A User's Manual for DELSOL3 - prod.sandia.gov - Sandia National ...

where SO is given by Equation (1II.B-7) and ALT is the altitude in km.
b) INSOL = 1. Hottel Model (Reference 21)
S = So{a + b exp (-c sece,)} (II1.B - 9)
where a = 0.4237 - 0.00821 (6.0 - ALT)2
b = 0.5055 + 0.00595 (6.5 - ALT)2
c = 0.2711 + 0.01858 (2.5 - ALT)2
c) INSOL = 2. Constant Insolation
S = SOLCON (constant specified in Namelist BASIC) (1II.B - 10)
d) INSOL = 3. Allen Model (Reference 22)
(E?++::)
S = So (1.0 - 0.263 (mxDPRES)r} (I1I.B - 11)
where m = air mass correction
DH20 = precipitable water overhead (mm)
DPRES = atmospheric pressure/sea level atmospheric pressure
DH20S11.53
7 = 0’367 ( DH20+7.88 )
The air mass correction, m, depends on the zenith angle, 88, according to:
where
1
p = - 2.0936381 - 0.04117341(90 - e,)
+ 0.000849854(90 - 08)’ (Reference 23)
70
(1II.B - 13)
Note that the altitude of the site affects the insolation via the relative
pressure DPRES.