Appendix, B. list of symbols and abbreviations, Appendix b. list of symbols and abbreviations – Kipp&Zonen LAS MkII Scintillometer User Manual
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77
Instruction Manual - LAS MkII Scintillometer
.
A
T
A
Q
C
p
C
n
2
C
T
2
C
Q
2
d
D
f
T
g
G
s
H
H
free
I
L
L
v
E
L
MO
Pot
P
PU
C
n
2
Q
Q*
R
d
R
v
T
T
*
u
u
*
U
C
n
2
U
DEMOD
U
TH_T
z
LAS MkII
z
0
z
u
β
κ
v
λ
ρ
σ
2
σ
2
lnI
σ
2
σ
2
σ
2
Ψ
m
.
wavelength dependent constants
wavelength dependent constants
heat capacity of air at constant pressure
structure parameter of the refractive index of air
(
)
structure parameter of temperature
structure parameter of humidity
zero-displacement height
effective aperture diameter of receiver
universal stability function
gravitational acceleration
soil heat flux
surface sensible heat flux
free convection sensible heat flux
signal strength, or intensity (
I = U
DEMOD
)
path length
latent heat flux (or evaporation)
Obukhov length
path length setting at transmitter power adjustment knob
air pressure
scaled
C
n
2
(
C
n
2
=
PU
C
n
2
• 10
-15
)
absolute humidity
net radiation
specific gas constant for dry air
specific gas constant for water vapour
absolute air temperature
temperature scale
wind speed
friction velocity
log
C
n
2
signal [V]
(
)
demodulated signal [V] (
U
DEMOD
=
I)
thermistor signal transmitter unit
(effective) height of beam/path
aerodynamic (surface) roughness length
height of wind speed measurements
Bowen ratio (β = H/LvE)
von Kármán constant
wavelength of beam radiation
density of air (at sea level !)
variance
variance of natural logarithm of intensity fluctuations, ln(
I)
variance of
U
DEMOD
or intensity
I
variance of
U
C
n
2
integrated stability function for momentum
.
[-]
[-]
[~1005 J K
-1
kg
-1
]
[m
-2/3
]
[K
2
m
-2/3
]
[kg
2
m
-6
m
-2/3
]
[m]
[m]
[-]
[~9.81 m/s
2
]
[W/m
2
]
[W/m
2
]
[W/m
2
]
[V]
[m]
[W/m
2
]
[m]
[-]
[Pa]
[m
-2/3
]
[kg/m
3
]
[W/m
2
]
[~287 J K
-1
kg
-1
]
[~461.5 J K
-1
kg
-1
]
[K]
[K]
[m/s]
[m/s]
[0 to 2 V]
[0 to 2 V]
[0 to 8 V]
[m]
[m]
[m]
[-]
[~0.40]
[850 x 10
-9
m]
[~1.2 kg/m
3
]
[-]
[-]
[V
2
]
[V
2
]
[-]
Appendix
B. List of symbols and abbreviations
C
n
2
= 10
(U
C
n
2
-12)
C
n
2
= 10
(U
C
n
2
-12)
U
DEMOD
U
C
n
2
I
=