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Control of the glacial carbon budget by topographically induced mixing
Stockholm University, Faculty of Science, Department of Geological Sciences.
2014 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 41, no 12, 4277-4284 p.Article in journal (Refereed) Published
Abstract [en]

Evidence for the oceanic uptake of atmospheric CO2 during glaciations suggests that there was less production of southern origin deep water but, paradoxically, a larger volume of southern origin water than today. Here we demonstrate, using a theoretical box model, that the inverse relationship between volume and production rate of this water mass can be explained by invoking mixing rates in the deep ocean that are proportional to topographic outcropping area scaled with ocean floor slope. Furthermore, we show that the resulting profile, of a near-linear decrease in mixing intensity away from the bottom, generates a positive feedback on CO2 uptake that can initiate a glacial cycle. The results point to the importance of using topography-dependent mixing when studying the large-scale ocean circulation, especially in the paleo-intercomparison models that have failed to produce the weaker and more voluminous bottom water of the Last Glacial Maximum.

Place, publisher, year, edition, pages
2014. Vol. 41, no 12, 4277-4284 p.
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-107444DOI: 10.1002/2014GL059963ISI: 000340294300023OAI: oai:DiVA.org:su-107444DiVA: diva2:747593
Note

AuthorCount:2;

Available from: 2014-09-17 Created: 2014-09-15 Last updated: 2017-12-05Bibliographically approved

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