
ZENO
®
-3200 USER MANUAL
Coastal Environmental Systems (206) 682-6048 Page D-18
The algorithm is that in “Principles of Meteorological Analysis”, by W.J. Saucier. It is assumed that if
the temperature is below freezing then the surface layer is ice, and that if it is above freezing the surface
layer is water. This gives the following choice:
c
c
T
T
T
T
21875 0
17 2694 0
265 5 0
237 3 0
., ;
., ;
., ;
., .
The saturation vapor pressure e
S
is given by:
e
T
T
s
c
c
611.exp .
The saturation mixing ratio w
s
is given by:
w
e
pe
s
s
s
,..0 622
The actual mixing ratio w is given by:
w
r
w
s
100
.
The actual vapor pressure e is given by:
ep
w
w
.
Finally, the dewpoint D is found as:
D
e
e
ce
ce
log
.
log
.
.
611
611
The virtual temperature (T
V
) is calculated using the following equation:
w
w
TT
V
1
1
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