Campbell-scientific EC155 CO2 and H2O Closed-Path Gas Analyzer and EC1 Manual de usuario Pagina 59

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Appendix B. Useful Equations
The following table lists all the variables and constants used in the equations
below:
Table of Variables and Constants
Variable or Constant
Description
Units
c
ρ
CO
2
Mass Density mg m
-3
v
ρ
H
2
O Mass Density g m
-3
d
ρ
Mass Density of Dry Air g m
-3
c
X
CO
2
Molar Mixing Ratio
(concentration relative to dry air)
µmol mol
-1
v
X
H
2
O Molar Mixing Ratio
(concentration relative to dry air)
mmol mol
-1
c
M
Molecular Weight of CO
2
44 mg mmol
-1
d
M
Molecular Weight of dry air 0.029 g mmol
-1
v
M
Molecular weight of H
2
O 0.018 g mmol
-1
P
Ambient Pressure
kPa
R
Universal Gas Constant
8.3143×10
–6
kPa m3 K
–1
mmol
–1
T
Ambient Temperature
o
C
e
Vapor Pressure
kPa
f
Enhancement Factor Arbitrary
d
T
Dew Point Temperature
o
C
tmpd
T
_
Temporary variable for dew point
calculation
Arbitrary
Mass Density from Molar Mixing Ratios
( )
+
=
v
vcc
c
MTR
P
MX
ρ
ρ
15.273
10
6
(B-1)
( )( )
v
vv
v
XTR
PMX
++
=
100015.
273
ρ
(B-2)
( )
( )
15.273+
=
TR
MeP
d
d
ρ
(B-3)
( )
15.273
1000
+
+
=
TR
M
X
PX
P
d
v
v
d
ρ
(B-4)
B-1
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