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Title: Characterization of year-round sensitivity of California's Montane Lakes to acidic deposition. Final report, October 1986-June 1989

Four high-elevation, lake watersheds in the Sierra Nevada were studied from October 1986 through June 1988. Researchers measured wet deposition, lake outflow and lake chemistry and physics at these sites using the mass-balance approach to relate the effect of wet deposition on lake and stream water chemistry. Crystal and Ruby Lakes, located on the eastern slope of the Sierra, and Topaz and Pear Lakes, located on the western slope in Sequoia National Park, were found to be dimictic. Major solute concentrations in the subsurface reached a minima during the latter part of snowmelt. Near-bottom concentrations of these solutes generally had less seasonal variation and were generally higher than subsurface values. Mean snow depth and chemical concentrations were similar for the winters of 1986-87 and 1987-88 at all watersheds. Volume-weighted mean pH ranged from 5.3 to 5.5, with the dominant ion being hydrogen, ammonium, acetate, nitrate and sulfate. Wet deposition as mixed rain and snow occurring between May and October can deliver more solutes to the watersheds than winter snows.
Authors:
;
Publication Date:
OSTI Identifier:
5518903
Report Number(s):
PB-89-215552/XAB
Resource Type:
Technical Report
Research Org:
California Univ., Santa Barbara, CA (USA). Dept. of Biological Sciences
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; ACID RAIN; DEPOSITION; CALIFORNIA; LAKES; WATERSHEDS; ACIDIFICATION; CHEMICAL ANALYSIS; HYDROLOGY; LIMNOLOGY; PROGRESS REPORT; WATER POLLUTION; ATMOSPHERIC PRECIPITATIONS; DOCUMENT TYPES; FEDERAL REGION IX; NORTH AMERICA; POLLUTION; RAIN; SURFACE WATERS; USA 520200* -- Environment, Aquatic-- Chemicals Monitoring & Transport-- (-1989); 500200 -- Environment, Atmospheric-- Chemicals Monitoring & Transport-- (-1989)