Service Communautaire d'Information sur la Recherche et le Développement - CORDIS

FP5

CAMELS Résumé de rapport

Project ID: EVK2-CT-2002-00151
Financé au titre de: FP5-EESD
Pays: France

Atmospheric CO2 dataset

The historical CO2 forcing is provided (following Rayner and Trudinger, CSIRO) as annual mean concentration taken from a spline fit to the ice core record from Law Dome Antarctica (Etheridge et al. 1996) and a combined atmospheric record from the South Pole and Mauna Loa records of the Scripps Institute of Oceanography (Keeling et al. 1995).

The atmospheric record is calculated as a weighted sum (0.75<mlo + 0.25 spo), which is a good fit to the global mean marine boundary layer value from the Globalview compilation when both records overlap. The Law Dome values have been adjusted to bring both records onto the same calibration scale. The spline uses different weightings for different periods to account for varying data density (see Enting 1987 for details of the smoothing spline algorithm). Throughout it is arranged to preserve decadal-scale variability but suppress shorter-term variations.

Before 1960 (in the period covered by the ice core measurements) it produces a 50% attenuation at frequencies less than about 20 years, during the period of the atmospheric record this frequency cut-off drops to about 12 years.

The contemporary dataset is based on the AEROCARB project database. The objective of this database is to organise the existing atmospheric CO2 observations made in Europe into one single network and to document it. This will provide a single, coherent dataset that can be used in models to retrieve the European CO2 fluxes. This database is a cooperative effort to unify the dataset of many European institutions involved in high-quality atmospheric CO2 measurements. The AEROCARB database contains data from January 1997 to December 2001. The data can be recorded by site (& heights) and year.

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Contact

Jean-Paul CARESSA
Tél.: +33-1-69087711
Fax: +33-1-69087716
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