Technological Needs for European Space Agency's Microwave Limb Sounders
EUROPEAN SPACE RESEARCH AND TECHNOLOGY CENTRE NOORDWIJK (NETHERLANDS)
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Since they present good capabilities for the detection of important trace species for atmospheric chemistry, the European Space Agency ESA has, in recent years, investigated a number of limb sounding instrument principles. These feasibility studies have provided baseline concepts which have helped to grasp the main features of these instruments and to identify their critical aspects. A number of scientific and technical activities have then followed, dedicated to specific topics, from retrieval simulations to developments of antennas, calibration loads, mixers, support to campaigns, etc. To make observations in the upper troposphere and lower stratosphere UTLS, where they are the most urgently needed, the ESA limb sounder concept is called MASTER Millimetre-wave Acquisitions for StratosphereTroposphere Exchange Research, which counts five broad detection bands, hence five receivers, from 200 to 500 GHz. The main channels of MASTER for UTLS sounding, which detect in priority ozone, water vapour and carbon monoxide, are centered near 300, 325 and 345 GHz.
- Atmospheric Physics
- Radiofrequency Wave Propagation