PP Systems CIRAS-3 - Page 148

CIRAS-3 Operation Manual V. 1.09 148 support@ppsystems.com
Measured Data
CO2r
Current CO
2
concentration (µmol mol
-1
).
∆CO2
Change in CO
2
concentration during measurement sequence (µmol mol
-1
).
H2Or
Current H
2
O concentration (mb)
∆H2O
Change in H
2
O concentration during measurement sequence (mb).
Tsoil / Tsurface
Soil temperature if STP-1 is used (
o
C) or Surface temperature if SRC-2 is used
(
o
C).
∆Time
Change in time during measurement sequence (Seconds).
Calculated Data
FCO2q
Efflux rate of soil CO
2
based on quadratic fit (g m
-2
hr
-1
or µmol m
-2
s
-1
).
FCO2l
Efflux rate of soil CO
2
based on linear fit (g m
-2
hr
-1
or µmol m
-2
s
-1
).
Esoil
Rate of change in evaporation (g m
-2
hr
-1
or mmol m
-2
s
-1
).
RH%
Relative humidity based on Tsurface (%).
SRC-1 and SRC-2 Control Settings
CO2 Max
A user defined value representing the maximum CO
2
concentration (µmol mol
-1
).
If the CO
2
concentration reaches this level, the measurement sequence will end.
Time Max
A user defined value representing the maximum time (seconds). If the time
reaches this interval, the measurement sequence will end.
Tsurface
Approximate air temperature at the soil surface (
o
C). The default value is 25 but
this should be set to your actual surface temperature for accurate results when
using the SRC-1. This is not displayed when using the SRC-2 and Tsoil is
replaced with Tsurface.