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24.09.2018

Copernicus releases new global reanalysis data set on atmospheric composition

The goal of reanalysis is to create a consistent data set over a certain period of time. The new Copernicus Atmosphere Monitoring Service (CAMS) reanalysis data set provides consistent information on aerosols and reactive gases using a fully integrated atmospheric composition modelling system. Upgrades compared to the previous data sets include improved global horizontal resolution of approximately 80 km, a refined temporal resolution of 3 hours, and the availability of more chemical species. The new reanalysis also uses additional satellite data sets and a recent, and therefore improved, version of ECMWF’s Integrated Forecasting System (IFS).

CAMS Global Reanalysis - Carbon Monoxide Period 2003–2016 
Quelle: Copernicus Atmosphere Monitoring Service, ECMWF Quelle: Copernicus Atmosphere Monitoring Service, ECMWF

The Copernicus Atmosphere Monitoring Service (CAMS) has now released the full period of its new global reanalysis data set of atmospheric composition and meteorology for 2003–2016.

Reanalysis is a data assimilation process in which observations from past and current satellite instruments are combined with state-of-the-art computer models. Satellite observations often have gaps where instruments have failed or clouds have obscured the view, for instance, and inconsistencies may occur because of a difference in resolution between instruments. The goal of reanalysis is to create a consistent data set over a certain period of time.

The new CAMS reanalysis data set provides consistent information on aerosols and reactive gases using a fully integrated atmospheric composition modelling system based on ECMWF’s Integrated Forecasting System (IFS) and follows in the footsteps of the earlier MACC reanalysis and CAMS interim reanalysis. Upgrades compared to the previous data sets include improved global horizontal resolution of approximately 80 km, a refined temporal resolution of 3 hours, and the availability of more chemical species. The new reanalysis also uses additional satellite data sets and a recent, and therefore improved, version of the IFS.

Richard Engelen, Deputy Head of CAMS says: “The new CAMS reanalysis provides a much-improved data set supporting our users in their endeavour to study the atmosphere or develop their applications.”

CAMS reanalysis data serve a multitude of users from application developers to scientists and policy makers. Scientists can use reanalysis data to analyse the state of the atmosphere and look at trends that have developed over the past years or decades. It is also possible to use reanalysis to interpret certain events by looking at the ‘bigger picture’. For instance, if one year it has been really hot and there were many wildfires, this will affect air pollution. To properly analyse the effect this has, it is necessary to be able to compare this with historical data.

“Reanalysis combines the best of both as it provides the information for the affected year or region, but it also gives the data for ‘normal’ years,” Engelen continues.

Before releasing this new data set, CAMS has carefully assessed the quality and this is documented in a comprehensive report. Information on how to access the freely available reanalysis data can be found on the ECMWF Copernicus Knowledge Base, where detailed documentation is also provided. The reanalysis will be kept up-to-date with new observations as they become available.

Read this and more at Copernicus’ website

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