From Event: SPIE Optical Engineering + Applications, 2016
We compare AIRS, IASI-A and CrIS under the cold conditions encountered in the daily overpasses of Dome Concordia, located on a high plateau in Antarctica, between May 2012 and March 2016. The mean brightness temperature at DomeC for the 900 cm-1 atmospheric window channel is 218K, but it varies seasonally from 185K to 255K. Averaged over all simultaneous overpass data AIRS is 26±13 mK warmer than IASI-A, AIRS is 116±7 mK colder than CrIS. This is excellent agreement and consistent with SNO analysis in the literature. However, we find that differences for both AIRS/IASI-A and AIRS/CrIS are temperature dependent. AIRS is 120 mK colder at 200K, but 150 mK warmer at 230K than IASI-A. AIRS is 120 mK colder at 200K, 50mK colder at 230K than CrIS. Differences and scene temperature sensitivity of this magnitude have also been reported by other investigators. A scene temperature dependence bias can create a sampling bias which need to be taken into account when comparing data from current instruments, and even more so when analyzing data from vintage instruments with respect to climate change.
H. H. Aumann, Denis Elliott, and Evan Manning, "Comparison of the AIRS, IASI, and CrIS 900 cm-1 channel for Dome Concordia," Proc. SPIE 9972, Earth Observing Systems XXI, 997209 (Presented at SPIE Optical Engineering + Applications: August 30, 2016; Published: 19 September 2016); https://doi.org/10.1117/12.2235945.
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