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Ammonium
1
Calcium
1
Chloride
1
Chromatography
1
Comment
Depth, bottom/max
1
Depth, top/min
Fluoride
1
Ice core
1
Ice drill
1
Ion concentrations
1
Laboratory
1
Lithium
1
Magnesium
1
Methanesulfonic acid
1
NGRIP
1
Nitrate
1
North Greenland Ice Core Project NGRIP
1
NorthGRIP ice core
1
Potassium
1
Sodium
1
Sulfate
1
impurities
1
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