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sulfur(27)
carbon(13)
aerosols(12)
oxygen(10)
sediments(9)
emissions(8)
lakes(7)
surface water(7)
iron(6)
isotopes(5)
methane(5)
precipitation(5)
geochemistry(4)
biomass(3)
degradation(3)
ions(3)
optical depth(3)
organic carbon(3)
salinity(3)
x-ray(3)
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