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nitrification(12)
denitrification(6)
nitrogen cycle(4)
nitrous oxide(3)
ammonium(2)
isotopomer(2)
nitrate isotopes(2)
sea ice(2)
southern ocean(2)
acidification(1)
ammonia oxidation(1)
antarctic(1)
antarctic zone(1)
arabian sea(1)
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atlantic ocean(1)
baltic sea(1)
biogeochemistry(1)
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