workshops 24-May-2012     
Munro, Rosemary

 

GOME-2 on MetOp

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

(1) EUMETSAT, Am Kavalleriesand 31, 64295 Darmstadt, Germany
(2) 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.

 

 

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