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NPP CrIS Sensor: Calibration and Radiative Transfer for the Climate Record

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Title: NPP CrIS Sensor: Calibration and Radiative Transfer for the Climate Record


1
NPP CrIS Sensor Calibration and Radiative
Transfer for the Climate Record
  • L. Larrabee Strow, UMBC, P.I.
  • Chris Barnet, NOAA-NESDIS, Co.I.
  • Nov 4-6, 2003 

2
SDR/EDR/CDR List
  • CrIS SDRs
  • Pre- and Post-launch calibration/validation
  • Concentrate on
  • ILS accuracy (high risk issues)
  • In-homogenous field-of-view effects on SDRs (with
    J. Susskind and E. Fishbein)
  • CrIS EDRs Radiative Transfer Issues (RTA)
  • RTA key to accuracy of most EDRs Temperature,
    Water vapor, Ozone, Skin Temperature, IR surface
    emissivity
  • RTA spectroscopy and parameterization accuracies
  • Minor gases in RTA CO2, N2O, CH4, CO
  • Impact of aerosols on EDR production (scattering
    RTA)
  • CrIS Cal/Val Preparation
  • In-orbit ILS characterization (repeat from above)
  • SDR RTA validation approaches

3
Roles of P.I., Co.-I., with NPP Team
  • P.I. (AIRS ILS calibration, RTA, L1b validation,
    aerosols)
  • CrIS ILS test and calibration, pre- and
    post-launch
  • Evaluation of NGST CrIS RTA
  • Production of AIRS S/W compatible CrIS RTAs
    (early version already being used by NGST)
  • Produce CrIS RTAs for in-homogenous FOVs,
    scattering
  • Co.I. (AIRS L2 retrievals, CO2 issues, CrIS EDR
    simulations)
  • Integrate P.I. produced CrIS RTAs into CrIS
    science retrieval code used for AIRS and SOAT
    evaluation activities (J. Susskind, GSFC)
  • E. Fishbein (NASA/JPL NPP Science Team Member)
  • Use CrIS RTA for scene generation and retrieval
    simulations

4
Approach
  • Pre-flight test and calibration of CrIS
  • Participate in analysis of CrIS ILS data from
    EDU2/3 and flight models (hopefully in near
    real-time)
  • Contribute to CrIS test procedure planning
  • Review impact of CrIS test and calibration
    strategies on (1) post-launch cal/val, (2)
    EDR/CDR accuracies
  • Post-launch cal/val
  • Participate in post-launch cal/val planning for
    CrIS ILS, SDRs, RTA
  • Study utility of various cal/val approaches for
    CrIS
  • SDR algorithm evaluation, mostly with regard to
    risk reduction
  • Produce various CrIS forward models
  • 100 physics compatible with AIRS RTA to allow
    realistic understanding of CrIS performance on
    proxy data 1 update/year
  • CrIS forward model with inhomogenous scenes
    (limited functionality)
  • CrIS scattering forward model if needed to
    understand aerosol contamination
  • RTA includes spectroscopy, parameterization,
    minor gas concentrations
  • Evaluate NGST CrIS RTA and suggest changes from
    lessons-learned from AIRS

5
MODIS vs AIRS Observation of Eastern
Mediterranean Dust Storm
DK
6
Fit to West African Dust Spectrum for Particle
Size and Optical Depth
  • Cyprus 3.7 micron dia
  • Gobi 3.9 micron dia
  • Carribean 3.1 micron dia
  • West Africa 4.5 micron dia

Blue Fitted O-C Red Clear sky O-C
7
AIRS Detection of Dust in Cloud-Cleared Radiances
8
AIRS Detection of Dust in Cloud-Cleared Radiances
9
Resources Offered/Requested
  • Offered
  • Various CrIS RTAs (clear air, scattering,
    in-homogenous scene)
  • Very distilled AIRS validation data sets,
    possibly converted to CrIS form (J. Susskind?)
  • Requested
  • CrIS Test Data
  • Need EDU2 data ASAP so we are prepared to produce
    a timely analysis of EDU3 data that could impact
    flight model preparations
  • We would like to receive limited flight-model
    test data in near real-time in order to assist in
    doing the best possible pre-launch calibration

10
Contribution to Deliverables
  • Cal/Val Report
  • CrIS RTA (algorithm assessment)
  • Operations concept, especially in terms of
    instrument turn-on and early checkout
  • How involved will NPP team be in early instrument
    checkout?
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