Instruction manual

D-1
APPENDIX D. LIST OF VARIABLES AND CONSTANTS
ρ′
v
g m
-3
Instantaneous deviation of water vapor density from mean
ρ
a
g m
-3
Density of moist air
ρ
o
g m
-3
Density of oxygen
ρ
v
g m
-3
Water vapor density
BD kg m
-3
Bulk density of soil
C
o
(0.2095) fraction concentration of oxygen in the atmosphere
C
p
J kg
-1
K
-1
Heat capacity of moist air
CP J kg
-1
K
-1
Heat capacity of moist air
e kPa Vapor pressure
e
s
kPa Saturation vapor pressure
FW m
-2
Soil heat flux measured by the heat flux plates
GW m
-2
Total soil heat flux
h m Height of the Atmospheric Boundary Layer
HW m
-2
Sensible heat flux
k
o
m
3
g
-1
cm
-1
(0.0045) Absorption coefficient for oxygen
k
o1
m
3
g
-1
cm
-1
Absorption coefficient for oxygen on line 1
k
o2
m
3
g
-1
cm
-1
Absorption coefficient for oxygen on line 2
k
w
m
3
g
-1
cm
-1
Absorption coefficient for water vapor
LE W m
-2
Latent heat flux
L
v
J g
-1
Latent heat of vaporization
LV J g
-1
Latent heat of vaporization
M
a
g mol
-1
(32) molecular weight of oxygen
OCLE W m
-2
Oxygen correction on latent heat flux
OCSD g m
-3
Oxygen correction on variance of water vapor density
P kPa Atmospheric pressure
q kg kg
-1
Specific humidity
Q kg kg
-1
Specific humidity
R J mol
-1
K
-1
(8.31) universal gas constant
RA kg m
-3
Density of moist air
RD kg m
-3
Density of dry air
RH % Relative humidity
R
n
W m
-2
Net radiation
R
V
J kg
-1
K
-1
Gas constant for water vapor
SW m
-2
Soil storage term
SDR g m
-3
Standard deviation of water vapor density
T
′
C Instantaneous deviation of air temperature from the mean
TA K Air temperature
V
h
mV Signal voltage from the krypton hygrometer
V
o1
mV Signal voltage for oxygen on line 1
V
o2
mV Signal voltage for oxygen on line 2
W kg kg
-1
Soil water content on a mass basis
w
′
m s
-1
Instantaneous deviation of vertical wind from the mean
x cm Krypton hygrometer path length
z m Height
z
om
m Roughness length for momentum