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austral summer
3
ross sea
3
southern-ocean
3
weddell sea
3
ammonium
2
antarctic ocean
2
antarctic waters
2
indian sector
2
marginal ice-zone
2
marine-phytoplankton
2
n-15 uptake
2
nitrate uptake
2
nitrogen uptake
2
primary productivity
2
productivity
2
scotia sea
2
southern ocean
2
surface waters
2
autumn
1
biomass
1
c-13/c-12
1
confluence area
1
edge zone
1
f-ratio
1
ice edge
1
indian-ocean
1
indian-ocean sector
1
inorganic nitrogen
1
isotope fractionation
1
late summer
1
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