Uptake and sequestration of atmospheric CO2 in the Labrador Sea deep convection region.

DeGrandpre, M. D., Körtzinger, Arne , Send, Uwe, Wallace, Douglas W.R. and Bellerby, R. G. J. (2006) Uptake and sequestration of atmospheric CO2 in the Labrador Sea deep convection region. Open Access Geophysical Research Letters, 33 (L21S03). DOI 10.1029/2006GL026881.

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Abstract

The Labrador Sea is an important area of deep water formation and is hypothesized to be a significant sink for atmospheric CO2 to the deep ocean. Here we examine the dynamics of the CO2 system in the Labrador Sea using time-series data obtained from instrumentation deployed on a mooring near the former Ocean Weather Station Bravo. A 1-D model is used to determine the air-sea CO2 uptake and penetration of the CO2 into intermediate waters. The results support that mixed-layer pCO2 remained undersaturated throughout most of the year, ranging from 220 μatm in mid-summer to 375 μatm in the late spring. Net community production in the summer offset the increase in pCO2 expected from heating and air-sea uptake. In the fall and winter, cooling counterbalanced a predicted increase in pCO2 from vertical convection and air-sea uptake. The predicted annual mean air to sea flux was 4.6 mol m−2 yr−1 resulting in an annual uptake of 0.011 ± 0.005 Pg C from the atmosphere within the convection region. In 2001, approximately half of the atmospheric CO2 penetrated below 500 m due to deep convection.

Document Type: Article
Keywords: Biogeosciences: Biogeochemical cycles, processes, and modeling Oceanography: Biological and Chemical: Carbon cycling, Oceanography: Biological and Chemical: Gases, Oceanography: Biological
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1029/2006GL026881
ISSN: 0094-8276
Projects: SFB460, CARBOOCEAN
Date Deposited: 03 Dec 2008 16:52
Last Modified: 19 Feb 2018 13:43
URI: http://oceanrep.geomar.de/id/eprint/7278

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