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Relation that describes mass balance, in meters water equivalent, as either varies with glacier surface altitude, evaluated at altitude Z i x Symbol Meaning c Daily accumulation c  Accumulation rate c 0 Factor relating precipitation at a reference site to precipitation at a particular glacier site d 0 , d 1 Emperical coefficients DDF i Degree-day factor for ice melt DDF s Degree-day factor for snow and firn melt PDD Positive degree days m Slope of a rating curve segment on a logarithmic plot n Number of glacier altitude grid points p Discharge when the quantity (S-S 0) equals 1 P ref Daily precipitation at a reference site q Stream discharge S Water stage S 0 Stage of effective zero stream discharge T Daily average air temperature T 2 Daily average air temperature at 2-m height at a given mass balance site T crit Air temperature at and below which precipitation falls as snow

Symbols Symbol Meaning  a Ablation rate b Mass balance for a period beginning with time t 0 and ending with time t 1 b Glacier mass balance b 0 Glacier initial balance increment, the glacier balance between the time of the beginning of the water year and the beginning of the balance year. b 1 Glacier final balance increment, the glacier balance between the time of the end of the water year and the end of the balance year b a Annual (water year) balance b a Glacier annual (water year) balance b n Net balance b n Glacier net balance b s Summer balance b s Glacier summer balance b w Winter balance b w Glacier winter balance b m (s) Measured winter snow balance b m (s) Glacier measured winter snow balance b w (s) Maximum winter snow balance b w (s) Glacier maximum winter snow balance b(Z i) A relation that describes snow water equivalent or mass balance, in meters water equivalent, as either varies with glacier-surface altitude, evaluated at altitude Z i  c Accumulation rate m Slope of a rating curve segment on a logarithmic plot n Number of glacier altitude grid points p Discharge when the quantity (S-S 0) equals 1 q Stream discharge S Water stage S 0 Stage of effective zero stream discharge T Average June-through-September air temperature at the Hut X Position in local horizontal coordinate system along the X-axis, which increases from west to east Y Position in local horizontal coordinate system along the Y-axis, which increases from south to north Z Altitude Z i Altitude of a grid point in a glacier altitude grid

A comparison of the remote-sensing SSEBop method for estimating ETa and the Hamon temperature method for estimating potential ET (ETp) also was conducted, using regressions of all available county averages of ETa for 2005

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