The MACC reanalysis: an 8 yr data set of atmospheric composition
Inness , A.
Baier , F.
Benedetti , A.
Bouarar , Idir
Chabrillat , S.
Clark , H.
Clerbaux , Cathy
Coheur , P.
Engelen , R. J.
Errera , Q.
Flemming , J.
George , Maya
Granier , Claire
Hadji-Lazaro , Juliette
Huijnen , V.
Hurtmans , D.
Jones , L.
Kaiser , J. W.
Kapsomenakis , J.
Lefever , K.
Leitão , J.
Razinger , M.
Richter , A.
Schultz , M. G.
Simmons , A. J.
Suttie , M.
Stein , O.
Thépaut , J.-N.
Thouret , V.
Vrekoussis , M.
view all 31 authors
- Publisher: European Geosciences Union
(issn: 1680-7324, eissn: 1680-7324)
[ PHYS.PHYS.PHYS-AO-PH ] Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph] | Deutsches Fernerkundungsdatenzentrum
An eight-year long reanalysis of atmospheric composition data covering the
period 2003–2010 was constructed as part of the FP7-funded Monitoring
Atmospheric Composition and Climate project by assimilating satellite data
into a global model and data assimilation system. This reanalysis provides
fields of chemically reactive gases, namely carbon monoxide, ozone, nitrogen
oxides, and formaldehyde, as well as aerosols and greenhouse gases globally
at a horizontal resolution of about 80 km for both the troposphere and the
stratosphere. This paper describes the assimilation system for the reactive
gases and presents validation results for the reactive gas analysis fields
to document the data set and to give a first indication of its quality.
Tropospheric CO values from the MACC reanalysis are on average 10–20%
lower than routine observations from commercial aircrafts over airports
through most of the troposphere, and have larger negative biases in the
boundary layer at urban sites affected by air pollution, possibly due to an
underestimation of CO or precursor emissions.
Stratospheric ozone fields from the MACC reanalysis agree with ozonesondes
and ACE-FTS data to within ±10% in most seasons and regions. In the
troposphere the reanalysis shows biases of −5% to +10% with respect
to ozonesondes and aircraft data in the extratropics, but has larger
negative biases in the tropics. Area-averaged total column ozone agrees with
ozone fields from a multi-sensor reanalysis data set to within a few percent.
NO<sub>2</sub> fields from the reanalysis show the right seasonality over polluted
urban areas of the NH and over tropical biomass burning areas, but
underestimate wintertime NO<sub>2</sub> maxima over anthropogenic pollution regions
and overestimate NO<sub>2</sub> in northern and southern Africa during the tropical
biomass burning seasons.
Tropospheric HCHO is well simulated in the MACC reanalysis even though no
satellite data are assimilated. It shows good agreement with independent
SCIAMACHY retrievals over regions dominated by biogenic emissions with some
anthropogenic input, such as the eastern US and China, and also over African
regions influenced by biogenic sources and biomass burning.