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reference : Changes toward earlier streamflow timing across western North America

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article
Changes toward Earlier Streamflow Timing across Western North America
Bibliographic fields
reftype Journal Article
Abstract The highly variable timing of streamflow in snowmelt-dominated basins across western North America is an important consequence, and indicator, of climate fluctuations. Changes in the timing of snowmelt-derived streamflow from 1948 to 2002 were investigated in a network of 302 western North America gauges by examining the center of mass for flow, spring pulse onset dates, and seasonal fractional flows through trend and principal component analyses. Statistical analysis of the streamflow timing measures with Pacific climate indicators identified local and key large-scale processes that govern the regionally coherent parts of the changes and their relative importance.|Widespread and regionally coherent trends toward earlier onsets of springtime snowmelt and streamflow have taken place across most of western North America, affecting an area that is much larger than previously recognized. These timing changes have resulted in increasing fractions of annual flow occurring earlier in the water year by 1-4 weeks. The immediate (or proximal) forcings for the spatially coherent parts of the year-to-year fluctuations and longer-term trends of streamflow timing have been higher winter and spring temperatures. Although these temperature changes are partly controlled by the decadal-scale Pacific climate mode [Pacific decadal oscillation (PDO)], a separate ani significant part of the variance is associated with a springtime warming trend that spans the PDO phases.
Accession Number 158
Author Stewart, I.T. Cayan, D.R. Dettinger, M.D.
Author Address Stewart, IT (reprint author), Scripps Inst Oceanog, 9500 Gilman Dr, La Jolla, CA 92093 USA; Scripps Inst Oceanog, La Jolla, CA 92093 USA; US Geol Survey, La Jolla, CA USA
DOI 10.1175/JCLI3321.1
Date APR 15 2005
ISSN 0894-8755
Issue 8
Journal Journal of Climate
Keywords UNITED-STATES; CLIMATE-CHANGE; MASS-BALANCE; ATMOSPHERIC CIRCULATION; PACIFIC-NORTHWEST; SNOWMELT RUNOFF; SIERRA-NEVADA; RIVER-BASIN; VARIABILITY; PRECIPITATION
Language English
Pages 1136-1155
Title Changes toward earlier streamflow timing across western North America
Volume 18
Year 2005
Bibliographic identifiers
.reference_type 0
_chapter ["Ch. 3: Water Resources FINAL","Appendix 3: Climate Science FINAL","Ch. 21: Northwest FINAL"]
_record_number 2957
_uuid e4a5a03e-0138-4ebb-98ad-6fb28ec56be5