Campbell-scientific CPEC200 Closed-Path Eddy-Covariance System Bedienungsanleitung PDF herunterladen (Seite 79)

Appendix C. Output Variables

The next eleven values (wind_speed through flux samples) give several values

associated with the online fluxes. The number of samples included in these

calculations (flux_samples) includes only those samples for which all of the

data (sonic, irga, and pump) are OK.

The next twenty-two values (Ts_stdev through Tc_Uz_cov) are the covariance

matrices of the various flux components.

The next nineteen values (Ux_Avg through diag_CPEC_Avg) are averages of

the corresponding public variables. Many of these values are similar to lagged

values that are also found in this table, for example Ux_Lag_Avg and

Ux_Avg. These differ in two ways. First, the lagged versions represent an

average of a slightly different time period (up to two seconds earlier,

corresponding to the actual online flux calculations). Second, the lagged

versions are filtered to exclude values for which a diagnostic flag was set. The

non-lagged versions are simply the averages of all of the measurements within

the output interval. The rest of the values provide diagnostic information about

the CPEC200 system.

The value of the compile switches as shown in TABLE C-2 depends on the

constants as described in Section 5.4.2, Compile Switches. The code shown in

the table can be either V, S, or LWS, or a combination of two of the codes.

 V is defined if VALVE_MODULE = True

 S is defined if SCRUB_MODULE = True and

VALVE_MODULE = True

 LWS is defined if Leaf_Wetness_Sensor = True

TABLE C-2. Values stored in table flux

Compile

Switch

Variable Name

Units

Description

TIMESTAMP

Date and time the record was measured

RECORD

Record number

W∙m

-2

Sensible heat flux from sonic temperature Ts

W∙m

-2

Sensible heat flux from corrected sonic temperature

W∙m

-2

Latent heat flux

mg∙m

-2

∙s

-1

flux

tau

kg∙m

-1

∙s

-2

Momentum flux

u_star

m∙s

-1

Friction velocity

Ux_Lag_Avg

m∙s

-1

Average of (lagged) U

Uy_Lag_Avg

m∙s

-1

Average of (lagged) U

Uz_Lag_Avg

m∙s

-1

Average of (lagged) U

Ts_Lag_Avg

ºC

Average of (lagged) T

sonic_samples

Number of samples included in previous 5 averages

CO2_Lag_Avg

µmol∙mol

-1

Average of (lagged) CO

H2O_Lag_Avg

mmol∙mol

-1

Average of (lagged) H

cell_tmpr_Lag_Avg

ºC

Average of (lagged) cell temperature

cell_press_Lag_Avg

kPa

Average of (lagged) cell pressure

diff_press_Lag_Avg

kPa

Average of (lagged) differential pressure

irga_samples

Number of samples included in previous 5 averages

pump_flow_Lag_Avg

LPM

Average of (lagged) pump flow

pump_OK_samples

Number of samples included in previous average

C-3

1 2 ... 74 75 76 77 78 79 80 81 82 83 84 ... 111 112

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