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530
1
550
1
Alaska
Alert
1
Arctic
1
Barrow
1
Canada
1
Ellesmere Island
1
Greenland
1
Ny-Alesund
1
Queen Elizabeth Islands
1
Spitsbergen
1
Svalbard
1
Svalbard and Jan Mayen
1
United States
1
annual variation
1
concentration composition
1
filter
1
ground-based measurement
ice
1
nucleation
1
particulate matter
1
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