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AGE
Ammonium
9
Calcium
9
Chloride
9
Magnesium
9
Nitrate
9
Potassium
Sampling/drilling ice
9
Sodium ion
9
Drilling/drill rig
8
GISP
8
Sulfate
8
DEPTH, ice/snow
5
Greenland Ice Core Projects GRIP/GISP/NGRIP
5
Age, maximum/old
4
Age, minimum/young
4
DRILL
4
Depth
4
Depth, bottom/max
4
Depth, top/min
4
GRIP/GISP/NGRIP
4
Greenland Ice Core Projects
4
bottom/max
4
ice/snow
4
maximum/old
4
minimum/young
4
top/min
4
GISP2-B
2
Hydrogen peroxide
2
Acetate
1
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