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| Titel |
Has spring snowpack declined in the Washington Cascades? |
| VerfasserIn |
P. Mote, A. Hamlet, E. Salathé |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 12, no. 1 ; Nr. 12, no. 1 (2008-02-01), S.193-206 |
| Datensatznummer |
250010468
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| Publikation (Nr.) |
 copernicus.org/hess-12-193-2008.pdf |
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| Zusammenfassung |
| Our best estimates of 1 April snow water equivalent (SWE) in the
Cascade Mountains of Washington State indicate a substantial (roughly
15–35%) decline from mid-century to 2006, with larger declines at
low elevations and smaller declines or increases at high
elevations. This range of values includes estimates from observations
and hydrologic modeling, reflects a range of starting points between
about 1930 and 1970 and also reflects uncertainties about
sampling. The most important sampling issue springs from the fact that
half the 1 April SWE in the Cascades is found below about 1240 m,
altitudes at which sampling was poor before 1945. Separating the
influences of temperature and precipitation on 1 April SWE in several
ways, it is clear that long-term trends are dominated by trends in
temperature, whereas variability in precipitation adds "noise" to
the time series. Consideration of spatial and temporal patterns of
change rules out natural variations like the Pacific Decadal
Oscillation as the sole cause of the decline. Regional warming has
clearly played a role, but it is not yet possible to quantify how much
of that regional warming is related to greenhouse gas emissions. |
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