Title

Correction Of Time-Varying Radiometric Biases In The Trmm Microwave Imager

Keywords

Microave radiometry; Radiometric Calibration; TMI; TRMM

Abstract

This paper describes an empirical correction for a timevarying radiometric calibration error present in the Tropical Rainfall Measuring Mission (TRMM) Microwave Imager (TMI). The Tb error is modeled as a function of the spacecraft orbit position and solar angles based on observed systematic differences between the TMI 10 GHz vertically polarized (10V) channel oceanic Tb's as compared to a radiative transfer model with collocated numerical weather model environmental parameters. This correction technique will be implemented in Version 7 of the TRMM 1B11 data product, which is scheduled to be released in 2010. Available spacecraft in-flight thermal measurements that have relevence to the instrument performance are discussed. Results from thermal modeling of the spacecraft and instrument provide support for the emissive reflector model as the primary cause for the empirical Tb bias estimates. Residual differences between the thermal model and the bias estimates may provide evidence of smaller secondary effects from solar array shadowing of the instrument. © 2010 IEEE.

Publication Date

10-26-2010

Publication Title

11th Specialist Meeting on Microwave Radiometry and Remote Sensing of the Environment, MicroRad 2010 - Proceedings

Number of Pages

260-265

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1109/MICRORAD.2010.5559549

Socpus ID

77958089796 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/77958089796

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