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GOMOS

Introduction

The Global Ozone Monitoring by Occultation of Stars (GOMOS) instrument is one of the ten instruments onboard the Envisat satellite launched from Kourou (French Guyana) on the 28th of February 2002 and operated by the European Space Agency (ESA). Its main objective is to provide highly accurate profiles of stratospheric ozone, but it also supplies profiles of NO₂, NO₃, H₂O and temperature.

The data issued by ESA include both Level 1B and Level 2 products. The L1b data are the geolocated calibrated background and transmission spectra. The L2 data include profiles of temperature and atmospheric constituents. They come in a number of versions: a near real time (nrt) version, a consolidated version, result of a first processing by ESA to eliminate bad data and perform a few basic checkings, and fully reprocessed versions.

Availability of data

Reprocessed L2 data from 2003 and 2004 are currently available from the BADC.

In accordance with an agreement between the European Space Agency and NERC, the BADC is allowed to distribute data from the GOMOS instrument to

• holders of an ESA Category-1 (*) grant (**) entitling them to use the GOMOS data;
• investigators of current or past UTLS Ozone projects, for the purpose of their research in the context of their UTLS Ozone project or as a natural continuation of it, under Category-1 (*) project conditions (the BADC being the Cat-1 Project Leader, and UTLS Ozone participants its co-investigators). For information, the ESA Terms and Conditions of this contract (PDF document) are available from the ESA Earth Observation Principal Investigator Portal.

(*) The European Space Agency (ESA) supports research and applications based on ESA data through a funding scheme involving reports to ESA. "Category 1" (in short Cat-1) grants support scientific research (opposed to "Category 2" projects, which deal with operational use of the data).

(**) To submit a Cat-1 project proposal to ESA, please see the Earth Observation Principal Investigator Portal.

Access to data

If you belong to one of the above two categories of users and would like to access the GOMOS data held at BADC, please

1. Register as a BADC user. If you already are a BADC registered user, skip this step. If you have forgotten your BADC user ID and/or password, please contact the BADC helpdesk at badc@rl.ac.uk.
2. Apply for access to the GOMOS data. Application involves the agreement with the GOMOS Conditions of Use, which refer to the ESA Data Policy.

Data can be viewed and downloaded from the GOMOS archive. The ESA website provides tools (EOLI online and off-line catalogues) to help you select the data files you need as a function of the desired time and geographical spans (please see Links below).

Documentation

• GOMOS Product Handbook published by ESA.
• BADC Conditions of Use of GOMOS data.
• The Terms and Conditions applying to Category-1 data use can be found on the website of the ESA Earth Observation Principal Investigator (EOPI) Portal.
• ESA Data Policy.

Links

• The European Space Agency (ESA) website.
• The Envisat satellite website at ESA.
• The GOMOS instrument website at ESA.
• The ESA Earth Observation Principal Investigator (EOPI) Portal.
• The ESA Envisat data catalogues allow users to search the datasets.

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