03-SierraNevadaData

03-SierraNevadaData - 3/24/2008 precipitation, m >2.0...

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3/24/2008 1 ESM 236: Snow data in the Sierra Nevada 1 Jeff Dozier Spring 2008 Spring 2008 SWE (snow water equivalence) and mass balance () -2 , 0 0 (snow density depth) [kg m ] (layers) (Divide by density of water to s d n ss n n SWE d zd z d ρ ρρ =≈ Δ 2 3 express as a depth equivalent) [m or mm] 1000kg m Mass balance: Snowfall - Sublimation - s w SWE d SWE = = Δ= Runoff Water balance: Runoff = Melt Storage ±Δ Spring 2008 A changing western snowpack? Less snow? Earlier melt? Service, R. F., As the West goes dry , Science, 20 Feb 2004 Spring 2008 3 >2.0 1.8 1.3 0.9 0.6 0.4 <0.3 >1.8 1.5 1.0 0.4 0 snowpack depth, m precipitation, m p r e c i s n o w a k t N 200 0 km Spring 2008 4 Manual measurement of SWE Spring 2008 5 Spring 2008 6
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3/24/2008 2 Measurement of SWE and Measurement of SWE and Snowfall Snowfall 7 Spring 2008 Automated measurement with snow pillow 8 Spring 2008 Measurements in western U.S. Spring 2008 9 Measurements in Tuolumne & Merced basins Spring 2008 10 California Cooperative Snow Survey • 268 snow courses now measured, a few since 1910 • + 15 abandoned only in last decade • State agencies – DWR, Central Sierra Snow Lab • Federal agencies – USDA NRCS, Forest Service National Park 11 • ~50,000 measurements – + 115 abandoned earlier • 36º-42ºN (33ºN among
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03-SierraNevadaData - 3/24/2008 precipitation, m &gt;2.0...

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