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The Monitoring Atmospheric Composition and Climate (MACC) Reanalysis is a global reanalysis data set of atmospheric composition (AC), made available by the Copernicus Atmosphere Monitoring Service (CAMS). The dataset spans the period 2003 to 2012. The spatial resolution of the data set is approximately 80 km (T255 spectral) on 60 vertical levels from the surface up to 0.1 hPa for the analysed species and 1.125° by 1.125° at the same 60 levels for the other chemical species.
The MACC Reanalysis was constructed by assimilating satellite data into a global model and data assimilation system. This data assimilation system is based on a 2010 release of the Integrated Forecast System (IFS) (Cy36r1). The chemistry transport model MOZART (Model for OZone And Related chemical Tracers) was coupled to the IFS to provide initial fields and chemical production and loss rates for the reactive gases (Flemming et al. 2009). The system includes a 4-dimensional variational analysis (4D-Var) with a 12-hour analysis window and provides analysis fields of atmospheric composition species, namely ozone (O3), carbon monoxide (CO), nitrogen oxides (NOx), SO2, formaldehyde (HCHO), and aerosols, in addition to meteorological fields. Additional reactive gases species are available from the coupled chemistry transport model MOZART.
The output of the reanalysis has been validated by the MACC-II VAL sub-project and the latest information is available in a validation report.
An open-access journal article describing the chemistry part of the MACC reanalysis is available from Atmospheric Chemistry and Physics (Inness et al. 2013). Inness et al. (2013) also lists which atmospheric composition data sets were assimilated in the MACC reanalysis.
We are aware of several quality issues with MACC reanalysis data (see known issues section below).
How to access MACC Reanalysis data and charts/maps?
MACC data is open access (under licence) and free to download.
MACC data can be searched through the CAMS Catalogue (select 'Global reanalyses' in the 'Product Family' section).
The MACC reanalysis data can be downloaded from the ECMWF Data Server or via WebAPI. Those with MARS access may directly retrieve the data from MARS (class=mc, expver=rean) for all analysed species as well as the meteorology. The additional chemical species from the coupled MOZART model are available upon request from the ECMWF ECFS archive (contact Copernicus User Support) in NetCDF format.
MACC Reanalysis maps are also available.
MACC reanalysis parameters listings
The archive of available MACC parameters can be browsed here.
Availability of parameters varies with the type of level selected (model levels, pressure levels or surface).
Known issues
Sea salt aerosol mixing ratio above freshwater: The model is not distinguishing between sea and freshwater in the context of sea-salt emissions. Unfortunately, this appears to affect all cycles from the MACC reanalysis. A fix is planned to be implemented in a future model release (45r1) and will be effective from the implementation date on. This means that the fix will not be retrospective for the MACC reanalysis but will be in future reanalysis.
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