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Science Keywords>PALEOCLIMATE>OCEAN/LAKE RECORDS

Terrain and Vegetation of Imnavait Creek, AK: Permanent Plots

Entry ID: ARCSS110

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Summary

Abstract: LTER - Long-Term Ecological Research Program/North Temperate Lakes (NTL)

LTER/NTL012 [Summary adapted from the LTER Core Data Set Catalog]:

A network of 11 monitoring wells is used to characterize regional
groundwater chemistry in the Trout Lake area. A concentrated network
of 30 wells along a groundwater flow path between two of the lakes
permitted a better resolution of groundwater flow ... paths, velocities,
and chemistry than is found in most studies. Chemical parameters
measured include dissolved oxygen, pH, total alkalinity, calcium,
magnesium, sodium, potassium, chloride, sulphate, iron, and dissolved
reactive silica. An associated data set (Groundwater Flow in the Area
Surrounding the North Temperate Lakes Primary Study Lakes, NTL011)
contains monthly well water level measurements. Chemical data are
available at a quarterly sampling frequency for some years. Analysis
of the major chemical elements shows that some groundwater exhibits
substantial seasonal variance. Chemical data are incorporated into a
computerized chemical reaction model (PHREEQE) to evaluate minerals
that control water composition, and critical solid/liquid reactions
that occur along flow paths. Groundwater discharge into lakes can
have a significant effect on lake chemistry.

Special Comments: Digitization of data is in progress. These data
are tied with data set NTL011 on well water levels.

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
protected.

Information about LTER is also available at
http://lternet.edu/