Open AccessEffect of changes in δ 18 O content of the surface ocean on estimated sea surface temperatures in past warm climate
Author(s) -
Roche D. M.,
Donnadieu Y.,
Pucéat E.,
Paillard D.
Publication year - 2006
Publication title -
paleoceanography
Language(s) - English
Resource type - Journals
eISSN - 1944-9186
pISSN - 0883-8305
DOI - 10.1029/2005pa001220
Subject(s) - calcite , sea surface temperature , latitude , oxygen , climatology , surface water , environmental science , climate model , oceanography , climate change , ocean current , atmospheric sciences , geology , chemistry , mineralogy , organic chemistry , geodesy , environmental engineering
Using a coupled climate model of intermediate complexity including oxygen 18, CLIMBER‐2, we investigate the evolution of the distribution of surface water 18 O composition under warm climate conditions. We then determine the impact of changes of the surface water 18 O distribution on ocean surface temperatures inferred from calcite oxygen 18. Our results show that published temperature reconstructions based on oxygen 18 from calcite are systematically biased by 2° to 4°C in the absence of major oceanic circulation changes and up to 7°C in the presence of major oceanic circulation changes. As the bias introduced is shown to vary with latitude, our work has major implications on past latitudinal temperature gradient reconstructions based on oxygen 18 measurements.