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