Subterranean CO2 ventilation and its role in the net ecosystem carbon balance of a karstic shrubland

Details Subterranean CO2 ventilation and its role in the net ecosystem carbon balance of a karstic shrubland Subterranean CO2 ventilation and its role in the net ecosystem carbon balance of a karstic shrubland

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3809802s&link_type=abstract

Geophysical Research Letters, Volume 38, Issue 9, CiteID L09802

Physics

Atmospheric Composition And Structure: Biosphere/Atmosphere Interactions (0426, 1610), Biogeosciences: Carbon Cycling (4806)

Scientific paper

Recent studies of carbonate ecosystems suggest a possible contribution of subterranean ventilation to the net ecosystem carbon balance. However, both the overall importance of such CO2 exchange processes and their drivers remain unknown. Here we analyze several dry-season episodes of net CO2 emissions to the atmosphere, along with soil and borehole CO2 measurements. Results highlight important events where rapid decreases of underground CO2 molar fractions correlate well with sizeable CO2 release to the atmosphere. Such events, with high friction velocities, are attributed to ventilation processes, and should be accounted for by predictive models of surface CO2 exchange.

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