Seminar Ozean, Eis, Atmosphäre

Date: 28.10.2003

Speaker: G. Spreen (IUP)

Two new microwave scanning radiometers, AMSR and AMSR-E, were launched in 2002 (Satellites: Midori-2, Aqua). They operate at six frequency bands (6.9 GHz, 10.7 GHz, 18.7 GHz, 23.8 GHz, 36.5 GHz and 89 GHz), each at both vertical and horizontal polarization. These frequencies cover the same range as the SSM/I (19.4 GHz, 22.2 GHz, 37 GHz and 85.5 GHz). Therefore the same retrieval methods should by applicable to AMSR data.

The ARTIST Sea Ice algorithm (ASI) which was developed in our institute for SSM/I was adapted to AMSR data. The ASI algorithm uses the 89 GHz channels and therefore provides sea ice concentrations of about 5 km resolution. This is an improvement in resolution of two to three times compared to the ASI SSM/I data and also to the standard AMSR sea ice algorithm (Bootstrap).

This talk gives an outline of the ASI algorithm including the used weather filters. First results are shown and compared to (1) ice concentrations derived from SSM/I data by the ASI algorithm and to (2) ice concentrations derived from AMSR data by the Bootstrap algorithm. Finally some applications are presented.