is ice flux and b is mass balance. For (small) changes
in glacier geometry with respect to a datum (often steady) state, perturbations in ice thickness,
flux and mass balance will satisfy
¶(Dh)
¶t
+
¶(Dq)
¶x
= Db or
¶(Dh)
¶t
+~ (D~q) = Db : (2)
Changes in mass balance are the driving factor of glacier changes in climate change simu-
lations. If the datum glacier is initially comparatively close
/media/ces/ces-glacier-scaling-memo2009-01.pdf
Delta Change Method
(correction of observed precipitation)
Transformation of precipitation
cont
fut
obsfut M
M
PP =
Observeret n dbør
0
5
10
15
20
25
30
1-12-99 11-12-99 21-12-99 31-12-99
Dato
N
ed
bø
r
(m
m
/d
ag
)
Observeret
Skal ring af e
5
10
15
20
25
30
35
4
- - - -
t
N
ed
bø
r
(m
m
/d
ag
)
Observeret D lta Change
Critical assumption:
Future dynamics = present dynamics
No change in number
/media/loftslag/Refsgaard_2-uncertainty.pdf
1998] and RCM output such
as incoming and outgoing, short- and long-wave radiation,
temperature, water vapor pressure, and wind speed:
ETref ¼
0:408D Rn Gð Þ þ g 900T þ 273 u2 es eað Þ
Dþ g 1þ 0:34u2ð Þ ð3Þ
where ETref is reference evapotranspiration (mm d1), Rn is
net radiation at the crop surface (MJ m2 d1), G is soil heat
flux density (MJ m2 d1), T is mean daily air temperature
at 2 m
/media/loftslag/vanRoosmalen_etal-2009-WRR_2007WR006760.pdf