project 1 cal/val modis with s-his (airs) radiances
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
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
• 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 =~0.5 cm-1) and sampling
X
TORPEX 2003
FOV MODIS
FOV S-HIS
Average SHIS data within MODIS FOV(s) and compare
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
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.
MODISobs
S-HISobs S-HISsim
MODISsim
Difference Residuals: Spectral Resolutions made similar
MODISobs
S-HISobs S-HISsim
MODISsim
CONCLUSIONS:
• MODIS-(S-HIS):
1. GOOD RESULTS IN THE WINDOW AND H2OVAP
2. EXPECTED DISAGREEMENTS IN THE CO2 AND O3
• MODIS-(S-HIS) RESIDUALS:
1. GOOD CORRECTION IN THE O3 BAND
2. SIMULATIONS WITH TOO MUCH WV AT HIGH LEVELS