I don’t pretend to be exhaustive since, like Bull, ice geology is not my .These are mostly theological and logical in nature.
It is the Greenland Ice Sheet that exhibits annual cycles of one or more of the variables down an ice core.
Wieland at first seems to be somewhat aware of that as he continues: In fact, ice cores in Greenland are used for dating, based on the belief that layers containing varying isotope ratios were laid down, somewhat like the rings of a tree, over many tens of thousands of years.
The seekers of the buried aircraft never extracted intact ice core samples and subjected them to the tests used in scientific dating, and ice cores from moving glaciers aren`t used for studying anything but glacial movement.
Some scientists believe that if the ice somehow disappeared, it probably would not return in the present climate. Many ice cores have been drilled deep into both the Antarctica and Greenland ice sheets since the 1960s (see figures 12.1 and 12.2).
It is observed today that these ice sheets incorporate dust, acids, pollution, etc. Near the top of the ice sheets, annual layers can be distinguished by measuring the many variables related to the seasons.