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Ammonium
10
Calcium
10
GISP
Magnesium
10
Nitrate
10
Potassium
10
Sampling/drilling ice
10
Sulfate
10
AGE
8
Chloride
8
Drilling/drill rig
8
Sodium ion
8
GRIP/GISP/NGRIP
5
Greenland Ice Core Projects
5
Greenland Ice Core Projects GRIP/GISP/NGRIP
5
Age, maximum/old
4
Age, minimum/young
4
DEPTH, ice/snow
4
DRILL
4
Depth
4
Depth, bottom/max
4
Depth, top/min
4
bottom/max
4
ice/snow
4
maximum/old
4
minimum/young
4
top/min
4
ALTITUDE
2
Aerological investigations
2
DATE/TIME
2
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