Fluxes and transformation of carbon in the Siberian shelf seas under changing environment
The Arctic is especially vulnerable to the increased air temperature caused by emissions of greenhouse gases to the atmosphere, carbon dioxide being one of them. In this thesis, both fieldwork and modelling of the East Siberian Arctic Shelf (the Laptev Sea and the East Siberian Sea) have been carrie...
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ftunivgoeteborg:oai:gupea.ub.gu.se:2077/28865 2023-10-29T02:32:52+01:00 Fluxes and transformation of carbon in the Siberian shelf seas under changing environment Wåhlström, Iréne 2012-05-16 application/pdf http://hdl.handle.net/2077/28865 eng eng Paper I: Wåhlström, I., Omstedt, A., Björk, G., Anderson, L.G., Modelling the CO2 dynamics in the Laptev Sea, Arctic Ocean: Part I , J. Mar. Syst., accepted 2012. Paper II: Wåhlström, I., Omstedt, A., Björk, G., Anderson, L.G., Modelling the CO2 dynamics in the Laptev Sea, Arctic Ocean: Part II Sensitivity of fluxes to changes in the forcing, J. Mar. Syst., submitted, April 2012. Paper III: Anderson, L.G., Jutterström, S., Hjalmarsson, S., Wåhlström, I., and Semiletov, I.P., Out-gassing of CO2 from Siberian Shelf Seas by terrestrial organic matter decomposition, Geophys. Res. Lett., 36, L20601, 2009. ::doi:: 10.1029/2009GL040046 Paper IV: Anderson, L.G., Björk, G., Jutterström, S., Pipko, I., Shakhova, N., Semiletov, I.P., and Wåhlström, I., East Siberian Sea, an Arctic region of very high biogeochemical activity, Biogeosciences, 8, 1745–1754, 2011. ::doi:: 10.5194/bg-8-1745-2011 Paper V: Pipko, I.I., Semiletov, I.P., Pugach, S.P., Wåhlström, I., and Anderson, L.G., Interannual variability of air-sea CO2 fluxes and carbonate system parameters in the East Siberian Sea, Biogeosciences, 8, 1987-2007, 2011. ::doi:: 10.5194/bg-8-1987-2011 978-91-628-8473-4 http://hdl.handle.net/2077/28865 Carbon system Carbon dioxide Arctic Ocean Siberian shelf seas Climate change Text Doctoral thesis Doctor of Philosophy 2012 ftunivgoeteborg 2023-10-04T21:18:23Z The Arctic is especially vulnerable to the increased air temperature caused by emissions of greenhouse gases to the atmosphere, carbon dioxide being one of them. In this thesis, both fieldwork and modelling of the East Siberian Arctic Shelf (the Laptev Sea and the East Siberian Sea) have been carried out to investigate the carbon system in this region. Fieldwork in 2008 revealed two distinct hydrological regimes in the East Siberian Sea, one in the western area and one in the eastern area. The western area is dominated by freshwater from rivers flowing into the East Siberian Sea but also from the Lena River plume coming from the Laptev Sea. Nearly all waters in this area are supersaturated with respect to carbon dioxide compared to the atmosphere due to mineralization of substantial amounts of terrestrial organic matter coming from thawing permafrost and coastal erosion. This excess carbon dioxide may be a potential source to the atmosphere and thus increase the atmospheric greenhouse gas content, a positive feedback mechanism. The eastern area is dominated by inflow of Pacific-derived waters that are clear, salty and nutrient rich and therefore favour primary productivity. Phytoplankton consumes carbon dioxide that lowers its partial pressure (pCO2) making it undersaturated compared to the atmosphere and the Eastern East Siberian Sea becomes a sink for atmospheric carbon dioxide. In addition, the Laptev Sea had supersaturated pCO2 equal to an excess of dissolved inorganic carbon of around ~5 1012 gC, which is in the same order as for the Western East Siberian Sea. This excess is also a potential source of carbon dioxide to the atmosphere that could enhance climate change. Modelling work with a one-dimensional, time dependent coupled physical biogeochemical model confirms this conclusion for the late summer when the pCO2 in the seawater increases due to mineralization and water mixing. Model simulations for the Laptev Sea were utilized to investigate the net annual sea-air flux caused by different forcings; ... Doctoral or Postdoctoral Thesis Arctic Arctic Arctic Ocean Climate change East Siberian Sea laptev Laptev Sea lena river permafrost Phytoplankton University of Gothenburg: GUPEA (Gothenburg University Publications Electronic Archive) |
institution |
Open Polar |
collection |
University of Gothenburg: GUPEA (Gothenburg University Publications Electronic Archive) |
op_collection_id |
ftunivgoeteborg |
language |
English |
topic |
Carbon system Carbon dioxide Arctic Ocean Siberian shelf seas Climate change |
spellingShingle |
Carbon system Carbon dioxide Arctic Ocean Siberian shelf seas Climate change Wåhlström, Iréne Fluxes and transformation of carbon in the Siberian shelf seas under changing environment |
topic_facet |
Carbon system Carbon dioxide Arctic Ocean Siberian shelf seas Climate change |
description |
The Arctic is especially vulnerable to the increased air temperature caused by emissions of greenhouse gases to the atmosphere, carbon dioxide being one of them. In this thesis, both fieldwork and modelling of the East Siberian Arctic Shelf (the Laptev Sea and the East Siberian Sea) have been carried out to investigate the carbon system in this region. Fieldwork in 2008 revealed two distinct hydrological regimes in the East Siberian Sea, one in the western area and one in the eastern area. The western area is dominated by freshwater from rivers flowing into the East Siberian Sea but also from the Lena River plume coming from the Laptev Sea. Nearly all waters in this area are supersaturated with respect to carbon dioxide compared to the atmosphere due to mineralization of substantial amounts of terrestrial organic matter coming from thawing permafrost and coastal erosion. This excess carbon dioxide may be a potential source to the atmosphere and thus increase the atmospheric greenhouse gas content, a positive feedback mechanism. The eastern area is dominated by inflow of Pacific-derived waters that are clear, salty and nutrient rich and therefore favour primary productivity. Phytoplankton consumes carbon dioxide that lowers its partial pressure (pCO2) making it undersaturated compared to the atmosphere and the Eastern East Siberian Sea becomes a sink for atmospheric carbon dioxide. In addition, the Laptev Sea had supersaturated pCO2 equal to an excess of dissolved inorganic carbon of around ~5 1012 gC, which is in the same order as for the Western East Siberian Sea. This excess is also a potential source of carbon dioxide to the atmosphere that could enhance climate change. Modelling work with a one-dimensional, time dependent coupled physical biogeochemical model confirms this conclusion for the late summer when the pCO2 in the seawater increases due to mineralization and water mixing. Model simulations for the Laptev Sea were utilized to investigate the net annual sea-air flux caused by different forcings; ... |
format |
Doctoral or Postdoctoral Thesis |
author |
Wåhlström, Iréne |
author_facet |
Wåhlström, Iréne |
author_sort |
Wåhlström, Iréne |
title |
Fluxes and transformation of carbon in the Siberian shelf seas under changing environment |
title_short |
Fluxes and transformation of carbon in the Siberian shelf seas under changing environment |
title_full |
Fluxes and transformation of carbon in the Siberian shelf seas under changing environment |
title_fullStr |
Fluxes and transformation of carbon in the Siberian shelf seas under changing environment |
title_full_unstemmed |
Fluxes and transformation of carbon in the Siberian shelf seas under changing environment |
title_sort |
fluxes and transformation of carbon in the siberian shelf seas under changing environment |
publishDate |
2012 |
url |
http://hdl.handle.net/2077/28865 |
genre |
Arctic Arctic Arctic Ocean Climate change East Siberian Sea laptev Laptev Sea lena river permafrost Phytoplankton |
genre_facet |
Arctic Arctic Arctic Ocean Climate change East Siberian Sea laptev Laptev Sea lena river permafrost Phytoplankton |
op_relation |
Paper I: Wåhlström, I., Omstedt, A., Björk, G., Anderson, L.G., Modelling the CO2 dynamics in the Laptev Sea, Arctic Ocean: Part I , J. Mar. Syst., accepted 2012. Paper II: Wåhlström, I., Omstedt, A., Björk, G., Anderson, L.G., Modelling the CO2 dynamics in the Laptev Sea, Arctic Ocean: Part II Sensitivity of fluxes to changes in the forcing, J. Mar. Syst., submitted, April 2012. Paper III: Anderson, L.G., Jutterström, S., Hjalmarsson, S., Wåhlström, I., and Semiletov, I.P., Out-gassing of CO2 from Siberian Shelf Seas by terrestrial organic matter decomposition, Geophys. Res. Lett., 36, L20601, 2009. ::doi:: 10.1029/2009GL040046 Paper IV: Anderson, L.G., Björk, G., Jutterström, S., Pipko, I., Shakhova, N., Semiletov, I.P., and Wåhlström, I., East Siberian Sea, an Arctic region of very high biogeochemical activity, Biogeosciences, 8, 1745–1754, 2011. ::doi:: 10.5194/bg-8-1745-2011 Paper V: Pipko, I.I., Semiletov, I.P., Pugach, S.P., Wåhlström, I., and Anderson, L.G., Interannual variability of air-sea CO2 fluxes and carbonate system parameters in the East Siberian Sea, Biogeosciences, 8, 1987-2007, 2011. ::doi:: 10.5194/bg-8-1987-2011 978-91-628-8473-4 http://hdl.handle.net/2077/28865 |
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1781054800358539264 |