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climatic changes
2
Antarctica
1
Dronning Maud Land
1
El Nino
1
Ice core
1
Solar activity
1
Stable isotope
1
core analysis
1
microorganisms
1
nitrate records
1
nitrogen species
1
organic carbon
1
oxygen isotope
1
oxygen isotopes
1
palaeoclimate
1
snow
1
southern oscillation
1
spatial variations
1
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