Performance degradation of GOME polarization monitoring

Details Performance degradation of GOME polarization monitoring Performance degradation of GOME polarization monitoring

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999adspr..23.1393t&link_type=abstract

Advances in Space Research, Volume 23, Issue 8, p. 1393-1396.

Computer Science

Performance

2

Scientific paper

The Global Ozone Monitoring Experiment (GOME) is a nadir-viewing double spectrometer which measures solar radiation backscattered from the Earth's atmosphere over a broad wavelength range, from the ultraviolet (UV) to the near infrared (Burrows, 1998). It has been operating since 1995 on board the ESA ERS-2 satellite, monitoring a large range of atmospheric trace constituents, with particular emphasis on ozone. The performance of the instrument is monitored in-flight by means of routine on-board calibration measurements, observing the sun and, occasionally, the moon. In this way, degradation of optical components in space can be monitored. The performance of the broad-band detectors which monitor the polarization state of the incoming light is analyzed by means of solar measurements. The measurements of the polarization detector which samples UV light show a degradation of 6% per year. The optical components affected can be (partially) identified by monitoring the fractional polarization, which is a characteristic of the light back-scattered by the Earth's atmosphere. The influence of the observed degradation on Earth radiation measurements is estimated to be in the order of 1.5% per year in the UV wavelength range.

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