Ice core evidence for the extent of past atmospheric CO2 change due to iron fertilisation

Röthlisberger, R.; Bigler, M.; Wolff, E. W.; Joos, F.; Monnin, E.; Hutterli, M. A. (2004). Ice core evidence for the extent of past atmospheric CO2 change due to iron fertilisation. Geophysical Research Letters, 31(16) American Geophysical Union 10.1029/2004GL020338

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An extended high-resolution ice core record of dust deposition over the past 60 ka from Dome C, Antarctica, is presented. The data are in conflict with the idea that changes in aeolian iron input into the Southern Ocean were the major cause for the 80 ppm glacial-interglacial CO2 increase. During the deglaciation, the CO2 increase shows a linear relationship with the fall of the logarithm of the nss-Ca2+ flux, a proxy for dust deposition. However, the very large variations in the nss-Ca2+ flux related to the glacial Antarctic warm events A1 to A4 were accompanied by small CO2 variations only. Our data-based analysis suggests that decreased Southern Ocean dust deposition caused at most a 20 ppm increase in CO2 at the last glacial-interglacial transition. Rapid decreases in dust deposition to the northern Pacific could have been responsible for a maximum of 8 ppm in addition.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Climate and Environmental Physics

UniBE Contributor:

Bigler, Matthias; Joos, Fortunat and Hutterli, Manuel

Subjects:

500 Science > 530 Physics

ISSN:

0094-8276

Publisher:

American Geophysical Union

Language:

English

Submitter:

BORIS Import 2

Date Deposited:

06 Sep 2021 09:30

Last Modified:

05 Dec 2022 15:52

Publisher DOI:

10.1029/2004GL020338

BORIS DOI:

10.48350/158451

URI:

https://boris.unibe.ch/id/eprint/158451

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