Atmospheric Chemistry and Physics
www.atmos-chem-phys.net
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7
1
2007
10.5194/acp-7-97-2007
http://www.atmos-chem-phys.net/7/97/2007/
http://www.atmos-chem-phys.net/7/97/2007/acp-7-97-2007.html
http://www.atmos-chem-phys.net/7/97/2007/acp-7-97-2007.pdf
97
106
2007-01-10
Validation of SCIAMACHY top-of-atmosphere reflectance for aerosol remote sensing using MERIS L1 data
W. von Hoyningen-Huene
A. A. Kokhanovsky
M. W. Wuttke
M. Buchwitz
S. Noël
K. Gerilowski
J. P. Burrows
B. Latter
R. Siddans
B. J. Kerridge
Institute of Environmental Physics/Remote Sensing, University of Bremen, Germany
Space Science and Technology Department, Rutherford Appleton Laboratory, Chilton, UK
Aerosol remote sensing is very much dependent on the accurate
knowledge of the top-of-atmosphere (TOA) reflectance measured by
a particular instrument. The status of the calibration of such an
instrument is reflected in the quality of the aerosol retrieval.
Current data of the SCIAMACHY (SCanning Imaging Absorption
spectroMeter for Atmospheric CHartographY) instrument (operated
with the data processor version 5 and earlier) give too small
values of the TOA reflectance, compared e.g. to data from MERIS
(Medium Resolution Imaging Spectrometer), both operating on
ENVISAT (ENVIronmental SATellite). This effect causes retrievals
of wrong aerosol optical thickness and disables the processing of
aerosol parameters.
<br><br>
From an inter-comparison of MERIS and SCIAMACHY TOA reflectance,
for collocated scenes correction factors are derived to improve
the insufficient SCIAMACHY L1 data calibration for data obtained
with the processor 5 for the purpose of aerosol remote sensing.
The corrected reflectance has been used for tests of remote
sensing of the aerosol optical thickness by the BAER (Bremen
AErosol Retrieval) approach using SCIAMACHY data.
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Lichtenberg, G., Kleipool, Q., Krijger, J. M., van Soest, G., van Hees, R., Tilstra, L. G., Acarreta, J. R., Abel, I., Ahlers, B., Bovensmann, H., Chance, K., Gloudemans, A. M. S., Hoogeveen, R. W. M., Jongma, R., No\"el, S., Pieters, A., Schrijver, H., Schrijvers, C., Sioris, C.E., Skupin, J., Slijkhuis, S., Stammes, P., and Wuttke, M.: SCIAMACHY Level 1 data: Calibration concept and in-flight calibration, Atmos. Chem. Phys., 6, 5347–5367, 2006.
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Noel, S.: Determination of correction factors for SCIAMACHY radiances and irrandiance, Technical Report IFE-SCIA-SN-2004040514, University of Bremen, 2004.
Rozanov, V. V., Buchwitz, M., and Burrows, J. P.: SCIATRAN – A new radiative transfer model for geophysical applications in the 240–2400 nm spectral region: The pseudo-spherical version, Adv. Space Res., 29, 1831–1835, 2001.
Skupin, J., Gerilowski, K., No\"el, S., Wuttke, M., Bovensmann, H., and Burrows, J. P.: Improvement of the SCIAMACHY radiometric calibration and its validation on solar irradiancees in the spectral range from 240 to 2380 nm, Proc. of ESA ENVISAT and ERS Sympos. 6–10 September 2004, Salzburg, ESA Special Publication SP-572, April 2004.
von Hoyningen-Huene, W., Freitag, M., and Burrows, J. P.: Retrieval of aerosol optical thickness over land surfaces from top-of-atmospher radiance, J. Geophys. Res., 108, 4260, doi:10.1029/2001JD002018, 2003.
von Hoyningen-Huene, W., Kokhanovsky, A. A., Freitag, M., and Burrows, J. P.: Aerosol retrieval over land surfaces from multispectral nadir looking satellite measurements, in: Remote Sensing of Clouds and the Atmosphere VIII, edited by: Schäfer, K. P., Cameron, A., Carleer, M. R., and Picard, R. H., Proc. of SPIE (SPIE, Bellingham, WA 2004), vol. 5235, 366–374, 2004.