Title The Arctic Ocean marine carbon cycle; evaluation of air-sea CO2 exchanges, ocean acidification impacts and potential feedbacks
Author Bates, N.R.; Mathis, J.T.
Author Affil Bates, N.R., Bermuda Institute of Ocean Sciences, Ferry Reach, Bermuda. Other: University of Alaska Fairbanks
Source Biogeosciences, 6(11), p.2433-2459, . Publisher: Copernicus GmbH on behalf of the European Union, Katlenburg-Lindau, International. ISSN: 1726- 4170
Publication Date 2009
Notes In English. Published in Biogeosciences Discussion: 30 June 2009, http://www.biogeosciences- discuss.net/6/6695/2009/bgd-6-6695-2009.html; accessed in Feb., 2011; abstract: doi:10.5194/bg-6-2433-2009. 234 refs. GeoRef Acc. No: 308337
Index Terms brines; climatic change; diffusion; ecology; geochemical cycles; global change; global warming; heat flux; human activity; hydrologic cycle; hydrology; ice; ocean environments; meltwater; plankton; polynyas; runoff; surface waters; Arctic Ocean--Barents Sea; Arctic Ocean--Beaufort Sea; Arctic Ocean- -Chukchi Sea; Arctic Ocean--East Siberian Sea; Arctic Ocean--Eurasia Basin; Arctic Ocean--Kara Sea; Arctic Ocean--Laptev Sea; acidification; air-sea interface; arctic environment; Arctic Ocean; Barents Sea; Beaufort Sea; benthic environment; biochemistry; calcium carbonate; carbon; carbon cycle; carbon dioxide; Chukchi Sea; climate change; continental shelf; East Siberian Sea; Eurasia Basin; fresh water; geochemical cycle; Kara Sea; Laptev Sea; marine environment; mixing; organic compounds; pH; phytoplankton; saturation; sea ice; sea water; seasonal variations; Siberian shelf; sinks; surface water
Abstract At present, although seasonal sea-ice cover mitigates atmosphere-ocean gas exchange, the Arctic Ocean takes up carbon dioxide (CO2) on the order of -66 to -199 Tg C year-1 (1012 g C), contributing 5-14% to the global balance of CO2 sinks and sources. Because of this, the Arctic Ocean has an important influence on the global carbon cycle, with the marine carbon cycle and atmosphere-ocean CO2 exchanges sensitive to Arctic Ocean and global climate change feedbacks. In the near-term, further sea-ice loss and increases in phytoplankton growth rates are expected to increase the uptake of CO2 by Arctic Ocean surface waters, although mitigated somewhat by surface warming in the Arctic. Thus, the capacity of the Arctic Ocean to uptake CO2 is expected to alter in response to environmental changes driven largely by climate. These changes are likely to continue to modify the physics, biogeochemistry, and ecology of the Arctic Ocean in ways that are not yet fully understood. In surface waters, sea-ice melt, river runoff, cooling and uptake of CO2 through air-sea gas exchange combine to decrease the calcium carbonate (CaCO3) mineral saturation states (Omega ) of seawater while seasonal phytoplankton primary production (PP) mitigates this effect. Biological amplification of ocean acidification effects in subsurface waters, due to the remineralization of organic matter, is likely to reduce the ability of many species to produce CaCO3 shells or tests with profound implications for Arctic marine ecosystems.
URL http://www.biogeosciences.net/6/2433/2009/bg-6-2433-2009.pdf
Publication Type journal article
Record ID 65004965