GRWG IR Sub-Group Web Meeting 2016-09-08

GSICS Web Meeting on Reference Instrument Traceability Report

Template for Report on Traceability and Uncertainty of GSICS Infrared Reference Sensors


  1. Tim Hewison (EUMETSAT) - Introduction and recommended coverage factor, summary of previous meeting
  2. Denis Jouglet (CNES) – Review of spectral averaging methods
  3. Tim Hewison (EUMETSAT) – Inter-comparison database
  4. Dave Tobin (SSEC) – Populating database with IASI-CrIS comparison results
  5. Manik Bali (NOAA) - Comparisons of IASI-A and AATSR
  6. All - Agree contributions, timeline and next steps


CNES: Denis Jouglet

EUMETSAT: Tim Hewison (Chair), Dorothee Coppens

NASA/JPL: Steve Broberg

NOAA: Fangfang Yu, Fred Wu, Manik Bali

SSEC: Dave Tobin


Action GIR.20160908.1: Denis Jouglet (CNES) to apply spectral averaging method to calculate static weightings for generating 10cm-1 pseudo channels for AIRS-IASI comparison over 3 year period (2013-03-01/2016-03-01) - and consider application for CrIS -IASI comparisons.

Action GIR.20160908.2: Dorothée Coppens (EUMETSAT) to look at impact of CrIS responsivity changes related to apodisation.

Action GIR.20160908.3: Dave Tobin (SSEC) to regenerate comparison results in 10K bins over 3 year period (2013-03-01/2016-03-01), describe method and share raw SNO results.

Action GIR.20160908.4: Tim Hewison (EUMETSAT) to regenerate comparison results in 10K bins and redo double-difference analysis, expressing results in BT, radiance and % radiance.

Recommendation: Manik Bali (NOAA) to investigate adding incidence angle matching to AATSR-IASI comparison, with weighting according to the variance of the SNO radiances.

Recommendation: Manik Bali (NOAA) to review outline for report on Traceability and Uncertainty of GSICS Infrared Reference Sensors and propose how his AATSR-IASI analysis could be included/referenced.
Topic revision: r8 - 15 Mar 2017, TimHewison
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