Changes in the Arctic Ocean CO
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Manizza_ArctiCO2sink_GBC_2013.pdf
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Author(s)
Menemenlis, D.
Key, R. M.
Manizza, Manfredi
Follows, Michael J
Dutkiewicz, Stephanie
Hill, Christopher N.
Date Issued
October 2013
Journal
Global Biogeochemical Cycles
Publisher
American Geophysical Union (AGU)
Citation
Manizza, M., M. J. Follows, S. Dutkiewicz, D. Menemenlis, C. N. Hill, and R. M. Key. “Changes in the Arctic Ocean CO2sink (1996-2007): A Regional Model Analysis.” Global Biogeochemical Cycles 27, no. 4 (November 19, 2013): 1108–1118.
Version
Final published version
Abstract
The rapid recent decline of Arctic Ocean sea ice area increases the flux of solar radiation available for primary production and the area of open water for air-sea gas exchange. We use a regional physical-biogeochemical model of the Arctic Ocean, forced by the National Centers for Environmental Prediction/National Center for Atmospheric Research atmospheric reanalysis, to evaluate the mean present-day CO[subscript 2] sink and its temporal evolution. During the 1996-2007 period, the model suggests that the Arctic average sea surface temperature warmed by 0.04°C a[superscript -1], that sea ice area decreased by ∼0.1 × 106 km2 a][superscript -1], and that the biological drawdown of dissolved inorganic carbon increased. The simulated 1996-2007 time-mean Arctic Ocean CO[subscript 2] sink is 58 ± 6 Tg C a[superscript -1]. The increase in ice-free ocean area and consequent carbon drawdown during this period enhances the CO[subscript 2] sink by ∼1.4 Tg C a[superscript -1], consistent with estimates based on extrapolations of sparse data. A regional analysis suggests that during the 1996-2007 period, the shelf regions of the Laptev, East Siberian, Chukchi, and Beaufort Seas experienced an increase in the efficiency of their biological pump due to decreased sea ice area, especially during the 2004-2007 period, consistent with independently published estimates of primary production. In contrast, the CO[subscript 2] sink in the Barents Sea is reduced during the 2004-2007 period due to a dominant control by warming and decreasing solubility. Thus, the effect of decreasing sea ice area and increasing sea surface temperature partially cancel, though the former is dominant. Keywords: Arctic Ocean, sea ice, ocean productivity
MIT Department
Massachusetts Institute of Technology. Center for Global Change Science
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1002/2012GB004491
