The new CAMS global reanalysis of atmospheric composition
Inness, Antje ; Engelen, Richard ; Flemming, Johannes
ECMWF has a long history of providing global meteorological reanalyses, the latest of which is ERA5. Meteorological reanalyses are datasets providing a complete and consistent record of meteorological conditions for recent decades. They are produced by combining model information with observations through data assimilation. This ensures that the resulting gridded datasets are comprehensive and consistent over time. Over the last decade, reanalysis activities have been extended to include other components of the Earth system, such as the land surface, the ocean and the chemical composition of the atmosphere. This is in line with the emphasis in ECMWF's current ten-year Strategy on the need to account for all relevant interactions between different components of the Earth system in ECMWF's Integrated Forecasting System (IFS). In the framework of the Copernicus Atmosphere Monitoring Service (CAMS), implemented by ECMWF on behalf of the EU, ECMWF released a new reanalysis of atmospheric composition in September 2018. This 'CAMS reanalysis' (CAMSRA) covers the period from 2003 to 2016 and will be extended to subsequent years by adding one year each year. It provides consistent information on aerosols and reactive gases, such as ozone (O3), carbon monoxide (CO), nitrogen dioxide (NO2) and many more chemical species, using a fully integrated atmospheric composition modelling and data assimilation system based on the IFS.
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