Biogeosciences www.biogeosciences.net 1726-4170 1726-4189 5 4 2008 10.5194/bg-5-1189-2008 http://www.biogeosciences.net/5/1189/2008/ http://www.biogeosciences.net/5/1189/2008/bg-5-1189-2008.html http://www.biogeosciences.net/5/1189/2008/bg-5-1189-2008.pdf 1189 1197 2008-08-27 Effects of storms on primary productivity and air-sea CO₂ exchange in the subarctic western North Pacific: a modeling study M. Fujii mfujii@ees.hokudai.ac.jp Y. Yamanaka Sustainability Governance Project, Center for Sustainability Science, Hokkaido University, N9W8, Kita-ku, Sapporo, Hokkaido 060-0809, Japan Graduate School of Environmental Science, Hokkaido University, N10W5, Kita-ku, Sapporo, Hokkaido 060-0810, Japan Frontier Research System for Global Change, 3173-25 Showa-machi, Kanazawa-ku, Yokohama, Kanagawa 236-0001, Japan Biogeochemical responses of the open ocean to storms and their feedback to climate are still poorly understood. Using a marine ecosystem model, we examined biogeochemical responses to the storms in the subarctic western North Pacific. The storms in summer through early autumn enhance net community production by wind-induced nutrient injections into the surface waters while the storms in the other seasons reduce net community production by intensifying light limitation on the phytoplankton growth due to vertical dilution of the phytoplankton. The two compensating effects diminish the storm-induced annual change of net community production to only 1%. On the contrary, the storms reduce the annual oceanic uptake of the atmospheric CO₂ by 3%, resulting from storm-induced strong winds. 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