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Variations in northern Sierra Nevada streamflow. Implications of climate change

Water Resources Bulletin

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DOI: 10.1111/j.1752-1688.1993.tb03208.x

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Abstract

Historical records of streamflow for an eastward- and a westward-draining stream in the northern Sierra Nevada have been analyzed for evidence of changes in runoff characteristics and patterns of variability. A trend of increasing and more variable winter streamflow began in the mid-1960s. Mean monthly streamflow during December through March was substantially greater for water years 1965-1990 compared to water years 1939-1964. Increased winter and early-spring streamflow during the later period is attributed to small increases in temperature, which increase the rain-to-snow ratio at lower altitudes and cause the snowpack to melt earlier in the season at higher altitudes. The timing of snowmelt runoff on the western slope of the Sierra Nevada is more sensitive than it is on the eastern slope to changes in temperature, owing to predominantly lower altitudes on the west side. This difference in sensitivity suggests that basins on the east side of the Sierra Nevada have a more reliable water supply (as snow storage) than western-slope basins during warming trends.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Variations in northern Sierra Nevada streamflow. Implications of climate change
Series title:
Water Resources Bulletin
DOI:
10.1111/j.1752-1688.1993.tb03208.x
Volume
29
Issue:
2
Year Published:
1993
Language:
English
Publisher:
American Water Resources Association
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
283
Last page:
290
Number of Pages:
8