Title

Correction Of Time-Varying Radiometric Errors In Trmm Microwave Imager Calibrated Brightness Temperature Products

Keywords

1B11; Radiometric calibration; reflector Tb bias; Tropical Rainfall Measuring Mission (TRMM) Microwave Imager (TMI); version 7

Abstract

This letter presents an empirical correction for a time-varying radiometric calibration error (2.5 K peak to peak) present in the Tropical Rainfall Measuring Mission (TRMM) Microwave Imager (TMI) 1B11 calibrated brightness temperature Tb data product. The Tb error is modeled as a function of the spacecraft orbit position and the Sun elevation above the orbit plane (solar beta angle) based on the observed systematic differences between the TMI 10-GHz vertically polarized (10-V) channel oceanic Tb's as compared to a radiative transfer model with collocated numerical weather model environmental parameters. Assuming a slightly emissive reflector, the errors in the other TMI channels are estimated from the 10-GHz error model. This method is evaluated using before- and after-correction comparisons of 1B11 data over the ocean and Amazon, and results show that this method effectively eliminates the time-varying calibration error. This correction technique will be implemented in version 7 of the TRMM 1B11 data product, which is scheduled to be released in 2010. © 2006 IEEE.

Publication Date

10-1-2010

Publication Title

IEEE Geoscience and Remote Sensing Letters

Volume

7

Issue

4

Number of Pages

851-855

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1109/LGRS.2010.2050135

Socpus ID

77958019552 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/77958019552

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