Call number:
ZSP-202-239
In:
Research report
Description / Table of Contents:
CONTENTS: Preface. - Abstract. - Introduction. - Climate. - Geology. - Methods and procedures. - General description of lakes studied. - Circulation and mixing in lakes. - Heat flow. - Light transmission. - Measurements of primary productivity. - Chemical characteristics. - Summary. - Literature cited. - Appendix A: Limnological measurements.
Description / Table of Contents:
Chemical, physical and biological measurements were made in about 40 lakes and 9 other aquatic habitats in interior Alaska, primarily in the Tanana and Yukon River drainages. The lakes were classified according to circulation patterns, inferred from temperature and chemical profiles, into mononictic (22 to 24 lakes), dimictic (13 to 15 lakes) and meromictic (3 lakes) types. The lake waters were generally very alkaline in both the Yukon and Tanana drainages. Calcium, magnesium, sodium and bicarbonate ions dominated the water chemistry. In several lakes concentrations of sulfate and magnesium exceeded the limits suggested for potable water. The chemistry of surface water from various springs and the Arctic Coastal Plain was contrasted with that of lakes in interior Alaska. Sediment temperatures demonstrated a significant feature of unfrozen lakes in cold regions: a considerable net amount of heat flows from the water to the underlying sediments annually. Light penetration into the lakes varied widely (extinction coefficients of 0.46/m to 3.57/m). A relatively high rate of carbon fixation (764 mg C/m^3 day) was measured in C^14 experiments. It was inferred that nutrients were the more probable limiting factor for primary production in these lakes.
Type of Medium:
Series available for loan
Pages:
V, 41 S. : Ill.
Series Statement:
Research report / Cold Regions Research and Engineering Laboratory, CRREL, US Army Material Command 239
URL:
http://acwc.sdp.sirsi.net/client/en_US/search/asset/1013445
Branch Library:
AWI Library
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