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Temporal relationships of carbon cycling and ocean circulation at glacial boundaries.

Research paper by Alexander M AM Piotrowski, Steven L SL Goldstein, Sidney R SR Hemming, Richard G RG Fairbanks

Indexed on: 26 Mar '05Published on: 26 Mar '05Published in: Science



Abstract

Evidence from high-sedimentation-rate South Atlantic deep-sea cores indicates that global and Southern Ocean carbon budget shifts preceded thermohaline circulation changes during the last ice age initiation and termination and that these were preceded by ice-sheet growth and retreat, respectively. No consistent lead-lag relationships are observed during abrupt millennial warming events during the last ice age, allowing for the possibility that ocean circulation triggered some millenial climate changes. At the major glacial-interglacial transitions, the global carbon budget and thermohaline ocean circulation responded sequentially to the climate changes that forced the growth and decline of continental ice sheets.