A sediment and organic carbon budget for the greater Strait of Georgia |
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| Institution: | 1. Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, 00143 Roma, Italy;2. Dipartimento di Scienze della Terra, dell''Ambiente e delle Risorse, Università di Napoli Federico II, Largo San Marcellino 10, 80138 Napoli, Italy;1. Department of Electrical Power Systems, Kaunas University of Technology, Studentu 50, LT-51368 Kaunas, Lithuania;2. Department of Information Systems, Kaunas University of Technology, Studentu 50, LT-51368 Kaunas, Lithuania;3. Intelligent Systems Laboratory, Centre for Applied Intelligent Systems Research, Halmstad University, Kristian IV:s väg 3, PO Box 823, S-301 18 Halmstad, Sweden;4. Marine Science and Technology Centre, Klaipeda University, Herkaus Manto 84, LT-92294 Klaipeda, Lithuania;5. Department of Marine Research, Environmental Protection Agency, Taikos Av. 26, LT-91144 Klaipeda, Lithuania;1. Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research (AWI), Am Alten Hafen 26, D-27568 Bremerhaven, Germany;2. University of Bremen, Department of Geoscience, Klagenfurter Straße 4, 28359 Bremen, Germany;3. Geological Survey of Sweden, SGU, Villavägen 18, 751 28 Uppsala, Sweden |
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| Abstract: | Recent efforts to construct global ocean budgets for carbon have recognized the importance of continental margins. In this study, we constructed budgets for the Strait of Georgia, a temperate, North American west coast basin that receives the inflow of one of the world's major rivers. Drawing from published and unpublished data, we have estimated the magnitude of the various sources and sinks of fresh water, sediment and organic carbon.The Fraser River is the dominant source of fresh water and particles to the strait, contributing approximately 73% of the 158×109 m3 year?1 of water and 64% of the 30×109 kg year?1 of particles. Other rivers supply most of the remainder, while rain, groundwater and anthropogenic sources of water and particles are negligible in comparison. Fresh water escapes the Strait of Georgia through Juan de Fuca Strait, but particulate inputs are approximately balanced by sedimentation within the greater Strait of Georgia, implying almost complete trapping of particles.Dissolved and particulate organic carbon are derived mainly from in situ primary production (855×106 kg year?1) and from the Fraser River (550×106 kg year?1). Other rivers contribute 200×106 kg year?1 of organic carbon, and anthropogenic sources (ocean dumping, sewage, pulp mills and aquaculture) a further 119×106 kg year?1. Particulate organic carbon is predominantly buried (428×106 kg year?1) or oxidized (90×106 kg year?1) in the sediments of the strait. About 70% of the organic carbon that enters or is produced in the strait is dissolved. Most of the dissolved organic carbon is oxidized within the strait (784×106 kg year?1), but the remainder (400×106 kg year?1) is exported to the Pacific Ocean. Although the particulate organic carbon budget by itself implies net autotrophy, dissolved organic carbon oxidation may make the Strait of Georgia slightly net heterotrophic. |
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