Impact of biogeochemical processes and environmental factors on the calcium carbonate saturation state in the Circumpolar Flaw Lead in the Amundsen Gulf, Arctic Ocean

• Published in: Journal of Geophysical Research
• Main Authors: Chierici, Melissa, Fransson, Agneta, Lansard, Bruno, Miller, Lisa, Mucci, Alfonso, Shadwick, Elizabeth, Thomas, Helmuth, Tremblay, J.-É., Papakyriakou, Tim
• Other Authors: Göteborgs Universitet = University of Gothenburg (GU), Centre de recherche sur la dynamique du système Terre (GEOTOP), École Polytechnique de Montréal (EPM)-McGill University = Université McGill Montréal, Canada -Université de Montréal (UdeM)-Université du Québec en Abitibi-Témiscamingue (UQAT)-Université du Québec à Rimouski (UQAR)-Concordia University Montreal -Université du Québec à Montréal = University of Québec in Montréal (UQAM), Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Océan et Interfaces (OCEANIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), British Columbia, Department of Oceanography Halifax (DO), Dalhousie University Halifax, Université Laval Québec (ULaval), Centre for Earth Observation Science Winnipeg, University of Manitoba Winnipeg
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2011
• Subjects: [SDU.OCEAN]Sciences of the Universe [physics]/Ocean; Atmosphere; [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces; environment; Arctic; Arctic Ocean; Amundsen Gulf; Sea ice
• Online Access: https://hal.science/hal-02901377; https://hal.science/hal-02901377/document; https://hal.science/hal-02901377/file/2011JC007184.pdf; https://doi.org/10.1029/2011JC007184

International audience [1] 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, [CO 3 2À ] and W, the saturation state of these waters with respect to calcite (W Ca) and aragonite (W Ar). Vertical mixing and salinity changes had equal impacts over the annual cycle. The impact of sea ice meltwater resulted in decreasing W values in summer, but most of this change was offset by the W increase as a result of CO 2 drawdown during biological photosynthesis.