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Impact of biogeochemical processes and environmental factors on the calcium carbonate saturation state in the Circumpolar Flaw Lead in the Amundsen Gulf, Arctic Ocean
journal contribution
posted on 2023-05-17, 10:30 authored by Chierici, M, Fransson, A, Lansard, B, Miller, LA, Mucci, A, Elizabeth ShadwickElizabeth Shadwick, Thomas, H, Tremblay, J, Papakyriakou, TNWe 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.
History
Publication title
Journal of Geophysical Research-Space PhysicsVolume
116Issue
C9Article number
C00G09Number
C00G09Pagination
1-12ISSN
2156-2202Department/School
Institute for Marine and Antarctic StudiesPublisher
Amer Geophysical UnionPlace of publication
2000 Florida Ave Nw, Washington, USA, Dc, 20009Rights statement
Copyright 2011 American Geophysical Union.Repository Status
- Restricted