The imprint of anthropogenic CO2 in the Arctic Ocean: evidence from planktic δ13C data from watercolumn and sediment surfaces.

Bauch, Dorothea , Carstens, J., Wefer, Gerold and Thiede, Jörn (2000) The imprint of anthropogenic CO2 in the Arctic Ocean: evidence from planktic δ13C data from watercolumn and sediment surfaces. Deep-Sea Research Part II-Topical Studies in Oceanography, 47 (9-11). pp. 1791-1808. DOI 10.1016/S0967-0645(00)00007-2.

[img] Text
2000_Bauch_etal_DSR_2.pdf - Published Version
Restricted to Registered users only

Download (379Kb) | Contact

Supplementary data:

Abstract

δ13C values of N. pachyderma (sin.) from the water column and from core top sediments are compared in order to determine the 13C decrease caused by the addition of anthropogenic CO2 to the atmosphere. This effect, which is referred to as the surface ocean Suess effect, is estimated to be about −0.9‰(±0.2‰) within the Arctic Ocean halocline waters and to about −0.6‰(±0.1‰) in the Atlantic-derived waters of the southern Nansen Basin. This means that the area where the Arctic Ocean halocline waters are formed, the Arctic shelf regions, are relatively well ventilated with respect to CO2. Nevertheless, δ13C of dissolved inorganic carbon (δ13CDIC) in the Arctic Ocean halocline waters is far from isotopic equilibrium. Absolute values of δ13C of N. pachyderma (sin.) covary with the surface ocean Suess effect, and we interprete changes in both parameters as a reflection of the degree of ventilation of the waters on the shelf sea. Measurements of δ13C of N. pachyderma (sin.) in the Arctic Ocean from plankton tows reveal a “vital effect” of about −2‰, significantly different from other published values. A first-order estimate of the total anthropogenic carbon inventory shows, that despite of its permanent sea-ice cover, the Arctic Ocean, with 2% of the global ocean area, is responsible for about 4–6% of the global ocean's CO2 uptake.

Document Type: Article
Keywords: Polar Research; Paleoceanography; Climatology; Carbon cycle; Arctic Ocean halocline waters
Research affiliation: AWI
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/S0967-0645(00)00007-2
ISSN: 0967-0645
Expeditions/Models/Experiments:
Date Deposited: 19 Apr 2012 11:45
Last Modified: 11 Oct 2016 09:28
URI: http://oceanrep.geomar.de/id/eprint/14240

Actions (login required)

View Item View Item

Document Downloads

More statistics for this item...