EasyFlux^TM-DLIt is a real-time online data processing program developed by Campbell based on the CRBasic language, which can be downloaded for free by users. It can output the CO of the Campbell open circuit vorticity covariance measurement system (EC) after complete correction₂Flux, latent heat (water vapor) flux, sensible heat flux, and momentum flux. It utilizes commonly used correction methods in scientific literature to process raw time series data and obtain the final flux results.

stayEasyFlux^TM-DLBefore its launch, the Campbell data collector vorticity covariance program could only roughly estimate various flux values, and users needed to use PC version flux post-processing software to calculate fully corrected flux results. Now, the data collector is runningEasyFlux^TM-DLAfter each average cycle, the program can output fully corrected flux values online.

EasyFlux^TM-DLTests have been conducted at multiple sites, covering various environmental conditions including irrigated alfalfa fields, grasslands, corn, open water areas, forests, and deserts. The test results are consistent with the flux obtained using traditional PC version application software.

Advantages and features:

1. Without the need to spend a lot of effort post-processing massive raw time series data, the final flux results can be quickly obtained;

2. The generated flux output table is smaller than the time series table, allowing users to frequently download flux data through mobile networks, radio stations, or other low bandwidth remote communication methods;

3. You can view and download for free in the download section of the webpage;

4. Match the flux obtained through PC post-processing software (assuming the same filtering method is applied to the raw data and the same correction steps are selected);

5. Save time on high-frequency timing recalculation on mobile media;

6. Includes data quality diagnosis and footprint assessment;

7. Output uncorrected values and intermediate processed values to the audit data table for detailed data review;

8. Provide fully processed data in the US Flux Network format, suitable for CR6 data collectors.

Supported instruments and sensors:

requirement:

IRGASON integrated open circuit CO₂/H₂O gas analyzer and CSAT3A three-dimensional ultrasonic anemometer

EC150 open circuit CO₂/H₂O gas analyzer and CSAT3A three-dimensional ultrasonic anemometer

CR6 Data Collector(with CDM-A116 expansion board to accommodate energy balance sensor) and CR3000 data collector

NL115，NL116， Or CFM100 (CR3000 only)

CFMC2G，27158 （2 GB），33288 （8 GB） microSD Flash SLCMemory Card （Only CR6）， CFMC16GCompactFlash card （Only CR3000）

Optional:

CDM-A116 module connected to energy balance sensor

FW0 5, FW1 or FW3 fine wire thermocouple

HC2S3 or HMP155A air temperature and humidity

CNR4, NR01 or NR-LITE2 net radiometer

CS300 or LI200RX Total Radiometer

LI190SB optical quantum sensor

SI-111 Infrared Temperature Sensor

TE525MM tipping bucket rain gauge

TCAV soil average temperature probe (up to 2 in number)

CS616 or CS650 soil moisture probes (up to 2 in number)

HFP01 or HFP01SC soil heat flux plates (up to 4 in number)

GPS (unified time within the same network)

Detail description:

Provide fully corrected CO based on user-defined time intervals (e.g. 30 minutes)₂Flux, latent heat (water vapor) flux, and sensible heat flux output. It can also output many other variables, such as atmospheric properties, instrument diagnostic information, energy balance, and biosensor information. For the same set of data,EasyFlux^TM-DLThe online processing results have good consistency with other post-processing software data.

The main correction and processing steps are as follows:

Outlier removal and filtering of 10 Hz raw data:Comprehensive use of diagnostic values, signal strength, and measurement thresholds from 3D ultrasonic anemometers and gas analyzers.

Coordinate rotation:Optional two rotations (Tanner and Thurtell, 1969) or plane fitting (Wilczak, 2001)

Variable synchronization:By calculating CO₂And H₂The maximum value of O flux is used to convert CO₂And H₂The O-measurement values are synchronized with the three-dimensional wind speed measurement values separately (Horst and Lenschow, 2009; Foken et al, 2012), and additional constraints are added to ensure synchronization and make it reasonable.

Spectrum correction:Using commonly used spectral correction methods, including co spectral correction (Moore, 1986; Dijk, 2002; Moncrieff et al, 1989), transfer function for time period averaging correction (Kaimal et al, 1989), measurement path/volume averaging (Moore 1986; Moncrieff et al, 1997; Foken et al, 2012; Dijk, 2002), time constants (Montgomery, 1947; Shapland et al, 2014; Geankoplis, 1993), and sensor spatial separation correction (Horst and Lenschow, 2009; Foken et al, 2012) SND correction: applying an improved SND correction method (Schotanus et al., 1983) and following Van Dijk (2002) provided an overview of the completion plan, deriving sensible heat flux from ultrasonic sensible heat flux. Additionally, if the FW05, FW1, or FW3 provided by us are used, the directly measured fully corrected sensible heat flux can also be calculated from them.

Correction of Air Density Fluctuations:Applying the WPL equation (Webb et al., 1980)

Data quality grading:According to Foken et al. (2012), data quality classification is calculated by considering steady-state conditions, underlying surface turbulence characteristics, and wind direction.

Footprint assessment:Use Kljun et al. (2004) or Kormann and Meixner (2001) to calculate footprint features.

Energy closure:If an energy balance sensor is used, the energy closure can be calculated by integrating energy balance measurements, corrected sensible heat flux, and latent heat flux.

Ultrasonic shadow correction is optional

CO₂Correction:CO₂The temperature high frequency used for spectral correction is the default value, and non high frequency is optional. CO₂The temperature used for value correction will be recorded at the same time as the measurement frequency

Do you want to have EasyFlux immediately^TM-DL real-time online data processing program?

Please copy the following link and download it in your browser：

www.campbellsci.com/easyflux-dl