CIMSS GOES-13 Science Activity Web Log.

This web page is kept for internal use as a historical record of past activities.
It is not a complete record of science activity at CIMSS.

GOES-13 Imager Band 6 (13.3um) SRFs revisited

April 02, 2009 After further analysis, the GOES-13 Imager Band 6 (13.3um) SRF has been changed again, this time by STAR (NOAA/NESDIS). NOAA/STAR has evaluated the original cold bias findings, and it has also analyzed a set of observational comparisons with both AIRS and IASI data during 2008. This has led to another update to the channel 6 SRFs which shifts the ITT updated SRFs by a further -2.1 cm-1 (towards longer wavelengths). Thus the STAR-updated SRFs have a total effective shift of about -3.3 cm-1 with respect to the original channel 6 SRFs. The STAR-updated SRFs are now the official operational SRFs for this band. They have been used for all GOES 13 Imager calibration processing after March 26, 2009.

GOES-13 Imager Band 6 (13.3um) SRF change

July 10, 2008

During the GOES-13 post-launch tests in 2006, a cold bias, -2.4±0.6 K, in Imager channel 6 (13.3 micrometer) was reported by University of Wisconsin. The cold bias was identified via comparisons with high-spectral Atmospheric InfraRed Sounder (AIRS) data, comparisons with broad-band High-resolution Infrared Radiation Sounder (HIRS) data on NOAA-15 and NOAA-16 and a limited number of forward model comparisons. The bias is consistent with a spectral response shift on the order of 4 cm-1 to the original spectral response function used in the ground system processing.

To respond to the GOES-13 Imager channel-6 cold bias, ITT re-evaluated the spectral response functions and came out with the updates which have an effective 1-wavenumber shift (shape was also changed). New Planck Function Coefficients, or band-correction coefficients, were calculated for this band. As well as central wavenumber, and full-width half-mass (FWHM) values.


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Revised - September 3, 2008.
URL: http://cimss.ssec.wisc.edu/goes13_blog