Abstract
Abstract. The Global Ozone Monitoring Experiment-2 (GOME-2) flies on the Metop series of satellites, the space component of the EUMETSAT Polar System. In this paper we will provide an overview of the instrument design, the on-ground calibration and characterization activities, in-flight calibration, and level 0 to 1 data processing. The current status of the level 1 data is presented and points of specific relevance to users are highlighted. Long-term level 1 data consistency is also discussed and plans for future work are outlined. The information contained in this paper summarizes a large number of technical reports and related documents containing information that is not currently available in the published literature. These reports and documents are however made available on the EUMETSAT web pages and readers requiring more details than can be provided in this overview paper will find appropriate references at relevant points in the text.
Highlights
The Global Ozone Monitoring Experiment–2 (GOME-2) (Fig. 1) is an improved version of the Global Ozone Monitoring Experiment on the second European Remote Sensing Satellite (GOME-1/ERS-2) (Munro, 2006)
Light scattered from this plate, or in general, light from other calibration sources such as the PtCrNeAr spectral light source (SLS) for wavelength calibration, and the Quartz Tungsten Halogen white light source (WLS) for etalon calibration are directed to the scan mirror using auxiliary optics
The GOME-2 instrument was built by an industrial team led by Selex Galileo (Italy) with support from Laben (Italy), TNO-TPD (Netherlands), Arcom Space (Denmark), Innoware (Denmark), and Finavitec (Finland) where TNOTPD is responsible for the calibration and characterization of the instrument
Summary
The four main channels (detectors) of the GOME-2 instrument provide continuous spectral coverage of the wavelengths between 240 and 790 nm with a spectral resolution full width at half maximum (FWHM) between 0.26 and 0.51 nm. The PMDs are cooled by Peltier elements in an open-loop configuration which reject heat to the main optical bench through the polarization monitoring unit mechanical elements (Callies et al, 2000). In order to calculate the transmission of the atmosphere, which contains the relevant information on trace gas concentrations, the solar radiation incident on the atmosphere must be known For this measurement a solar viewing port is located on the flight-direction side of the instrument. When this port is opened, sunlight is directed via a ∼ 40◦ incidence mirror to a diffuser plate Light scattered from this plate, or in general, light from other calibration sources such as the PtCrNeAr spectral light source (SLS) for wavelength calibration, and the Quartz Tungsten Halogen white light source (WLS) for etalon (and, optionally, pixel-to-pixel gain) calibration are directed to the scan mirror using auxiliary optics. The only exceptions are light-emitting diodes (LEDs) which are located in front of the detectors to monitor the pixel-to-pixel gain
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