MTSAT-1R/-2 vs. IASI/AIRS IR GSICS Correction towards pre-operational phase Masaya Takahashi Meteorological Satellite Center, Japan Meteorological Agency

Overview and Purpose Overview Purpose of this presentation MTSAT-1R/-2 vs. IASI/AIRS IR GSICS Correction Demonstration phase since July 2010 Requirements for pre-operational phase Uncertainty evaluation incl. documentation: analysis is almost finished Product review by 1 more reviewer: not yet ATBD for pre-operational phase and User’s guide: not yet GSCIS Correction (netCDF) on the THREDDS server: has been done Purpose of this presentation To report the uncertainty evaluation To show the load map towards pre-operational phase To discuss some ambiguous requirements for pre-operational product

Uncertainty evaluation of the MTSAT-2 vs. IASI/AIRS GSICS Correction GWG_13.10: JMA to complete Uncertainty analysis for MTSAT-IASI products by analyzing random errors contribution from spatial and temporal variability at least and combine these with the currently analysed systematic uncertainty. That will be sufficient for promotion to pre-operational status.

Analysis method (Hewison 2013) Total uncertainty: Systematic uncertainty Random uncertainty (zi: random number) g(L): GSICS Correction, based on the regression of monitored/reference collocated radiances Monte-Carlo approach Temporal mismatch Longitudinal mismatch Latitudinal mismatch Geometric mismatch Spectral mismatch (*) Spectral Calibrations Temporal Variability Longitudinal Variability Latitudinal Variability Geometric Variability Spectral Variability Radiometric Noise (GEO) Radiometric Noise (LEO) * Great thanks to Dorothee for providing simulated IASI spectra up to 3030 cm-1 Hewison, T.J., 2013: An Evaluation of the Uncertainty of the GSICS SEVIRI-IASI Intercalibration Products, IEEE TGRS, 51(3), 1171-1181.

Systematic uncertainty of IASI-A GSICS correction Consistent results w/ SEVIRI Spectral mismatch is dominant for SWIR channel Temporal/Spatial mismatches are dominant for WV/window channels Total systematic uncertainty at standard scene (TB@dotted line) MTSAT-2/Imager 0.030K 0.0050K 0.0043K 0.0036K MSG-2/SEVIRI 0.008K 0.002K 0.003K 0.003K (Hewison 2013)

Random uncertainty of IASI-A GSICS correction Total random uncertainty at standard scene (TB@dotted line) Consistent trend w/ SEVIRI, but larger uncertainties Due to the instrument’s accuracy? Need to be investigated further… MTSAT-2/Imager 0.032K 0.013K 0.042K 0.040K MSG-2/SEVIRI 0.009K 0.009K 0.013K 0.011K (Hewison 2013)

Uncertainty comparison between IASI/AIRS GSICS Corrections IASI super channel for MTSAT-2/Imager IR4 (3.8um) Super channel for GEO imager Convolution of hyper-spectral sounder’s radiances using spectral gap-filling method (Tahara and Kato, 2009) Main difference: Spectral coverage Expected to be found on the systematic uncertainty (GEO spectral mismatch) AIRS super channels for MTSAT-2/Imager Missing IASI/AIRS channels IR4 (3.8um) IR3 (6.8um) IR1 (10.8um) IR2 (12.0um)

Systematic uncertainty of AIRS/IASI GSICS Correction Uncertainty of AIRS GSCIS Corrections Spectral mismatch is dominant for all the channels Total systematic uncertainty at standard scene (TB@dotted line) AIRS 0.13K 0.071K 0.0088K 0.0060K IASI 0.030K 0.0050K 0.0043K 0.0036K

Random uncertainty of AIRS/IASI GSICS Correction Total random uncertainty at standard scene (TB@dotted line) No significant difference between AIRS/IASI GSICS Correction AIRS 0.046K 0.010K 0.057K 0.062K IASI 0.032K 0.013K 0.042K 0.040K

Promotion of MTSAT GSCIS Correction to pre-operational phase Uncertainty evaluation LEO spectral calibration (IASI/AIRS accuracy): not validated yet Documentation: not yet Will be finished by the end of summer 2015 S-NPP/CrIS wouldl also be considered (Dr. Yoshino is working on the implementation) ATBD and User’s guide Will be prepared by the end of summer 2015 Product review Difficult to find an internal reviewer now due to the preparation for Himawari-8/AHI products Would be great if the GCC introduce a reviewer

Discussion Responsibility for promoting non-operational instruments’ GSCIS Correction to operational phase Himawari-8 will take over MTSAT-2 in mid-2015 MTSAT-2 will be in the “back-up” operation mode of Himawari-8 MTSAT-1R re-orbit: planned at the end of 2015 Should we promote these products to operational phase even after they will stop the operation? (This could be related to “re-processing” of the GSICS Correction) Configuration of GEO-LEO-IR Window period: Should we use the common one? EUMETSAT/NOAA: 29-day window for RAC, JMA: 30-day Hour range for the products EUMETSAT and NOAA: night-time observation for all the channels JMA: night-time for SWIR (3.8um), day/night time for other channels Are GEO-LEO-IR GSCIS Correction derived from night-time observation only recognized as the GSICS products?

Thanks for your attention