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

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

Abstract

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.

Key words: Global Precipitation Measurement, Tropical Rainfall Measurement Mission, ocean rain gauge buoys, diurnal cycle of precipitation

CLC Number:

P412.27

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.

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