Consistency between GSICS Products

Agenda

10min	Tim Hewison (Chair)	Agree Agenda Any other Business
40min	Dave Young (NASA) Kurt Thome (NASA)	An introduction to the CLARREO solar band spectrometer
20min	Ruediger Kessel (NIST)	General Methodology to Check Consistency
20min	Tim Hewison (EUMETSAT)	3-way Comparison of Meteosat-8, -9 and IASI
20min	Bob Iacovazzi (NOAA)	Consistency of AIRS and IASI as References
20min	All	Discussion - continued from previous web meeting

Attendees

EUMETSAT: Tim Hewison (Chair), Marianne König

NOAA: Fangfang Yu, Bob Iacovazzi

NASA: Dave Young, Constantine Lukashin

NIST: Rüdiger Kessel, Raju Datla

CMA: Li Yuan, Jingin Liu, Ling Sun, Lin Chen, Na Xu

CNES: Denis Blumstein, Patrice Henry

JMA: Hiromi Owada, Yuki Kosaka, Arata Okuyama, Kenji Date, Ryuichiro Nakayama

KMA: Dohyeong Kim

Key Points

Dave Young (NASA-Langley) gave us a very nice overview and update on CLARREO, highlighting some of the features of the calibration mechanism for the solar-band spectrometer. He described how it's pointing mechanism allows it to target collocations with specific instruments for use as an inter-calibration reference. The final scheduling of these observations can be done dynamically to meet requirements. However, a prioritised list of target instruments is needed to plan the observing strategy. GSICS developers were encouraged to provide input to define these priorities. Attendees agreed it was most likely that CLARREO would be best used to characterise the reference instruments used to inter-calibrate other instruments (e.g. MODIS/VIIRS in the solar band and IASI/CrIS in the infrared). This strategy should be discussed in more detail at next GRWG meeting in early 2011.

The CLARREO community were also interested in working together with GSICS to establish protocols for data availability. It was suggested that a dedicated meeting on this topic is set up with the GSICS Data Working Group.

Dave also mentioned the presentations from the recent CLARREO science team meeting are now available on the CLARREO website. GSICS developers are encouraged to review these presentations and feedback any questions to Dave.

Bob Iacovazzi (NOAA) described the comparisons of pseudo-channels derived from AIRS and IASI observations by the SNO method.

Rüdiger Kessel (NIST) gave a very useful theoretical overview of a method of quantifying the consistency between inter-calibration results from different pairs of instruments without a common reference. Tim Hewison (EUMETSAT) illustrated this concept with simple examples from the 3-way comparisons of Meteosat-8, Meteosat-9 and IASI. These results will be analysed quantitatively during September 2010.

The outstanding questions of how to resolve situations where the results are not consistent and how to migrate between different reference instruments will be addressed in future meetings.

-- TimHewison - 27 July 2010