GPM和TRMM卫星与海洋定点浮标观测降水日变化的比较

汪亦蕾

doi:10.3969/j.issn.1001-909X.2020.01.002

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海洋学研究 ›› 2020, Vol. 38 ›› Issue (1) : 9-19. DOI: 10.3969/j.issn.1001-909X.2020.01.002

研究论文

GPM和TRMM卫星与海洋定点浮标观测降水日变化的比较

汪亦蕾

作者信息 +

Comparison of the diurnal cycle between Global Precipitation Measurement and Tropical Rainfall Measurement Mission datasets with rain gauge data from ocean buoys

WANG Yilei

Author information +

文章历史 +

摘要

基于热带大洋地区共23个海洋定点浮标雨量器数据比较了GPM和TRMM两种卫星降水数据(IMERG和TMPA)对热带海洋降水日变化的观测能力,选取时间为2014年4月1日—2018年4月30日。相较于浮标观测结果,2种卫星数据都低估了降水日变化范围。在太平洋和印度洋,IMERG和TMPA都能捕捉到降水极大值出现在早上、极小值出现在傍晚的特征,与浮标观测结果基本吻合。在大西洋,两种卫星数据与浮标观测的降水日变化特征有较大差异,主要是由于大西洋降水较少,而卫星对小降水的观测存在较大偏差,同时浮标观测在小降水区域更容易存在误差。

Abstract

Diurnal cycle in two satellite-derived precipitation datasets(IMERG and TMPA) based on both Global Precipitation Measurement (GPM) and Tropical Rainfall Measuring Mission (TRMM) are compared with data obtained from 23 rain gauges mounted on floating buoys in the tropics for the period 1 April, 2014 to 30 April, 2018. The results show that both satellites underestimate the ranges of precipitation diurnal variations. In the Pacific Ocean and the Indian Ocean, both IMERG and TMPA observe the rainfall maximum in the early morning and the minimum in the evening, which are consistent with the rain gauge buoys. However, in the tropical Atlantic, both satellite datasets show quite different patterns of the diurnal cycle from the rain gauge buoys, which is due to little precipitations over the Atlantic Ocean leading to large biases in both satellites and rain gauge buoys.

导出引用

汪亦蕾. GPM和TRMM卫星与海洋定点浮标观测降水日变化的比较[J]. 海洋学研究. 2020, 38(1): 9-19 https://doi.org/10.3969/j.issn.1001-909X.2020.01.002

WANG Yilei. Comparison of the diurnal cycle between Global Precipitation Measurement and Tropical Rainfall Measurement Mission datasets with rain gauge data from ocean buoys[J]. Journal of Marine Sciences. 2020, 38(1): 9-19 https://doi.org/10.3969/j.issn.1001-909X.2020.01.002

中图分类号： P412.27

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