Seminar Ozean, Eis, Atmosphäre
Universität Bremen, Gebäude NW1, Raum N3380
Termin: 04.06.2002
Referent/in: Martin Freitag,
Institut für Umweltphysik
Universität Bremen, Bremen
Title: Implementation of the TOMS AOT-Algorithm for GOME Data
Since years the Absorbing Aerosol Index AAI of the Total Ozone
Mapping Spectrometer TOMS is used to determine, where absorbing Aerosol
is. Omar Torres published in 1998 the theoretical
basis for
an Aerosol Optical Thickness algorithm, to determine a physical
quantity, and
not only an index. Cause the algorithm based on two waelength (331 nm and 360 nm or 340
nm and 380 nm - depending on the TOMS-Sensor) which are also in the
spectral range of GOME, it should be possible to determine the AOT also
from GOME. But there
are still some problems... The talk will include an explanation of the algorithm, some
'preprocessing'
of the GOME data and results from the GOME Narrow Swath Timeline GMNNOT41
(i.E.: GOME small swath 80 km x 40 km Pixel) from 1998. Results from TOMS can be found at
TOMS AOT-Page and in J. Atm. Sci.
59,2002 O. Torres, J.R. Herman, Z. Ahmad, J.
Gleason, 1998:
Derivation of aerosol properites from satellite measurements of
backscattered ultravilet radiation: Theoretical basis. J. Geophys. Res.,
103, 17099-17110
O. Torres, P.K. Bhartia, J.R. Herman, A.
Sinyuk, P. Ginoux, B. Holben, 2002:
A Long-Term Record of Aerosol Optical Depth from TOMS Observations and
Comparision To AERONET Measurements, J. Atm. Sci.,59,398-413