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530
550
22
Alaska
Alert
22
Arctic
Barrow
22
Canada
Ellesmere Island
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Greenland
22
Ny-Alesund
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Queen Elizabeth Islands
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Spitsbergen
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Svalbard
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Svalbard and Jan Mayen
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United States
22
annual variation
22
filter
22
ground-based measurement
22
ice
22
nucleation
particulate matter
22
Nunavut
21
concentration (composition)
21
concentration composition
1
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