Computer Science
Scientific paper
Feb 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004e%26psl.218..317r&link_type=abstract
Earth and Planetary Science Letters, Volume 218, Issue 3-4, p. 317-330.
Computer Science
8
O-18, Paleoclimatology, Modelling
Scientific paper
An Earth system model of intermediate complexity, CLIMBER-2, is used to simulate the oxygen-18 content of the water masses (H182O) in the oceans. Firstly, we forced CLIMBER-2 with the fluxes from the atmospheric general circulation model ECHAM. Simulated oceanic 18O fields for the present day are in good agreement with data. Secondly, a water isotope module was developed to transport δ18O in the atmosphere on a large scale and compute the 18O fluxes to the ocean at the atmosphere-ocean interface using only variables already computed by CLIMBER-2. For the present day, we successfully represent oxygen-18 distribution in the Atlantic, Indian and Pacific oceans, and close agreement is also found when we compare modelled and observed δ18Ow:salinity relationships. During the Last Glacial Maximum (LGM), we find that the major differences in the 18O oceanic fields (apart from the global oceanic enrichment due to ice-sheet build-up) are due to surface condition changes (surface temperature, shift in bottom water formation zones) and that no drastic changes occurred in the δ18Ow:salinity spatial relationship. In addition, we compute a calcite δ18Oc field for the Atlantic and compare it to the available data to assess the variation between the LGM and the present day.
Ganopolski Andrey
Hoffmann Georg
Paillard Didier
Roche Daniel
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