Geoscience Reference
In-Depth Information
10
interpolated
pressure level data
8
6
4
2
0
0
5
10
15
20
25
Water vapor pressure [hPa]
Fig. 5
Water vapor pressure versus height of the meteorological values provided with pressure
level data (
red crosses
) and from interpolation (
black line
)
Fig. 6
Pressure versus height
of the meteorological values
provided with pressure level
data (
red crosses
) and from
inter- and extrapolation (
black
line
)
140
interpolated
pressure level data
120
100
80
60
40
20
0
10
−5
10
0
10
5
Ln of pressure [hPa]
2.6 Reference Pressure
The reference pressure is a mean pressure value often realized at the topography by
calculating the long-term average of surface pressure. It is required because many
applications are more accurate when using deviations from the mean pressure rather
than the full values themselves. The reference pressure is needed in various space
geodetic applications, and it is related to other investigations of the Earth system.
Examples are the determination of the atmospheric pressure loading displacements
(Rabbel and Zschau
1985
; Rabbel and Schuh
1986
; van Dam and Wahr
1987
;van
