Bremen 2000 – scientific programme

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UP: Umweltphysik

UP 10: Poster: Datenauswertung (Atmosph
äre) II

UP 10.4: Poster

Wednesday, March 22, 2000, 15:30–16:30, Foyer

Pointing and Temperature Retrieval from the Superconducting Submillimeter Wave Limb Emission Sounder — •Carmen Verdes, Stefan Bühler, and Klaus Künzi — University of Bremen, Institute of Environmental Physics, Kufsteiner Strasse, D-28359 Bremen, Germany.

The Superconducting Submillimeter Wave Limb Emission Sounder (SMILES) is approved to be boarded on the Japanese Experimental Module (JEM) of the International Space Station (ISS) in 2003. The JEM/SMILES is also a pre-phase of SMILES on the ATMOS-C1 atmospheric environment satellite, which is planned to be launched around 2006. JEM/SMILES will measure atmospheric limb radiances at 640 GHz. In this experiment, it is proposed to use superconductor-insulator-superconductor (SIS) mixers to achieve an ultra-high sensitive receiver. A system noise temperature of less than 500 K, compared to 5000 K of a usual receiver, is possible with this technology.

The target species of JEM/SMILES are O₃, ClO, HCl, HOCl, BrO and HO₂. It is expected that the instrument will deliver for example O₃ profiles with a precision on the few percent level and an altitude resolution better than 2 km.

The data interpretation requires a good knowledge of the atmospheric temperature profile and of the instrument pointing. However, these quantities can also be derived from the limb spectra, as is demonstrated here. We use simulations to develop a suitable algorithm and assess its accuracy.