The CAMS reanalysis of atmospheric composition

Abstract

Abstract. The Copernicus Atmosphere Monitoring Service (CAMS) reanalysis is the latest global reanalysis dataset of atmospheric composition produced by the European Centre for Medium-Range Weather Forecasts (ECMWF), consisting of three-dimensional time-consistent atmospheric composition fields, including aerosols and chemical species. The dataset currently covers the period 2003–2016 and will be extended in the future by adding 1 year each year. A reanalysis for greenhouse gases is being produced separately. The CAMS reanalysis builds on the experience gained during the production of the earlier Monitoring Atmospheric Composition and Climate (MACC) reanalysis and CAMS interim reanalysis. Satellite retrievals of total column CO; tropospheric column NO2; aerosol optical depth (AOD); and total column, partial column and profile ozone retrievals were assimilated for the CAMS reanalysis with ECMWF's Integrated Forecasting System. The new reanalysis has an increased horizontal resolution of about 80 km and provides more chemical species at a better temporal resolution (3-hourly analysis fields, 3-hourly forecast fields and hourly surface forecast fields) than the previously produced CAMS interim reanalysis. The CAMS reanalysis has smaller biases compared with most of the independent ozone, carbon monoxide, nitrogen dioxide and aerosol optical depth observations used for validation in this paper than the previous two reanalyses and is much improved and more consistent in time, especially compared to the MACC reanalysis. The CAMS reanalysis is a dataset that can be used to compute climatologies, study trends, evaluate models, benchmark other reanalyses or serve as boundary conditions for regional models for past periods.

Evaluation of Regional CO2 Mole Fractions in the ECMWF CAMS Real‐Time Atmospheric Analysis and NOAA CarbonTracker Near‐Real‐Time Reanalysis With Airborne Observations From ACT‐America Field Campaigns

“…CAMS is an atmospheric analysis produced by the Copernicus Atmosphere Monitoring Service focusing on atmospheric composition including aerosols, chemical species, and greenhouse gases (Inness et al, ; Massart et al, ). The CAMS analysis is produced using the ECMWF four‐dimensional variational (4DVar) system (Engelen & McNally, ) within the Integrated Forecasting System (IFS; version CY42r1 for 2016 and CY43r1 for 2017), which is one of the world's leading operational global weather prediction systems.…”

An intercomparison of tropospheric ozone reanalysis products from CAMS, CAMS interim, TCR-1, and TCR-2

“…A priori anthropogenic emissions of NO x and CO were obtained from the HTAP version 2 inventory for 2008 and 2010 (Janssens-Maenhout et al, 2015). Emissions from biomass burning are based on the monthly GFED version 4.2 inventory (Randerson et al, 2018) for NO x and CO, while those from soils are based on the monthly GEIA inventory (Graedel et al, 1993) for NO x .…”

Present‐Day and Historical Aerosol and Ozone Characteristics in CNRM CMIP6 Simulations

“…Table presents additional statistics for the AOD and AAOD, namely, their means calculated separately over land and ocean for CNRM‐CM6‐1, MACv2, the MERRA‐2 aerosol reanalysis (Randles et al, ), and the CAMS reanalysis project (Inness et al, ). It confirms the too low CNRM‐CM6‐1 AOD, and it indicates that most of the global bias in AOD comes from a bias over land.…”