ISCCP and GSICS NOAA/NCEI Ken Knapp (& ISCCP Team)

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Presentation transcript:

ISCCP and GSICS NOAA/NCEI Ken Knapp (& ISCCP Team) Future collaborations between GSICS and the ISCCP project NOAA/NCEI Ken Knapp (& ISCCP Team) Meteorologist, NOAA National Centers for Environmental Information March 2017 National Oceanic and Atmospheric Administration | National Centers for Environmental Information

Overview ISCCP Reprocessing ISCCP Calibration ISCCP Future Discussion Plans, Status, ISCCP Calibration Visible, IR Window ISCCP Future Discussion

ISCCP History B1 data rescue began Data collection for 5-year project begins Release of first set of cloud products (C) Pinatubo causes a pause New cloud products developed (D) B1 data rescue began Last year processed for ISCCP

ISCCP Processing

History is repeating: 1982 and 2017 ISCCP designated SPCs to produce B1/B2 SPCs could develop products for B1/B2 Full resolution was too much for most users ISCCP GPC Merged B2 data globally Created merged global products Similar problems being discussed here... Provide adjustments or Level 1B What do Agencies provide vs. GSICS/IOGEO?

ISCCP Reprocessing: Improvements New satellite data inputs Using full resolution AVHRR GAC data (moved to 4 km data from 32 km) Using ISCCP B1 data (moved to 10 km data from 30 km). New resolution Higher resolution inputs allow 1 deg products (previously, 2½ degree) New products ISCCP HXG - 10 km global merged product (radiances, cloud flag, cloud parameters)

ISCCP Reprocessing: New Types DX HXS Hi-res, piXel, Single-sat HXG Hi-res, piXel, Global (new product) DS HGS Hi-res, Gridded, Single-sat D1 HGG Hi-res, Gridded, Global D2 HGH Hi-res, Gridded, Hourly-monthly mean D3 HGM Hi-res, Gridded, Monthly mean GridSat-like

ISCCP Reprocessing: New Types HXS HXG HGS HGG (240x monthly) HGH (8x monthly) HGM

ISCCP Reprocessing: Schedule Phase I Base Period [7/1983 - 12/2009] May 2017 Phase II Extended Period [1/1982-6/1983 and 1/2010-6/2015] Aug 2017 Phase III Routine Updates [ 6/2015 - ’present’] 2018?

ISCCP Calibration

ISCCP Calibration: Use the Earth ISCCP uses the Earth as its calibration reference.

ISCCP Calibration: Use the Earth

ISCCP Calibration: Current capability Replicate original ISCCP Use heritage process to calibrate

ISCCP Calibration Nominal (NOM) Normal (NORM) Absolute (ABS) Calibration from the satellite provider Pre-launch calibration Normal (NORM) Inter-satellite normalization Absolute (ABS) Temporally stable

What are we calibrating? POES AVHRR GAC GEO - B1U data All meteorological GEO satellites GOES 4-15 GMS 1-5, MTS 1R-2, HIM-8 MET 2-10 FY2 30 GEOs in all

ISCCP Calibration:Process AVHRR/GAC Monitor VIS Monitor IR Absolute calibration tied back to NOAA-9 IR - 10th and 90th percentiles VIS - 28 Earth targets (various surface types) LEO/GEO normalization Collocation comparisons - IR & VIS Comparison of retrieved properties: IR: Sfc. Temp & Cloud Temp. VIS: Sfc. Reflectance & Cloud Opt. Depth Adjust calibration if necessary

ISCCP Future

ISCCP Future GOES 16, Himawari-8, others? JPSS/VIIRS Indian Ocean GEO replacement? How and what to incorporate from GSICS

ISCCP Discussion ISCCP and GSICS Calibration(s)? ISCCP and the GEO Ring? Can calibration be divorced from algorithms? ISCCP’s final check is on retrieval Know your users/uses Start with the end in mind.