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Between 1970 and 1990 the major advances in atmospheric chemistry were made in gas-phase photochem-istry, except perhaps for a brief intermezzo of " nuclear winter " studies. This focus is now shifting, as it is rec-ognised that natural and anthropogenic aerosols play a substantial role in the radiative properties of the atmosphere and Earth's climate. In(More)
During the development programme, it was determined that the Advanced Scatterometer Radar, now embarked on METOP-A could not meet its stringent radiometric requirements without regular, accurate, calibration. It was not believed that the stability requirements of 0.2dB or better could be met by natural sources such as rain forest or simple corner(More)
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