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Changes in ice cover thickness and lake level of Lake Hoare, Antarctica - Implications for local climatic changeResults are reported from 10 years of ice-thickness measurements at perennially ice-covered Lake Hoare in southern Victoria Land, Antarctica. The ice cover of this lake had been thinning steadily at a rate exceeding 20 cm/yr during the last decade but seems to have recently stabilized at a thickness of 3.3 m. Data concerning lake level and degree-days above freezing are presented to show the relationship between peak summer temperatures and the volume of glacier-derived meltwater entering Lake Hoare each summer. From these latter data it is inferred that peak summer temperatures have been above 0 C for a progressively longer period of time each year since 1972. Possible explanations for the thinning of the lake ice are considered. The thickness of the ice cover is determined by the balance between freezing during the winter and ablation that occurs all year but maximizes in summer. It is suggested that the term most likely responsible for the change in the ice cover thickness at Lake Hoare is the extent of summer melting, consistent with the rising lake levels.
Document ID
19920045847
Document Type
Reprint (Version printed in journal)
Authors
Wharton, Robert A., Jr. (Nevada, University Reno, United States)
Mckay, Christopher P. (NASA Ames Research Center Moffett Field, CA, United States)
Clow, Gary D. (USGS Menlo Park, CA, United States)
Andersen, Dale T. (Lockheed Engineering and Sciences Co. Washington, DC, United States)
Simmons, George M., Jr. (Virginia Polytechnic Institute and State University Blacksburg, United States)
Love, F. G. (Radford University VA, United States)
Date Acquired
August 15, 2013
Publication Date
March 15, 1992
Publication Information
Publication: Journal of Geophysical Research
Volume: 97
Issue: C3, M
ISSN: 0148-0227
Subject Category
GEOPHYSICS
Distribution Limits
Public
Copyright
Other