Oceanic carbonate system in the climatically sensitive Amundsen and Ross Seas, Southern Ocean,

• 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.

Ämnesord

NATURVETENSKAP  -- Geovetenskap och miljövetenskap -- Oceanografi, hydrologi och vattenresurser (hsv//swe)

NATURAL SCIENCES  -- Earth and Related Environmental Sciences -- Oceanography, Hydrology and Water Resources (hsv//eng)

NATURVETENSKAP  -- Geovetenskap och miljövetenskap -- Klimatforskning (hsv//swe)

NATURAL SCIENCES  -- Earth and Related Environmental Sciences -- Climate Research (hsv//eng)

NATURVETENSKAP  -- Kemi -- Annan kemi (hsv//swe)

NATURAL SCIENCES  -- Chemical Sciences -- Other Chemistry Topics (hsv//eng)

NATURVETENSKAP  -- Kemi -- Analytisk kemi (hsv//swe)

NATURAL SCIENCES  -- Chemical Sciences -- Analytical Chemistry (hsv//eng)

Nyckelord

carbon cycle

gas exchange

antarctica

ice covered seas

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