Operational trace gas column observations from GOME-2 on MetOp

Kurzfassung

This contribution focuses on the operational GOME-2 trace gas column products developed in the framework of EUMETSAT's Satellite Application Facility on Atmospheric Composition Monitoring (AC-SAF). We present an overview of the retrieval algorithms for ozone, the minor trace gases NO2, SO2 and formaldehyde, as well as water vapour. We show examples of various applications such as ozone, air quality and climate monitoring using observations from the three GOME-2 instruments. Special attention will be given to the latest GOME-2 instrument on MetOp-C, as launched on 7 Nov. 2018. Total ozone and the minor trace gas columns from GOME-2 are retrieved with the latest version 4.9 of the GOME Data Processor (GDP), which uses an optimized Differential Optical Absorption Spectroscopy (DOAS) algorithm, with air mass factor conversions based on the LIDORT model. Improved total and tropospheric NO2 columns are retrieved in the visible wavelength region between 425 and 497 nm. SO2 emissions from volcanic and anthropogenic sources can be measured by GOME-2 using the UV wavelength region around 320 nm. The GOME-2 trace gas columns have reached the operational EUMETSAT product status, and are available to the users in near real time (within two hours after sensing by GOME-2). The use of trace gas observations from the GOME-2 instruments for air quality purposes will be illustrated for Europe, North America and South-East Asia. Furthermore, comparisons of the GOME-2 observations with Sentinel-5P data and ground-based measurements will be shown. Finally, the use of GOME-2 trace-gas column data in the Copernicus Atmosphere Monitoring Service (CAMS) will be presented.