But beneath a certain depth, ice layers become too thin for reliable measurement, and the remainder of the climate record must be estimated through computer modeling or by correlating the ice readings with climatic records in ocean sediments.
42.
The two terms are related due to the process of ice crystals being blown into a polynya which can be the initiation of the grease ice layer, given a minimum level of mixing and cooling of the ocean surface.
43.
Lonnie G . Thompson of Ohio State University said measurements using ice corings and modern navigation satellites show that the oldest ice layers on the famed mountain were deposited during an extremely wet period starting about 11, 700 years ago.
44.
If the ice layer resulted from cooling from a single direction ( e . g ., the top ) the rock fracture tends to lie close to the surface ( e . g ., 1 2 cm in chalk ).
45.
The Peary caribou population has dropped from above 40, 000 in 1961 to about 700 in 2009 . During this period, the number of days with above freezing temperatures has increased significantly, resulting in ice layers in the snow pack.
46.
If the ice layer resulted from a cooling from a single direction ( e . g ., the top ) the rock fracture tends to lie close to the surface ( e . g ., 1 2 cm in chalk ).
47.
In 1939, the workers of the Russky Island station made the measuring of the ice layer and the height of embacles on the perpendicular to the bank section as a present to the 18th Congress of the Communist Party of the Soviet Union.
48.
The Galileo spacecraft will make nine more close encounters with Europa over the next 2 1 / 2 years, and will photograph areas selected to reveal details that may answer questions about the extent, depth and activity of the ocean and its ice layer.
49.
That timeline, generated by stitching together hints of past temperatures embedded in tree rings, corals, ice layers, and other sources, is one strut supporting the widely accepted view that the current warm spell is being caused mainly by accumulating heat-trapping smokestack and tailpipe emissions.
50.
That timeline, generated by stitching together hints of past temperatures embedded in tree rings, corals, ice layers and other sources, is one strut supporting the widely accepted view that the current warm spell is being caused mainly by accumulating heat-trapping smokestack and tailpipe emissions.
