TY - GEN
T1 - Estimation of uncertainties in the spectral response function of the water vapor channel of a meteorological imager
AU - Ahn, Myoung Hwan
AU - Lee, Su Jeong
AU - Kim, Dohyeong
N1 - Publisher Copyright:
© 2015 Copyright SPIE.
PY - 2015
Y1 - 2015
N2 - The five channel meteorological imager (MI) on-board the geostationary Communication, Ocean, and Meteorological Satellite (COMS) of Korea has been operationally used since April 2011. For a better utilization of the MI data, a rigorous characterization of the four infrared channel data has been conducted using the GSICS (Global Space-based Inter-Calibration System) approach with the IASI (Infrared Atmospheric Sounding Interferometer) on-board the European Metop satellite as the reference instrument. Although all four channels show the uncertainty characteristics that are in line with the results from both the ground tests and the in-orbit-test, there shows an unexpected systematic bias in the water vapor channel of MI, showing a cold bias at the warm target temperature and a warm bias with the cold target temperature. It has been shown that this kind of systematic bias could be introduced by the uncertainties in the spectral response function (SRF) of the specific channel which is similar to the heritage instruments on-board GOES series satellite. An extensive radiative transfer simulation using a radiative transfer model has confirmed that the SRF uncertainty could indeed introduce such a systematic bias. By using the collocated data set consisting of the MI data and the hyperspectral IASI data, the first order correction value for the SRF uncertainty is estimated to be about 2.79 cm-1 shift of the central position of the current SRF.
AB - The five channel meteorological imager (MI) on-board the geostationary Communication, Ocean, and Meteorological Satellite (COMS) of Korea has been operationally used since April 2011. For a better utilization of the MI data, a rigorous characterization of the four infrared channel data has been conducted using the GSICS (Global Space-based Inter-Calibration System) approach with the IASI (Infrared Atmospheric Sounding Interferometer) on-board the European Metop satellite as the reference instrument. Although all four channels show the uncertainty characteristics that are in line with the results from both the ground tests and the in-orbit-test, there shows an unexpected systematic bias in the water vapor channel of MI, showing a cold bias at the warm target temperature and a warm bias with the cold target temperature. It has been shown that this kind of systematic bias could be introduced by the uncertainties in the spectral response function (SRF) of the specific channel which is similar to the heritage instruments on-board GOES series satellite. An extensive radiative transfer simulation using a radiative transfer model has confirmed that the SRF uncertainty could indeed introduce such a systematic bias. By using the collocated data set consisting of the MI data and the hyperspectral IASI data, the first order correction value for the SRF uncertainty is estimated to be about 2.79 cm-1 shift of the central position of the current SRF.
KW - GSICS
KW - IASI
KW - Meteorological Imager
KW - Spectral Response Function
UR - http://www.scopus.com/inward/record.url?scp=84938929078&partnerID=8YFLogxK
U2 - 10.1117/12.2192518
DO - 10.1117/12.2192518
M3 - Conference contribution
AN - SCOPUS:84938929078
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Third International Conference on Remote Sensing and Geoinformation of the Environment, RSCy 2015
A2 - Michaelides, Silas
A2 - Hadjimitsis, Diofantos G.
A2 - Themistocleous, Kyriacos
A2 - Papadavid, Giorgos
PB - SPIE
T2 - 3rd International Conference on Remote Sensing and Geoinformation of the Environment, RSCy 2015
Y2 - 16 March 2015 through 19 March 2015
ER -