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antarctic waters
n-15 uptake
2
ammonium
1
austral summer
1
confluence area
1
ice edge
1
indian-ocean sector
1
inorganic nitrogen
1
marine-bacteria
1
marine-phytoplankton
1
nitrate uptake
1
nutrient
1
phytoplankton
1
productivity
1
ross sea
1
southern-ocean
1
surface waters
1
weddell sea
1
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