Spatial, Seasonal, and Interannual Variations in Nutrients in the Southern Ocean GLOBEC Region: Water Circulation and Nutrient Cycling
Kent A. Fanning and Yulia Serebrennikova
As ably assisted by
Rob Masserini, Steve Bell, Howard Rutherford
Rebecca Conroy

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Upper ocean spatial variations were strongest for composite nutrient profiles; deeper waters were relatively invariant
Offshore-onshore variations in mixed layer nutrients were pronounced, especially for ammonia, with Marguerite Bay providing a significant endmember.
Nearshore mixed-layer ammonia maxima were co-located with a coastal current, at least in year 1 of GLOBEC
Mixed-layer nitrate, phosphate, and silica concentrations appeared in steady-state, while ammonia concentrations and standing stocks showed strong, erratic seasonal and year-to-year declines.
An inverse -3 mol:mol relationship between nitrate and ammonia existed throughout all GLOBEC cruises and for an autumn JGOFS Ross Sea cruise.
Silica was an excellent tracer of upwelling and horizontal injection of offshore waters onto the West Antarctic Shelf

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