München 2004 – scientific programme
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UP: Umweltphysik
UP 2: Atmosph
äre und Klima I
UP 2.4: Fachvortrag
Monday, March 22, 2004, 15:00–15:15, HS 118
Commissioning of the new Ground-Based Microwave Radiometer RAMAS at Summit, Greenland — •Sven Golchert1, Axel Kleindienst1, Nicole Buschmann1, Klaus Künzi1, Justus Notholt1, Jérôme de La Noë2, Nicola Schneider2, Helge Jønch-Sørensen3, Allan Gross3, Marianne Sloth3, Martyn Chipperfield4, and Steve Arnold4 — 1Institut für Umweltphysik, Universität Bremen, Germany — 2Observatoire de Bordeaux, Université Bordeaux 1, France — 3Danmarks Meteorologiske Institut, Københaven, Denmark — 4Institute for Atmospheric Science, University of Leeds, UK
The new microwave Radiometer for Atmospheric Measurements at Summit (RAMAS) has taken up preliminary operation at Summit, Greenland, and is now being prepared for continuous measurements. RAMAS covers the frequency band from 265 GHz to 280 GHz with an instantaneous bandwidth of currently 1 GHz. It utilises an SIS/HEMT mixer-preamplifier to minimise receiver noise. Tropospheric water vapour content, a major constraint on ground-based microwave radiometry, is exceptionally low at Summit station (72∘N, 38∘W, 3200 m). This for the first time in the Arctic will allow for year-round measurements and even the observation of short-term variations of less pronounced species. The principal objective of RAMAS is to measure O3, ClO, N2O and HNO3. This comprises a set of primary species involved in polar ozone chemistry, and an important dynamical tracer, which will allow for the separation of chemical and dynamical effects on O3. We present an overview of the instrument performance in its primary observation goals and first results about the feasibility of measurements of further species.