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530
20
550
Alaska
20
Alert
20
Arctic
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Canada
20
Ellesmere Island
20
Greenland
20
Nunavut
20
Ny-Alesund
20
Queen Elizabeth Islands
20
Spitsbergen
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Svalbard
20
Svalbard and Jan Mayen
20
United States
20
annual variation
20
concentration (composition)
20
filter
20
ground-based measurement
20
ice
20
nucleation
20
particulate matter
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