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Title: A model of the Earth's Dole effect
Authors: Hoffmann, G.
Cuntz, M.
Weber, C.
Ciais, P.
Friedlingstein, P.
Heimann, Martin
Jouzel, J.
Kaduk, Jörg
Maier-Reimer, E.
Seibt, U.
Six, K.
First Published: 16-Jan-2004
Publisher: American Geophysical Union
Citation: Global Biogeochemical Cycles, 2004, 18 (1), GB1008
Abstract: The Earth's Dole effect describes the isotopic [superscript 18]O/[superscript 16]O-enrichment of atmospheric oxygen with respect to ocean water, amounting under today's conditions to 23.5‰. We have developed a model of the Earth's Dole effect by combining the results of three-dimensional models of the oceanic and terrestrial carbon and oxygen cycles with results of atmospheric general circulation models (AGCMs) with built-in water isotope diagnostics. We obtain a range from 22.4‰ to 23.3‰ for the isotopic enrichment of atmospheric oxygen. We estimate a stronger contribution to the global Dole effect by the terrestrial relative to the marine biosphere in contrast to previous studies. This is primarily caused by a modeled high leaf water enrichment of 5–6‰. Leaf water enrichment rises by ∼1‰ to 6–7‰ when we use it to fit the observed 23.5‰ of the global Dole effect. The present model is designed to be utilized in forthcoming paleo studies allowing a quantitative analysis of long-term observations from polar ice cores.
DOI Link: 10.1029/2003GB002059
ISSN: 0886-6236
eISSN: 1944-9224
Version: Publisher Version
Status: Peer-reviewed
Type: Article
Rights: Copyright © 2004, American Geophysical Union. Deposited with reference to the publisher’s archiving policy available on the SHERPA/RoMEO website.
Appears in Collections:Published Articles, Dept. of Geography

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