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dc.contributor.supervisorPapakyriakou, Tim (Environment and Geography)en_US
dc.contributor.authorElse, Brent
dc.date.accessioned2012-09-21T13:33:09Z
dc.date.available2012-09-21T13:33:09Z
dc.date.issued2011-06-14en_US
dc.date.issued2012-04-06en_US
dc.date.issued2012en_US
dc.date.issued2012en_US
dc.identifier.citationElse, B. G. T., T. N. Papakyriakou, R. J. Galley, W. M. Drennan, L. A. Miller, and H. Thomas (2011), Wintertime CO2 fluxes in an Arctic polynya using eddy covariance: Evidence for enhanced air-sea gas transfer during ice formation, J. Geophys. Res., 116, C00G03, doi:10.1029/2010JC006760.en_US
dc.identifier.citationElse, B. G. T., T. N. Papakyriakou, R. J. Galley, A. Mucci, M. Gosselin, L. A. Miller, E. H. Shadwick, and H. Thomas (2012), Annual cycles of pCO2sw in the southeastern Beaufort Sea: New understandings of air-sea CO2 exchange in arctic polynya regions, J. Geophys. Res., 117, C00G13, doi:10.1029/2011JC007346.en_US
dc.identifier.citationElse, B. G. T., R. J. Galley, T. Papakyriakou, L. A. Miller, A. Mucci, and D. G. Barber (2012), Sea Surface pCO2 Cycles and CO2 Fluxes at Landfast Sea Ice Edges in Amundsen Gulf, Canada, J. Geophys. Res., doi:10.1029/2012JC007901, in press.en_US
dc.identifier.citationElse, B.G.T., Papakyriakou, T.N., Galley, R.J., Miller, L.A., Mucci, A., Asplin, M.G. and D. Barber. An annual air–sea CO2 flux budget for the Cape Bathurst polynya region. Global Biogeochem. Cy., in reviewen_US
dc.identifier.urihttp://hdl.handle.net/1993/8905
dc.description.abstractDuring the fourth International Polar Year, an interdisciplinary study was conducted to examine the couplings between sea ice, ocean, atmosphere, and ecosystem in the southeastern Beaufort Sea. This thesis examines components of the system that control the air–sea exchange of carbon dioxide. Using eddy covariance measurements, we found enhanced CO2 exchange associated with new ice formation in winter flaw leads. This exchange was typically directed towards the surface, although we also measured one instance of outgassing. Sea surface dissolved CO2 measurements (pCO2sw) in Amundsen Gulf showed significant undersaturation with respect to the atmosphere at freeze–up, followed by a slow increase over the winter until spring phytoplankton blooms caused strong undersaturation at break–up. Over the summer, pCO2sw increased until becoming slightly supersaturated due to surface warming. Along the southern margins of Amundsen Gulf and on the Mackenzie Shelf we found pCO2sw supersaturations in the fall due to wind–driven coastal upwelling. In the spring, this upwelling occurred along the landfast ice edges of Amundsen Gulf. By combining observations of enhanced winter gas exchange with observations of pCO2sw in Amundsen Gulf, we derived an annual budget of air–sea CO2 exchange for the region. This exercise showed that uptake through the winter season was as important as the open water season, making the overall annual uptake of CO2 about double what had previously been calculated. Prior to this work, the prevailing paradigm of air–sea CO2 cycling in Arctic polynya regions posited that strong CO2 absorption occurs in the open water seasons, and that a potential outgassing during the winter is inhibited by the sea ice cover. As a new paradigm, we propose that the spatial and temporal variability of many processes – including phytoplankton blooms, sea surface temperature and salinity changes, upwelling, river input, continental shelf processes, and the potential for high rates of winter gas exchange – need to be considered in order to understand the carbon source/sink status of a given Arctic polynya region. A paradigm that considers such varied processes is useful in understanding how climate change in the Arctic can impact air–sea CO2 exchange.en_US
dc.language.isoengen_US
dc.publisherAmerican Geophysical Unionen_US
dc.publisherAmerican Geophysical Unionen_US
dc.publisherAmerican Geophysical Unionen_US
dc.publisherAmerican Geophysical Unionen_US
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectAir-sea gas transferen_US
dc.subjectCarbon Dioxideen_US
dc.subjectSea Iceen_US
dc.subjectPolynyaen_US
dc.subjectArcticen_US
dc.titleAir-sea CO2 cycling in the southeastern Beaufort Seaen_US
dc.typeinfo:eu-repo/semantics/doctoralThesis
dc.typedoctoral thesisen_US
dc.degree.disciplineEnvironment and Geographyen_US
dc.contributor.examiningcommitteeBarber, David (Environment and Geography) Amiro, Brian (Soil Science) Borges, Alberto (University of Liege)en_US
dc.degree.levelDoctor of Philosophy (Ph.D.)en_US
dc.description.noteOctober 2012en_US


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