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530
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550
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Alaska
Alert
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Arctic
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Barrow
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Canada
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Ellesmere Island
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Greenland
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Nunavut
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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
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annual variation
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concentration (composition)
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filter
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ground-based measurement
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ice
nucleation
particulate matter
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