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PROJECT 1 Cal/Val MODIS with S-HIS (AIRS) radiances. CAL-VAR-IO. Authors: Annamaria, Tiziana, Tiziano, Teo. MODIS / SHIS Comparisons A detailed comparison should account for: instrumental noise and scene variations Different spatial footprints

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slide1

PROJECT 1

Cal/Val MODIS with S-HIS (AIRS) radiances

CAL-VAR-IO

Authors: Annamaria, Tiziana, Tiziano, Teo

slide2

MODIS / SHIS Comparisons

  • A detailed comparison should account for:
    • instrumental noise and scene variations
    • Different spatial footprints
    • Different view angles (MODIS is near nadir, SHIS is ~±35deg from nadir)
    • Different observation altitudes (MODIS is 705km, SHIS is ~20km on ER2, ~14km on Proteus)
    • Different spectral response (MODIS has different channels with different bandwidth, SHIS Dn=~0.5 cm-1) and sampling
slide3

X

TORPEX 2003

slide4

FOV MODIS

FOV S-HIS

  • Average SHIS data within MODIS FOV(s) and compare
slide5

Average SHIS data within MODIS FOV(s) & compare

  • We convolve high resolution data with the response functions of the selected MODIS bands
  • Ex. of response functions of MODIS CO2 bands
slide8

MODISsim

MODISobs

S-HISsim

S-HISobs

  • Compare Residuals from calculations: (obs-calc)SHIS to (obs-calc)MODIS
    • SHIS and MODIS calcs each done at correct altitudes, view angles, spectral resolution and sampling.
    • Monochromatic calcs done using same forward model,atmospheric state, and surface property inputs.
slide11

MODISsim

MODISobs

S-HISsim

S-HISobs

  • Difference Residuals: Spectral Resolutions made similar
slide14

CONCLUSIONS:

  • MODIS-(S-HIS):
  • GOOD RESULTS IN THE WINDOW AND H2OVAP
  • EXPECTED DISAGREEMENTS IN THE CO2 AND O3
  • MODIS-(S-HIS) RESIDUALS:
  • GOOD CORRECTION IN THE O3 BAND
  • SIMULATIONS WITH TOO MUCH WV AT HIGH LEVELS