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oxygen(239)
isotopes(38)
carbon(37)
salinity(35)
nitrogen(29)
oxygen isotopes(28)
surface water(23)
lakes(21)
sediments(19)
oceans(17)
chlorophyll(16)
carbon dioxide(15)
biomass(13)
density(13)
organic matter(13)
precipitation(13)
atmosphere(12)
nitrate(12)
organic carbon(11)
paleoclimate(11)
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