Computer Science
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011gecoa..75.5219f&link_type=abstract
Geochimica et Cosmochimica Acta, Volume 75, Issue 18, p. 5219-5228.
Computer Science
1
Scientific paper
C isotopes in cave drip water are affected by both the C isotope composition of soil air and host rock carbonate. Furthermore, the C isotope composition of cave drip water strongly depends on the calcite dissolution system, i.e., open, closed and intermediate conditions. Here, we present a calcite dissolution model, which calculates the 14 C activity and δ 13 C value of the dissolved inorganic carbon of the drip water. The model is based on the chemical equations describing calcite dissolution ( H 2 O + CaCO 3 + CO iff Ca 2 + 2HCO 3 - ). The most important improvement, relative to previous models, is the combination of the open and closed system conditions in order to simulate the C isotope composition during intermediate states of calcite dissolution and the application to carbon isotope measurements on cave drip waters from Grotta di Ernesto, Italy. The major changes in the C isotope composition of the drip water occur in response to variations in the open-closed system ratio. Additionally, the 14 C activity and the δ 13 C value of the drip water depend on changes in the partial pressure of soil CO 2 . Radiocarbon and δ 13 C values of the Grotta di Ernesto drip water are well reproduced by the model.
Fohlmeister Jens
Kromer Bernd
Mangini Augusto
Scholz Daniel
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