Campbell-scientific CPEC200 Closed-Path Eddy-Covariance System Manual de usuario descargar pdf (Pagina 77)

Appendix C. Output Variables

The CPEC200 program stores data in several output tables. Details are given

for each table.

ts_data

The primary output table is ts_data table which gives time-series data. This

table stores each sample of the raw CPEC200 data (ten records per sec). The

CPEC200 program stores this table in multiple files on the memory card, with

a new file started each day at midnight. The size of these daily files depends

on the compile flags. With the default settings, each file is approximately 62

kB and a 2 GB memory card will store data for approximately four weeks

before the CPEC200 program begins to delete old files to make room for new

files. If no valve module is used, the time-series files are slightly smaller,

approximately 55 kB. The largest files will occur when the compile switch is

set to store all diagnostic information, and use the valve module and scrub

modules. These daily files are approximately 120 kB in size. See Section

5.4.2, Compile Switches, for details on setting program constants. If more

storage is required, a 16 GB memory card, the CFMC16G, is available.

The values stored in table ts_data are shown in TABLE C-1. Values that are

stored or not stored depending on compile switch settings have a V, D or S in

the first column of TABLE C-1.

 V means the value is stored only if VALVE_MODULE =

True

 D means the value is stored only if SaveAll_diagnostics =

True

 S means the value is stored only if SCRUB_MODULE =

True

If multiple compile switches are listed for a value, the value is stored in the

table only if all of the compile switches are True. If no compile switches are

listed for a value, the value is always stored in the table.

TABLE C-1. Values stored in table ts_data

Compile

Switch

Variable

Name

Units

Description

TIMESTAMP

Date and time the record was measured

RECORD

Record number

EC_mode

Boolean flag: True if the pump is on and no zero/span sequence

is running

diag_cpec

CPEC200 diagnostic word

m∙s

-1

Wind velocity X component

m∙s

-1

Wind velocity Y component

m∙s

-1

Wind velocity Z component

ºC

Sonic virtual temperature

diag_sonic

CSAT3A diagnostic word

CO2

µmol∙mol

-1

mixing ratio, relative to dry air

H2O

mmol∙mol

-1

O vapor mixing ratio, relative to dry air

diag_irga

EC155 diagnostic word

cell_tmpr

ºC

Temperature of the sample cell

C-1

1 2 ... 72 73 74 75 76 77 78 79 80 81 82 ... 111 112

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