By Igor A. Zotikov
The 1st e-book at the topic, this monograph examines the phenomenon of a major sealed, freshwater lake, remoted from the remainder of the realm by way of kilometers' thick ice. The lifestyles of melting ice on the backside of the massive Vostok Lake has served as a version and encouraged the group making plans the Galileo house craft to collect info at the ice sheet of the Jupiterian moon Europa. The ebook presents interpretation of, and calculations for, stimulating components for attainable melting and an incredible lake's life on the backside of the Martian ice sheets.
Read Online or Download The Antarctic Subglacial Lake Vostok: Glaciology, Biology and Planetology (Springer Praxis Books / Geophysical Sciences) PDF
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Additional resources for The Antarctic Subglacial Lake Vostok: Glaciology, Biology and Planetology (Springer Praxis Books / Geophysical Sciences)
3 m) from the surface. The glycol column down-hole had risen from 5,743 ft (1,914 m) to 5,557 ft (1,852 m) F F F Some 30 years after this dramatic event, I was drilling a hole in 1977 through 416 m of the Ross Ice Shelf. I encountered a water level, just a few meters before the subglacial ocean water, and experienced events comparable with the drilling at Byrd Station (Zotikov, 1979), indicating that subglacial water had been reached and that the rising liquid level meant that the water would soon encounter the upper, cooler parts of the hole and freeze.
Robin's discovery of a large subglacial lake near Vostok Station, represented a clear, simple, and important message. A subglacial lake, one to two orders of magnitude larger than the thickness of the ice sheet above it, has to be transparent and exhibit a surface expression of its existence. Conditions of an ice sheet moving along the rough slope of a rocky glacier bed and those ¯oating on the water of a sub-ice lake are vastly dierent. This dierence is revealed at the surface, if the size of the lake is large enough compared with the thickness of the ice sheet above it.
Radio-echo sounding showing a subglacial lake (G. de Q. Robin, 1993, pers. ). Studies on these peculiarities of bottom re¯ections were continued in the 1974/ 1975 ®eld season. Analyses of 17 other cases of this kind in East Antarctica showed that all were located in areas with evidence of an ice bed composed of solid rock, where the rate of glacier movement was low (meaning that transport of erosional debris was also low), and the surface above those areas was also nearly horizontal. Dr. 2). Unfortunately, the thickness, or depth, of the lakes was unknown because radio signals do not propagate in water.