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530
3
550
3
Alaska
3
Alert
3
Arctic
Barrow
3
Canada
3
Ellesmere Island
Greenland
3
Nunavut
3
Ny-Alesund
3
Queen Elizabeth Islands
3
Spitsbergen
3
Svalbard
3
Svalbard and Jan Mayen
United States
3
annual variation
3
concentration (composition)
3
filter
3
ground-based measurement
3
ice
3
nucleation
3
particulate matter
3
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