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Intercomparisons of OMI and MODIS Deep Blue Aerosol Products

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Title: Intercomparisons of OMI and MODIS Deep Blue Aerosol Products


1
Intercomparisons of OMI and MODIS Deep Blue
Aerosol Products
N. Christina Hsu, M.-J. Jeong, Omar Torres, and
Jay Herman NASA Goddard Space Flight Center
University of Maryland Greenbelt, Maryland USA
2
Aerosol Remote Sensing Retrievals
3
MODIS Visible NIR Bands superimposed on the
GOME spectral reflectance taken over the Sahara
OMI
4
(No Transcript)
5
Surface Reflectivity Data Base
6
  • Asian Dust Outbreak
  • 6 April 2001
  • Deep Blue Algorithm

0.85
1.0
0.90
0.95
  • Cloud mask works very well
  • Aerosol retrievals indicate dust
  • storms originated from Gobi
  • and Inner Mongolia regions
  • Single scattering albedos are
  • quite different between these
  • two regions

SSA (412nm)
7
Perfect Dust Storm 7 April 2001
?a
?
8
(No Transcript)
9
Characteristics of OMI and MODIS measurements
  • Temporal Sampling
  • Both OMI and MODIS provide global coverage
  • once a day
  • part of A-Train constellation
  • 2. Spatial sampling
  • OMI 13 x 24 km, MODIS 1 x 1 km

Implications on 1. Sub-pixel cloud
contamination 2. Spatial resolution of aerosol
plumes
10
(No Transcript)
11
(No Transcript)
12
(No Transcript)
13
Intercomparisons of Aerosol Products From MODIS,
SeaWiFS, and MISR
14
Summary
  • Preliminary results show
  • Qualitative pattern of aerosol distributions are
    similar between OMI and MODIS Deep Blue products
  • The aerosol optical thickness values are
    comparable between OMI and MODIS for moderate
    AOT, while MODIS AOT are significantly lower than
    OMI for low AOT
  • Cloud contamination in thick smoke clouds could
    still be improved.
  • We plan to
  • Continue to intercompare OMI and MODIS Deep
    Blue AOT on the global basis
  • Extend the intercomparisons into single
    scattering albedo values.

15
Comparisons with AOT from Sun Photometers in
China during ACE-Asia
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