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Shasta Trinity National Forest Watershed Vulnerability Assessment, Pacific Southwest Region (R5) Precipitation Variability Figure 5. Shasta Trinity National Forest Mean Annual Temperature Trends Precipitation variability has significantly increased at all gauges in Sacramento River Basin (Southern Cascade Province) (McCloud and Mt Shasta Stations, Figure 6) on the east side of the Forest. This pattern in not evident in the west in the Trinity portion of Klamath Basin (Big Bar, Figure 6). 190 Assessing the Vulnerability of Watersheds to Climate Change
Shasta Trinity National Forest Watershed Vulnerability Assessment, Pacific Southwest Region (R5) Figure 6. Shasta Trinity National Forest Trends in Precipitation Variability Forest Snow Depth and Mount Shasta Glacier Trends Minimum and mean snow depths at all snow stations on the Forest have decreased (Figure 7). Maximum snow depth at all stations in the Trinity River basin has decreased over the period of record. This trend is not consistent across the Forest, as maximum snow depths in the Central Valley Region (the Southern Cascade Province, Figure 7) are increasing. Growth of glaciers on Mount Shasta is consistent with increase in maximum depths in the Southern Cascades (Figure 7). Shasta’s glaciers are among the few in the world that are still growing. Glacier changes are dictated by air temperature and precipitation. Warming can lead to increases in precipitation (and thus glacier ice accumulation) (Nesje et al. 2008). 191 Assessing the Vulnerability of Watersheds to Climate Change
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AUTHORS AND CONTRIBUTORS Authors* M
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ASSESSSING THE VULNERABILITY OF WAT
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staff; the task group included repr
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Figure 2. Conceptual model for asse
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Figure 3. Density of springs and sm
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Using Historic Data One finding con
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NF (Region 8) relied on information
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level of uncertainty. Though there
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climate (Casola et al. 2005). Only
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sensitivity. Most were derived from
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The sensitivity evaluation typicall
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in exposure. The result of combinin
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highest priority for management act
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to information affected the assessm
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with and rely on in many resource d
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Pilot National Forest Reports Conte
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Assessment of Watershed Vulnerabili
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Gallatin National Forest Watershed
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Helena National Forest Watershed Vu
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Grand Mesa, Uncompahgre and Gunniso
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White River National Forest Watersh
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Coconino National Forest Watershed
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Chequamegon-‐Nicolet National F
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Chugach National Forest Watershed V
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