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- Fransson, Agneta, 1964, et al.
(author)
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CO2 in ice covered seas
- 2007
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In: Oden Southern Ocean seminar series onboard IB Oden December 2006.
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Conference paper (other academic/artistic)
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| 5. |
- Fransson, Agneta, 1964, et al.
(author)
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Oceanic carbonate system in the climatically sensitive Amundsen and Ross Seas, Southern Ocean
- 2009
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In: 8th International Carbon dioxide conference, 13 to 19th of September 2009, Jena, Germany.
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Conference paper (peer-reviewed)abstract
- During three expeditions (2006, 2007/2008 and 2008/2009) in the Pacific sector of the Southern Ocean in austral summer, the IB Oden acted as research platform in the climatically sensitive oceans of the Amundsen and Ross Seas. Continuous underway measurements of fCO2 and sampling of seawater were performed to study the carbonate system parameters. Along the route, we encountered both open water and heavy pack ice, starting from South Chile, crossing Drake Passage, and continuing through the Amundsen Sea to the Ross Sea. Large variability in fCO2 was observed in different areas and between years, linked to varying sea ice conditions, biological production and physical processes. Sea-air CO2 fluxes were calculated using wind speed data together with measured fCO2 in seawater and air. Total alkalinity (AT) and pH were used together with salinity and sea surface temperature to investigate the effect of CO2 in the surface water. We calculated the carbonate ion concentration [CO32-] and the saturation of aragonite (ΩAr) and calcite (ΩCa) in the surface water and found low [CO32-] and low saturation levels with regard to aragonite (ΩAr < 1.2) at several locations.
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- Chierici, Melissa, 1968
(author)
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Towards an understanding of the biological forcing of CO2 in the Southern Polar Ocean.
- 2009
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Reports (other academic/artistic)abstract
- The aim of this project was to quantitatively investigate the mechanisms driving the oceanic carbon dioxide system and the CO2 air-sea flux in areas of different characteristics regarding water column stratification, ice cover/extent and freshwater input in the Pacific sector of the Southern Ocean. The biogeochemical transformation of carbon was evaluated from CO2 system data and information on water mass properties in the water column. Another goal was to investigate the large natural variability of the marine carbonate system in the study area, to provide basic information needed to predict the response to future changes in the CaCO3 saturation in the Southern Ocean due to changes in sea ice extent and temperature.
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| 9. |
- Fransson, Agneta, 1964, et al.
(author)
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Continuous pCO2 measurements under the sea ice in Arctic and Antarctic waters onboard an icebreaker.
- 2007
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In: IOCCP Report from Surface Ocean Surface CO2 Variability and Vulnerabilities Workshop, 11-14th April 2007, UNESCO-IOCCP, Paris, France.. ; 7
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Conference paper (other academic/artistic)abstract
- High-frequency underway pCO2 measurements were successfully performed in the Arctic Ocean in 2005, and in the Antarctic Southern Ocean in 2006 onboard the Swedish I/B Oden. We traversed in both open water and heavy sea ice conditions. The seawater intake was placed at the bow of the ship at approximately 8 meters depth, which enabled immediate under ice measurements in ice covered areas. In both studies, preliminary data showed rapid changes in the pCO2 and oxygen values in the ice zones, which was related to physical fronts and changing sea-ice conditions. However, the under-ice pCO2 levels differed in the two high-latitude oceans, likely due to different ecosystem dynamics involving ice-algae versus pelagic phytoplankton production. Future participation in expeditions to Antarctic Southern Ocean, and a long-term study in the Arctic Ocean in 2007/2008 will enable us to further investigate the biogeochemical dynamics in both Polar seas.
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