Seminar Ozean, Eis, Atmosphäre
Seminar Ozean, Eis, Atmosphäre |
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Termin: 27.11.2001
Referent/in:
Stefan Voss, iup-Bremen
Titel: Remote sensing of sea ice
Three satellite sensors are used remote
sensing of sea-ice properties.
The ERS-scatterometer supplies backscatter
koefficients (sigma-0)
on a weekly base. A time series of sigma-0
over several years in the
polar regions is used to discribe the change
of sea-ice properties
in the course of a year.
QSCAT-scatterometer data with a daily
coverage of the polar regions
show regions of rapide increasing sigma-0
simultaneously to
decreasing brighness temperatures measured
with the SSM/I radiometer. With the help of both wind, temperature and
precipitation data
of the Antarctic where no weather maps exist
and land, ship (e.g.
RV Polarstern) and aircraft observations in
the Arctic, it is possible
to originate the changes to melt and
refreezing events at the sea-ice
surface connected with snow metamorphism.
Aside from this, a technique is introduced to
detect this areas of
changed surface properties and improve the
customary ice-type
classification to get better input data for
climate modeling.