Biogeochemical Cycling of Colloidal Trace Metals in the Arctic Cryosphere

The surface waters of the Arctic Ocean include an important inventory of freshwater from rivers, sea ice melt, and glacial meltwaters. While some freshwaters are mixed directly into the surface ocean, cryospheric reservoirs, such as snow, sea ice, and melt ponds act as incubators for trace metals, a...

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Bibliographic Details
Published in:Journal of geophysical research. Oceans 2021-08, Vol.126 (8), p.n/a
Main Authors: Jensen, Laramie T., Lanning, Nathan T., Marsay, Chris M., Buck, Clifton S., Aguilar‐Islas, Ana M., Rember, Robert, Landing, William M., Sherrell, Robert M., Fitzsimmons, Jessica N.
Format: Article
Language:English
Subjects:
Aerosol deposition
Aggregation
Arctic Ocean
Availability
Biogeochemical cycles
Biogeochemistry
Cadmium
Chemical analysis
Climate change
Colloids
Copper
Cryosphere
Disaggregation
Fresh water
Freshwater
Freshwater ice
Geophysics
GEOTRACES
Glacier melting
Heavy metals
Ice formation
Ice melting
Incubators
Inland water environment
Iron
Manganese
melt ponds
Melting
Meltwater
Metal concentrations
Metal particles
Metals
Microorganisms
Nickel
North Pole
Nutrient cycles
Nutrients
Oceans
Polar environments
Ponds
Reservoirs
River discharge
River flow
Rivers
Sea ice
sea ice and snow
Seawater
Snow
Speciation
Stations
Surface water
Trace metals
Zinc
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Summary:The surface waters of the Arctic Ocean include an important inventory of freshwater from rivers, sea ice melt, and glacial meltwaters. While some freshwaters are mixed directly into the surface ocean, cryospheric reservoirs, such as snow, sea ice, and melt ponds act as incubators for trace metals, as well as potential sources to the surface ocean upon melting. The availability and reactivity of these metals depends on their speciation, which may vary across each pool or undergo transformation upon mixing. We present here baseline measurements of colloidal (∼0.003–0.200 μm) iron (Fe), zinc (Zn), nickel (Ni), copper (Cu), cadmium (Cd), and manganese (Mn) in snow, sea ice, melt ponds, and the underlying seawater. We consider both the total concentration of colloidal metals ([cMe]) in each cryospheric reservoir and the contribution of cMe to the overall dissolved metal phase (%cMe). Notably, snow contained higher (cMe) as well as higher %cMe relative to seawater for metals such as Fe and Zn across most stations. Stations close to the North Pole had relatively high aerosol deposition, imparting high (cFe) and (cZn), as well as high %cFe, %cZn, %cMn, and %cCd (>80%). In contrast, surface seawater concentrations of Cd, Cu, Mn, and Ni were dominated by the soluble phase (
ISSN:2169-9275
2169-9291
DOI:10.1029/2021JC017394