PHBern

REPO PHBern
Open Access Repository Bern University of Teacher Education

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). 10.1029/2004GL020338

[img] Text
Geophysical_Research_Letters_-_2004_-_R_thlisberger_-_Ice_core_evidence_for_the_extent_of_past_atmospheric_CO2_change_due.pdf - Published Version
Restricted to registered users only
Available under License Publisher holds Copyright.

Download (195kB) | Request a copy

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)

PHBern Contributor:

Bigler, M.

ISSN:

0094-8276

Language:

English

Submitter:

Matthias Bigler

Date Deposited:

29 Jan 2024 13:23

Last Modified:

01 Feb 2024 15:59

Publisher DOI:

10.1029/2004GL020338

PHBern DOI:

10.57694/7239

URI:

https://phrepo.phbern.ch/id/eprint/7239

Actions (login required)

Edit item Edit item