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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Conclusions

	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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