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Ammonium
Calcium
12
Magnesium
12
Nitrate
12
Potassium
12
Sampling/drilling ice
11
Sulfate
11
Chloride
10
GISP
10
AGE
9
Drilling/drill rig
8
Sodium ion
8
GRIP/GISP/NGRIP
6
Greenland Ice Core Projects
6
Depth
5
Greenland Ice Core Projects GRIP/GISP/NGRIP
5
bottom/max
5
ice/snow
5
top/min
5
Age, maximum/old
4
Age, minimum/young
4
DEPTH, ice/snow
4
DRILL
4
Depth, bottom/max
4
Depth, top/min
4
maximum/old
4
minimum/young
4
Methane sulfonic acid
3
Sodium
3
ALTITUDE
2
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