Journal article

Kalman filter analysis of ice core data - 2. Double deconvolution of CO2 and delta C-13 measurements

CM Trudinger, IG Enting, PJ Rayner, RJ Francey

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES | AMER GEOPHYSICAL UNION | Published : 2002

Abstract

A new method for deconvolving ice core CO2 and δ 13CO2 measurements to estimate net CO2 uptake by the terrestrial biosphere and the oceans has been developed. The method, which uses the Kalman filter, incorporates statistical analysis into the calculation. This allows a more rigorous analysis of CO2 variability than the usual deconvolution method. The Kalman filter method estimates uncertainties on the deduced fluxes as part of the calculation. The deconvolution method is applied to the Law Dome CO2 and δ 13C ice core record. The calculation suggests that natural variability in CO2 fluxes may be as large as 1 GtC yr-1 (GtC is gigatonnes carbon, 1 Gt = 1015 g) on the timescale of just less th..

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