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The MacC Reanalysis: an 8-yr Data Set of Atmospheric Composition : Volume 12, Issue 12 (05/12/2012)

By Inness, A.

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Book Id: WPLBN0003973743
Format Type: PDF Article :
File Size: Pages 101
Reproduction Date: 2015

Title: The MacC Reanalysis: an 8-yr Data Set of Atmospheric Composition : Volume 12, Issue 12 (05/12/2012)  
Author: Inness, A.
Volume: Vol. 12, Issue 12
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Team, T. M., Bouarar, I., Huijnen, V., Hadji-Lazaro, J., Vrekoussis, M., Flemming, J.,...Kaiser, J. W. (2012). The MacC Reanalysis: an 8-yr Data Set of Atmospheric Composition : Volume 12, Issue 12 (05/12/2012). Retrieved from

Description: ECMWF, Reading, UK. 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 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 gases analysis fields to document the dataset 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 ozone sondes and ACE-FTS data to within ±10% in most situations. In the troposphere the reanalysis shows biases of −5% to +10% with respect to ozone sondes 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.

NO2 fields from the reanalysis show the right seasonality over polluted urban areas of the NH and over tropical biomass burning areas, but underestimate wintertime NO2 maxima over anthropogenic pollution regions and overestimate NO2 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.

The MACC reanalysis: an 8-yr data set of atmospheric composition

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