IMERG卫星降水产品在中国的干旱监测效用评估

S127; GPM(Global Precipitation Measurement)时代,高时空分辨率的IMERG(Integrated Multi-satellitE Retrievals for GPM)是最主流的卫星遥感反演降水产品.该研究以地面网格CPAP(China Gauge-based Monthly Precipitation Analysis Product)数据为基准资料,选用标准化降水指数(Standardized Precipitation Index,SPI)、标准化降水蒸散指数(Standardized Precipitation Evapotranspirati...

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Published in农业工程学报 Vol. 37; no. 2; pp. 161 - 169
Main Authors 卫林勇, 江善虎, 任立良, 张林齐, 王孟浩
Format Journal Article
LanguageChinese
Published 河海大学水文水资源学院,南京 210098%河海大学水文水资源学院,南京 210098 15.01.2021
河海大学水文水资源与水利工程科学国家重点实验室,南京 210098
Subjects
干旱
降水
CI
SPEI
中国
SPI
IMERG
Online AccessGet full text
ISSN1002-6819
DOI10.11975/j.issn.1002-6819.2021.2.019

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Abstract S127; GPM(Global Precipitation Measurement)时代,高时空分辨率的IMERG(Integrated Multi-satellitE Retrievals for GPM)是最主流的卫星遥感反演降水产品.该研究以地面网格CPAP(China Gauge-based Monthly Precipitation Analysis Product)数据为基准资料,选用标准化降水指数(Standardized Precipitation Index,SPI)、标准化降水蒸散指数(Standardized Precipitation Evapotranspiration Index,SPEI)和综合气象干旱指数(Composite Index of Meteorological Drought,CI),评价了最新版回顾性IMERG降水产品在干旱监测方面的应用能力及比较了其计算的干旱指数间的差异性.结果表明:1)IMERG能较好地捕捉中国月均降水量的空间格局;其与CPAP数据具有较高的一致性,相关系数高于0.9的区域占大陆面积的73.7％.2)基于IMERG的干旱指数具有良好的可靠性,它与CPAP计算结果的区域平均相关系数在大部分地区超过0.8.总体上,SPEI较SPI和CI的适用性更好.3)在西南地区,IMERG可准确再现干旱随时间的变化过程并捕获典型干旱事件的空间特征,同样SPEI表现优于SPI和CI.总之,回顾性IMERG降水产品在中国干旱监测中表现出很好的应用潜力,但不同干旱指数会影响它的精度.在全球变暖条件下,基于IMERG的SPEI指数应用于干旱监测与评估整体上优于仅考虑降水因子的SPI指数,以及考虑降水和气温因子的CI指数.
AbstractList S127; GPM(Global Precipitation Measurement)时代,高时空分辨率的IMERG(Integrated Multi-satellitE Retrievals for GPM)是最主流的卫星遥感反演降水产品.该研究以地面网格CPAP(China Gauge-based Monthly Precipitation Analysis Product)数据为基准资料,选用标准化降水指数(Standardized Precipitation Index,SPI)、标准化降水蒸散指数(Standardized Precipitation Evapotranspiration Index,SPEI)和综合气象干旱指数(Composite Index of Meteorological Drought,CI),评价了最新版回顾性IMERG降水产品在干旱监测方面的应用能力及比较了其计算的干旱指数间的差异性.结果表明:1)IMERG能较好地捕捉中国月均降水量的空间格局;其与CPAP数据具有较高的一致性,相关系数高于0.9的区域占大陆面积的73.7％.2)基于IMERG的干旱指数具有良好的可靠性,它与CPAP计算结果的区域平均相关系数在大部分地区超过0.8.总体上,SPEI较SPI和CI的适用性更好.3)在西南地区,IMERG可准确再现干旱随时间的变化过程并捕获典型干旱事件的空间特征,同样SPEI表现优于SPI和CI.总之,回顾性IMERG降水产品在中国干旱监测中表现出很好的应用潜力,但不同干旱指数会影响它的精度.在全球变暖条件下,基于IMERG的SPEI指数应用于干旱监测与评估整体上优于仅考虑降水因子的SPI指数,以及考虑降水和气温因子的CI指数.
Author 江善虎
任立良
王孟浩
张林齐
卫林勇
AuthorAffiliation 河海大学水文水资源与水利工程科学国家重点实验室,南京 210098;河海大学水文水资源学院,南京 210098%河海大学水文水资源学院,南京 210098
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Author_FL Jiang Shanhu
Ren Liliang
Wang Menghao
Zhang Linqi
Wei Linyong
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Keywords 干旱
降水
CI
SPEI
中国
SPI
IMERG
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Publisher 河海大学水文水资源学院,南京 210098%河海大学水文水资源学院,南京 210098
河海大学水文水资源与水利工程科学国家重点实验室,南京 210098
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