Accession Number : AD0675405

Title :   A LIMNOLOGICAL RECONNAISSANCE IN INTERIOR ALASKA.

Descriptive Note : Research rept.,

Corporate Author : DARTMOUTH COLL HANOVER N H

Personal Author(s) : Likens,Gene E. ; Johnson,Philip L.

Report Date : JUN 1968

Pagination or Media Count : 49

Abstract : 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 monomictic (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/cu m day) was measured in C14 experiments. It was inferred that nutrients were the more probable limiting factor for primary production in these lakes. (Author)

Descriptors :   (*HYDROLOGY, ALASKA), (*RIVERS, CHEMICAL PROPERTIES), LAKES, DRAINAGE, IONS, CALCIUM, MAGNESIUM, SODIUM, CARBONATES, SEDIMENTATION, LIGHT TRANSMISSION, AERIAL PHOTOGRAPHS, TERRAIN, SWAMPS, PLANKTON, SHALLOW WATER, MARINE BIOLOGY, ARCTIC REGIONS

Subject Categories : Hydrology, Limnology and Potamology

Distribution Statement : APPROVED FOR PUBLIC RELEASE