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mercury
arctic
2
GeoQUEST
1
Life Sciences
1
Physical Sciences and Mathematics
1
Social and Behavioral Sciences
1
alaska
1
atmospheric
1
beluga
1
carbon-13
1
climate change
1
cycling
1
global change
1
human activity
1
inferred
1
nitrogen-15
1
observations
1
ocean
1
permafrost
1
pollution
1
riverine
1
source
1
stable isotopes
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