Please acknowledge the use of CAMS data as stated in the license agreement:
"Where the Licensee communicates to the public or distributes or publishes CAMS Information, the Licensee shall inform the recipients of the source of that information by using the following or any similar notice: 'Generated using Copernicus Atmosphere Monitoring Service Information [Year]'.
Where the Licensee makes or contributes to a publication or distribution containing adapted or modified CAMS Information, the Licensee shall provide the following or any similar notice: 'Contains modified Copernicus Atmosphere Monitoring Service Information [Year]';
Any such publication or distribution shall state that neither the European Commission nor ECMWF is responsible for any use that may be made of the information it contains."
You also might want to reference this paper which describes the data in more detail:
Agusti-Panareda, A, Massart, S, Chevallier, F, Balsamo, G, Boussetta, S, Dutra, E, Beljaars, A (2016):
A biogenic C02 flux adjustment scheme for the mitigation of large-scale biases in global atmospheric CO2 analyses and forecasts
ECMWF Technical Memorandum 773
http://www.ecmwf.int/en/elibrary/15374-biogenic-c02-flux-adjustment-scheme-mitigation-large-scale-biases-global
