The distribution and chemical speciation of dissolved and particulate phosphorus in the Bering Sea and the Chukchi–Beaufort Seas

Relevance of dissolved organic nutrients for the Arctic Ocean nutrient budget

“…Our average Nordic Seas DOP concentration (0.17 ± 0.11 μmol L −1 ) is higher than, but consistent with, the NAtl average (∼0.12 ± 0.02 μmol L −1 ) [Karl and Björkman, 2015]. DOP within the AO (and environs) range from low/undetectable to ∼2.6 μmol L −1 [Simpson et al, 2008;Lin et al, 2012;Tremblay et al, 2014]. Some of the highest concentrations have been observed in the Bering Sea (up to 0.45 μmol L −1 ) and Chukchi Sea (up to 0.41 μmol L −1 ) [Lin et al, 2012], Kugmallit Bay (Canadian Beaufort Shelf; up to 1.33 μmol L −1 ) [Tremblay et al, 2014], and associated with Pacific-derived waters at 150-200 m (0.76 ± 0.27 μmol L −1 , southeastern Beaufort Sea) [Simpson et al, 2008].…”

“…DOP within the AO (and environs) range from low/undetectable to ∼2.6 μmol L −1 [Simpson et al, 2008;Lin et al, 2012;Tremblay et al, 2014]. Some of the highest concentrations have been observed in the Bering Sea (up to 0.45 μmol L −1 ) and Chukchi Sea (up to 0.41 μmol L −1 ) [Lin et al, 2012], Kugmallit Bay (Canadian Beaufort Shelf; up to 1.33 μmol L −1 ) [Tremblay et al, 2014], and associated with Pacific-derived waters at 150-200 m (0.76 ± 0.27 μmol L −1 , southeastern Beaufort Sea) [Simpson et al, 2008]. Hence, our observations across the LC (0.85 ± 0.18 μmol L −1 , upper 100 m) are among the highest recorded in the Arctic-Subarctic environment.…”

Dynamic changes in the abundance and chemical speciation of dissolved and particulate phosphorus across the river-lake interface in southwest Lake Michigan

“…For the measurement of TDP concentrations, the filtrate samples were digested with acid persulfate solution in an oven at 95°C for 24 h (Huang and Zhang ; Lin et al ), followed by analysis using the standard phosphomolybdenum blue method with a UV‐vis spectrophotometer (Agilent 8453) in 5 cm cuvettes at 882 nm (Hansen and Koroleff ). DIP concentrations were directly measured without digestion.…”

Dynamics of Dissolved Organic Phosphorus

“…The technique of cross-flow filtration (CFF) has been used to isolate and concentrate colloidal marine materials (e.g., Buesseler et al, 1996;Cai and Guo 2009;Lin et al, 2012;Whitehouse et al, 1990) for subsequent analysis. In the absence of selective adsorption or contamination, TP should behave conservatively in CFF systems.…”