stations. （3） In contrast，GPM can more accurately reflect the spatio-temporal trend and spatial distribution characteristics of precipitation in the PRD region. （4） Both CMORPH and GPM show high capacity to estimate various types of precipitation events，which can well reflect the contribution of the measured data to different types of precipitation events. Overall，GPM can best reflect the actual situation in the PRD region among the three products.

关键词

降水精度评估CMORPHGPMERA5珠江三角洲

Keywords

precipitation accuracy assessmentCMORPHGPMERA5the Pearl River Delta

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