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seasonal variation(9)
winter(9)
carbon(8)
nitrogen deposition(8)
nitrogen oxides(8)
permafrost(8)
pollution control(8)
secondary organic aerosol(8)
sulfur compounds(8)
air temperature(7)
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climate models(7)
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organic carbon(7)
pleistocene(7)
sulfur dioxide(7)
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waste activated sludge(7)
ambient air(6)
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