Phytoplankton and dimethylsulfide dynamics at two contrasting Arctic ice edges

Arctic sea ice is retreating and thinning and its rate of decline has steepened in the last decades. While phytoplankton blooms are known to seasonally propagate along the ice edge as it recedes from spring to summer, the substitution of thick multiyear ice (MYI) with thinner, ponded first-year ice...

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Bibliographic Details
Published in:Biogeosciences 2020-03, Vol.17 (6), p.1557-1581
Main Authors: Lizotte, Martine, Levasseur, Maurice, Galindo, Virginie, Gourdal, Margaux, Gosselin, Michel, Tremblay, Jean-Ãric, Blais, Marjolaine, Charette, Joannie, Hussherr, Rachel
Format: Article
Language:English
Subjects:
Algae
Arctic climates
Arctic ice
Arctic sea ice
Blooms
Chlorophyll
Chlorophyll a
Climate
Climate change
Dimethyl sulfide
Dimethylsulphoniopropionate
Dynamics
Ecology
Ice
Ice cover
Ice edge
Ice melting
Light
Low concentrations
Organic sulfur compounds
Outdoor air quality
Phytoplankton
Phytoplankton bloom
Plankton
Ponds
Rankings
Salinity
Sea ice
Straits
Stratification
Sulfur
Sulfur compounds
Sulphur
Summer
Surface water
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Summary:Arctic sea ice is retreating and thinning and its rate of decline has steepened in the last decades. While phytoplankton blooms are known to seasonally propagate along the ice edge as it recedes from spring to summer, the substitution of thick multiyear ice (MYI) with thinner, ponded first-year ice (FYI) represents an unequal exchange when considering the roles sea ice plays in the ecology and climate of the Arctic. Consequences of this shifting sea ice on the phenology of phytoplankton and the associated cycling of the climate-relevant gas dimethylsulfide (DMS) and its precursor dimethylsulfoniopropionate (DMSP) remain ill constrained. In July–August 2014, two contrasting ice edges in the Canadian High Arctic were explored: a FYI-dominated ice edge in Barrow Strait and a MYI-dominated ice edge in Nares Strait. Our results reveal two distinct planktonic systems and associated DMS dynamics in connection to these diverging ice types. The surface waters exiting the ponded FYI in Barrow Strait were characterized by moderate chlorophyll a (Chl a,
ISSN:1726-4189
1726-4170
1726-4189
DOI:10.5194/bg-17-1557-2020