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Open AccessArticle

Assessing Radiometric Stability of the 17-Plus-Year TRMM Microwave Imager 1B11 Version-8 (GPM05) Brightness Temperature Product

Department of Electrical and Commuter Engineering, University of Central Florida, Orlando, FL 32816, USA
King Abdulaziz City for Science and Technology, Riyadh 11442, Saudi Arabia
Author to whom correspondence should be addressed.
Climate 2017, 5(4), 92;
Received: 31 October 2017 / Revised: 24 November 2017 / Accepted: 5 December 2017 / Published: 7 December 2017
PDF [7004 KB, uploaded 7 December 2017]


The NASA Tropical Rainfall Measuring Mission (TRMM) Microwave Imager (TMI) has produced a 17-plus-year time-series of calibrated microwave radiances that have remarkable value for investigating the effects of the Earth’s climate change over the tropics. Recently, the Global Precipitation Measurement (GPM) Inter-Satellite Radiometric Calibration (XCAL) Working Group have performed various calibration and corrections that yielded the legacy TMI 1B11 Version 8 (also called GPM05) brightness temperature product, which will be released in late 2017 by the NASA Precipitation Processing System. Since TMI served as the radiometric transfer standard for the TRMM constellation microwave radiometer sensors, it is important to document its accuracy. In this paper, the various improvements applied to TMI 1B11 V8 are summarized, and the radiometric calibration stability is evaluated by comparisons with a radiative transfer model and by XCAL evaluations with the Global Precipitation Measuring Microwave Imager during their 13-month overlap period. Evaluation methods will be described and results will be presented, which demonstrate that TMI has achieved a radiometric stability level of a few deciKelvin over almost two decades. View Full-Text
Keywords: TRMM; radiometric stability; TMI 1B11 V8 (GPM05); inter-satellite calibration TRMM; radiometric stability; TMI 1B11 V8 (GPM05); inter-satellite calibration

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Chen, R.; Alquaied, F.; Jones, W.L. Assessing Radiometric Stability of the 17-Plus-Year TRMM Microwave Imager 1B11 Version-8 (GPM05) Brightness Temperature Product. Climate 2017, 5, 92.

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