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GOME-2 on MetOp

Rosemary Munro(1), Craig Anderson(1), Jörg Callies(2), Enrico Corpaccioli(3), Michael Eisinger(3), Rüdiger Lang(1), Alain Lefebvre(3), Yakov Livschitz(1) and Abelardo Perez Albiñana(1)

(1) EUMETSAT, Am Kavalleriesand 31, 64295 Darmstadt, Germany
(2) ESA/ESTEC, Keplerlaan, 2200 AG , Noordwijk, Netherlands
(3) ESA/ESTEC, Keplerlaan, 2200 AG, Noordwijk, Netherlands

Abstract

The Second Global Ozone Monitoring Experiment (GOME-2) will perform operational global monitoring of ozone column densities and profiles, and column densities of other atmospheric trace gases such as NO2, BrO, OClO, HCHO, SO2 and H2O. GOME-2 is an improved version of the Global Ozone Monitoring Experiment (GOME-1) launched 1995 onboard the second European Remote Sensing Satellite (ERS-2) It will be embarked on the MetOp series of three polar-orbiting operational meteorological satellites, to be launched in 2006, 2010, and 2014. Although GOME-2 is considered a "recurrent" instrument - the basic design of GOME-2 being the same as that of GOME-1 - a number of technical improvements were made based on the experience with GOME-1 operations and data analysis and in response to more stringent user requirements. Particular improvements concern spatial resolution, polarisation measurements, and calibration. Level 0 to 1 processing will take place in the Core Ground Segment (CGS) at EUMETSAT while level 1 to 2 processing will be performed by the partner institutes of the Ozone Monitoring Satellite Application Facility (O3MSAF).

This paper presents the GOME-2 instrument characteristics and the main improvements as compared to GOME-1. Instrument calibration aspects will be discussed, covering on-ground calibration results, actual instrument performance, in-orbit verification during the first weeks after launch, and the scenario for routine in-orbit calibrations. We will present an overview of the on-ground processing of GOME-2 data from raw instrument packets (level 0) via calibrated (ir)radiances (level 1) to geophysical data (level 2). Additionally the post-launch GOME-2 calibration and validation activities, planned to be carried out centrally at EUMETSAT HQ will be discussed. This includes real-time verification and quality checking of the GOME-2 level 1 products, in addition to full validation activities taking into account feedback from the retrieval of geophysical parameters. As GOME-2 data will provide long time series of a number of trace gases, GOME-2 instrument and processing performance have to be monitored throughout its lifetime. The tools developed for this purpose will also be described.

 

Workshop presentation

Full paper

Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry