Günter Rohen
IUP
10.06.2005, 13.00 c.t.
Room S3120
Ozone density profiles between 35 and 65 km
altitude are derived from scattered sunlight limb radiance spectra measured by
the SCIAMACHY instrument on the Envisat satellite. The method is based on the
inversion of normalized limb radiance profiles in the Hartley absorption bands
of ozone at selected wavelengths in the ultraviolet (UV) between 250 and 310 nm.
It employs a non-linear Newtonian iteration version of Optimal Estimation (OE)
coupled with the raditive transfer model SCIARAYS. The limb scatter technique
combined with a classical OE retrieval in the short-wave UV-B and long-wave UV-C
delivers reliable results as shown by a first comparison with MIPAS V4.61
profiles yielding agreement within 10% between 38 and 55 km. An overview of the
methodology and an initial error analysis is presented. Furthermore the effect
of the solar proton storm between 28 October and 6 November 2003 on the ozone
profiles retrieved from SCIAMACHY limb radiance measurements is shown. They
indicate large depletion of ozone of about 60% at 50 km in the northern
hemisphere, a weaker depletion in the southern hemisphere and a dependency of
the depletion on the Earth magnetic field.