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Free keywords:
ice core, firn, carbon cycle, terrestrial, carbon dioxide
Long-term variability; last 1000 years; atmospheric histories; terrestrial biosphere; carbon uptake; climate; firn; air; delta-c-13; record
Abstract:
Ice core records are commonly used to infer information about past variability of CO2 fluxes. Because of processes involved in enclosing this air in ice, ice core records are a smoothed representation of the actual past atmospheric variations. As such, there is a limit to how much information ice core measurements can contain about flux variability on short timescales. With a numerical model of the firn processes we quantify this smoothing and describe how it can be reproduced with pulse response functions. We generate and make available pulse response functions for CO2 at the DE08 site on Law Dome, Antarctica. We discuss implications of the smoothing for inferring CO2 flux variability from the Law Dome ice core record. In particular we look at results from an intercomparison of terrestrial biosphere models over the twentieth century and show how much of the CO2 variability would be reflected in the Law Dome ice core record. We also smooth atmospheric delta(13)CO(2) from a study that compared fixed and varying isotopic discrimination. We find that the impact of changing discrimination, shown previously to be large on interannual timescales, is small on the decadal scales accessible from ice core records.
