Long-Term Ecological Research (LTER)/NTL015: Ice Duration in North Temperate Lake Primary Study LakesEntry ID: LTER_NTL015
Abstract: LTER - Long-Term Ecological Research Program/North Temperate Lakes (NTL)
LTER/NTL015 [Summary adapted from the LTER Core Data Set Catalog]:
Data include day of freeze-up and thaw of seven primary lakes
(Allequash, Big Muskellunge, Crystal, Sparkling, and Trout lakes, and
unnamed lakes 27-02, and 12-15). Observations are made daily during
times of freeze and thaw.
The North Temperate Lakes ... (NTL) site is affiliated with the Center for
Limnology at the University of Wisconsin, Madison. The NTL site
focuses its research on north temperate lake ecosystems in the
Northern Highland Lakes District of Wisconsin. The Northern Highland
Lakes District, has an area of approximately 10,000 sq. km. and has
one of the highest concentrations of lakes in the world. Lakes range
in size from 0.1 to 1,500 ha, in depth from 1 to 33 m, and in
fertility from oligotrophic to eutrophic. Other representative
limnological conditions include: rainwater dominated, groundwater
dominated and drainage lakes; dystrophic lakes; lakes with varved
sediments, winterkill lakes, temporary and permanent forest ponds, and
reservoirs. Lakes are influenced by strong seasonality and are usually
ice covered from late November to late April. Lakes within the
Northern Highland exhibit near-natural water quality conditions.
Nearly 80% of the land area and two-thirds of the lake frontage are
Information about LTER is also available at
Start Date: 1981-09-01
ATMOSPHERE > ATMOSPHERIC PHENOMENA > FREEZE
CRYOSPHERE > SNOW/ICE > FREEZE/THAW
CRYOSPHERE > SNOW/ICE > ICE GROWTH/MELT
CRYOSPHERE > SNOW/ICE > LAKE ICE
TERRESTRIAL HYDROSPHERE > SNOW/ICE > FREEZE/THAW
TERRESTRIAL HYDROSPHERE > SNOW/ICE > ICE GROWTH/MELT
TERRESTRIAL HYDROSPHERE > SNOW/ICE > LAKE ICE
Role: TECHNICAL CONTACT
Phone: (715) 356-9494
Fax: (715) 356-6866
Email: tkkratz at facstaff.wisc.edu
Email: tkratz at LTERnet.edu
University of Wisconsin Trout Lake Station 10810 County Highway N
City: Boulder Junction
Province or State: WI
Postal Code: 54512
Role: DIF AUTHOR
Email: gsfc-gcmduso at mail.nasa.gov
Kratz, T. K.; Magnuson, J. J.; Bowser, C. B. (sic); Frost, T. M. 1986.
"Rationale for data collection and interpretation in the Northern
Lakes Long-Term Ecological Research Program", In B. G. Isom, ed.
Rationale for Sampling and Interpretation of Ecological Data in the
Assessment of Freshwater Systems: a Symposium Sponsored by ASTM
Committee D-19 on Water, American Society for Testing and Materials,
Philadelphia, PA October 31 - November 1, pp. 22-33.
Magnuson, J. J.; Kratz, T. K. 1982. "Northern lakes LTER site", In J.
C. Halfpenny, ed. Long-Term Ecological Research in the United States:
A Network of Research Sites 1982, LTER Program Steering Committee, pp.
Magnuson, J. J.; Bowser, C. J.; Kratz, T. K. 1984. "Long-term
ecological research on north temperate lakes (LTER)", Verh. Internat.
Verein. Limnol., Vol. 22, pp. 533-535.
See also: http://limnosun.limnology.wisc.edu/cgi-bin/bibliography.cgi
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Creation and Review Dates
Last DIF Revision Date: 2004-02-09