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freezing/thawing index
permafrost
southern boundary of permafrost
spatial–temporal distribution
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Environmental sciences
GE1-350
Meteorology. Climatology
QC851-999
Renewable energy sources
TD194-195
TJ807-830
abnormal meiyu
envir
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meridional circulation in middle and high latitudes
north atlantic triple index
sea surface temperature anomalies
water vapor transport