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AGE
8
DRILL
Drilling/drill rig
8
Sampling/drilling ice
8
ice/snow
maximum/old
minimum/young
8
Depth
7
GISP
7
GRIP/GISP/NGRIP
7
Greenland Ice Core Projects
7
bottom/max
7
top/min
7
Ammonium
4
Calcium
4
Chloride
4
Magnesium
4
Nitrate
4
Potassium
4
Sodium ion
4
Sulfate
4
GISP2
3
GISP2-B
2
GISP2-D
2
Accelerator mass spectrometry (AMS)
1
Antarctica
1
Beryllium-10
1
Calcium nitrate
1
Calcium sulfate
1
Calculated
1
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