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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
22
Greenland
Nunavut
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Ny-Alesund
22
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)
filter
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ground-based measurement
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ice
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nucleation
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particulate matter
22
530
21
550
21
ddc:530
1
ddc:550
1
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