Dissolved gallium in the Beaufort Sea of the Western Arctic Ocean: A GEOTRACES cruise in the International Polar Year

摘要: Abstract Dissolved gallium (Ga) concentrations are presented from the Beaufort Sea, representing first reported values of Ga in Arctic Ocean. Profiles dissolved this region reflect Pacific and Atlantic Oceans source waters. 4–6 pmol kg− 1 at depths  ~ 350 m 25–28 pmol kg− 1 indicative A smooth gradient increasing is observed through thermocline, consistent with mixing cool waters low concentration relatively warm higher concentration. shown here to represent a complimentary tracer inputs Western Ocean, as seasonal processes influencing temperature Nitrate:Phosphate Water entering not apparent profiles. Observed phosphate deficiency within nitrate deplete upper ~ 70 m interpreted result nitrogen fixation stored anticyclonic Gyre. Conservative behavior supports interpretation that rates calculated work associated waters, opposed freshwater sources Mackenzie River or sea ice melt. Storage deficient Gyre followed by release transport North would pulses Arctic, impacting Sampling one shelf station revealed local impacts on concentrations, including high shallow depths, fresh melt, while restricted increase thermocline suggested increased scavenging environments due particle abundance. Finally, reports allow comparison profiles Al. Distinct these two similar elements Ocean differential vertical Al sourced deep basin