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03-SierraNevadaData

03-SierraNevadaData - precipitation m >2.0 1.8 1.3 0.9 0.6...

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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 s s n n SWE d z dz d ρ ρ ρ = × = Δ 2 3 express as a depth equivalent) [m or mm] 1000kg m Mass balance: Snowfall - Sublimation - s w SWE d SWE ρ ρ = = 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 precip snowpack increas ipitation in creases ases N 200 0 km Spring 2008 4 Manual measurement of SWE Spring 2008 5 Spring 2008 6
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