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www.atmos-meas-tech-discuss.net/3/3277/2010/
doi:10.5194/amtd-3-3277-2010
© Author(s) 2010. This work is distributed
under the Creative Commons Attribution 3.0 License.
Possible shift of spectral response function of the MODIS 6.8 μm water vapor channel causing a cold bias up to 3 K
School of Earth and Environmental Sciences, Seoul National University, Seoul, 151–747, Korea
Abstract. The calibration of the Moderate-resolution Imaging Spectroradiometer (MODIS) 6.8 μm water vapor (WV) channel was assessed by comparing Terra/MODIS measurements with the WV channel brightness temperatures equivalent to Infrared Atmospheric Sounding Interferometer (IASI) measurements for June 2007 and December 2007. IASI spectral information was transferred to the Japanese Multifunctional Transport Satellite (MTSAT)-1R WV channel and then to the MODIS WV channel. Results indicate that the MODIS WV channel is biased low up to 3 K, likely caused by the shift of the spectral response function by about +11 cm−1. This finding is particularly important because the bias of −3 K can cause about +30% relative errors in the retrieval of upper tropospheric humidity (UTH). In other words, the current MODIS measurements may result in higher UTH values, showing relative errors up to +30%.
Discussion Paper (PDF, 528 KB) Interactive Discussion (Closed, 6 Comments) Final Revised Paper (AMT)
Notice on Discussion StatusCitation: Sohn, B. J., Kim, B.-R., and Lee, S.-S.: Possible shift of spectral response function of the MODIS 6.8 μm water vapor channel causing a cold bias up to 3 K, Atmos. Meas. Tech. Discuss., 3, 3277-3291, doi:10.5194/amtd-3-3277-2010, 2010. Bibtex EndNote Reference Manager XML
