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We report on measurements across an annual cycle of carbon dioxide system parameters in the polar mixed layer (PML) of the circumpolar flaw lead in the Amundsen Gulf, Arctic Ocean. From these and other properties (nitrate, S, T) of the PML, we found that biological processes (photosynthesis and respiration) accounted for about 50% of the monthly variations in the carbonate ion concentration, [CO32−] and Ù, the saturation state of these waters with respect to calcite (ÙCa) and aragonite (ÙAr). Vertical mixing and salinity changes had equal impacts over the annual cycle. The impact of sea ice meltwater resulted in decreasing Ù values in summer, but most of this change was offset by the Ù increase as a result of CO2 drawdown during biological photosynthesis.

Item Type:	Refereed Article
Keywords:	Arctic Ocean, Carbonate Saturation State, Biogeochemistry
Research Division:	Earth Sciences
Research Group:	Oceanography
Research Field:	Chemical oceanography
Objective Division:	Environmental Management
Objective Group:	Coastal and estuarine systems and management
Objective Field:	Measurement and assessment of estuarine water quality
UTAS Author:	Shadwick, E (Dr Elizabeth Shadwick)
ID Code:	75929
Year Published:	2011
Web of Science® Times Cited:	34
Deposited By:	CRC-Antarctic Climate & Ecosystems
Deposited On:	2012-02-21
Last Modified:	2017-10-31
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