Training Course

Theories of CO2 and H2O flux measurements and operations for open- and closed-path eddy-covariance flux systems

Campbell Scientific Incorporation (CSI) will offer AsiaFlux 2022 Flux Training Course from September 18 to 19, 2022 in Sarawak Tropical Peat Research Institute, Kuching, Sarawak, Malaysia. For CO2 and H2O flux measurements, CSI is one of the world-class manufacturers to produce instrument and sensor systems including the related software. An eddy covariance flux system includes sonic anemometer, infrared H2O and CO2 analyzer, datalogger control and measurement module, CDM-A116/VOLT116 Ultimate Analog Measurement Expansion, and some micrometeorological sensors. The software includes EasyFlux-DL-CRXOP/CP, EasyFlux-PC, EasyFlux-Web, and LoggerNet, etc. Taking the advantage of systematic solutions from CSI for eddy covariance flux measurements, this training course will be more orientated towards the instrument operations and software applications for trainees while lectures for underlying theories of flux measurements will also be given.
For the purpose of demonstration, operation and students’ practice, CSI will provide two eddy-covariance instrument systems:

  1. One open-path eddy-covariance system
    1. IRGASON: Integrated CO2/H2O Open-Path Gas Analyzer and 3D Sonic Anemometer
    2. A CR6 Control and Measurement Module
    3. A CDM-A116 Ultimate Analog Measurement Expansion
    4. Radiation, soil heat flux, soil temperature and moisture, and rain gauge, etc. 
  2. One closed-path eddy-covariance system (CPEC310)
    1. EC155 CO2/H2O Closed-Path Gas Analyzer
    2. CSAT3A 3D Sonic Anemometer
    3. Pump, valve module, and scrub module
    4. A CR6 Control and Measurement Module
    5. A CDM-A116 Ultimate Analog Measurement Expansion
    6. Radiation, soil heat flux, soil temperature and moisture, and air temperature and relative humidity, etc. 
Date  : 18th – 19th September 2022
Venue : Board Room, TROPI
Speakers : (i) Bai Yang
   (ii) Pimnarah Ngamwuttiwong
   (iii) Xinhua Zhou

Course Lecturers:  

Dr. Bai Yang (Campbell Scientific, Inc)
Dr. Xinhua Zhou (Campbell Scientific, Inc)




Day 1 (September 18)

8:15 ~ 10:25
1.Fundamental variables and commonly used instruments (by Yang)

  1. Four components of radiation, net radiation, and the related instruments (pyranometer, pyrgeometer, net radiometer, quantum sensor: CS320, CS301, CNR4, SN500, CS310)
  2. Air temperature (RTDs, thermocouple, thermistor, HMP155A, EE181, HygroVUE10)
  1. Humidity (HMP155A, HygroVUE5, EC150, EC155)
  2. Barometric pressure (BaroVUE10, CS100)
  3. Soil temperature (TCAV)
  4. Soil moisture (SoilVUE10, CS655)
  5. Precipitation (RainVUE10, TE525)
  6. Wind speed and direction (CSATA, CSAT3AH, CSAT3B, CSAT3BH, wind vane and cup anemometer)
  7. Greenhouse gases (EC150, EC155, IRGASON, TGA200A)

2.Major sensors, modules, and eddy-covariance systems for flux measurements (by Zhou)

  1. EC150, EC155, and IRGASON Infrared CO2 and H2O analyzers
  2. CSAT3, CSAT3A, CSAT3AH, and CSAT3B, and CSAT3BH sonic anemometer
  3. CR6 and CR1000X control and measurement module
  4. CDM-A116/VOLT116 Ultimate Analog Measurement Expansion
  5. Open-path eddy-covariance systems (IRGASON and CSAT3A+EC150)
  6. Closed-path eddy-covariance systems (CPEC306 and CPEC310)  
  7. Atmospheric profile system (AP200)

10:25 ~ 10:40     Coffee break

10:40 ~ 12:00

3.Fundamental theory of atmospheric boundary layer and turbulence (by Yang)

  1. Definition of Atmospheric boundary layer
  2. Turbulence flow structure and characteristics
  3. Statistic description and governing equations for turbulence
  4. Reynolds decomposition
  5. Atmospheric stability
  6. Momentum fluxes
  7. Scalar fluxes (CO2 and H2O flux, sensible and latent heat fluxes)
  8. Examples for CO2 and H2O fluxes      

 Questions and Answers

12:00 ~ 13:00     Lunch

13:00 ~ 15:00
4. Eddy-covariance system setup, operation, and practice (Part I; the whole class will be split into multiple groups taking turns to practice the following steps)

  1. Basic operations of LoggerNet (Device Config Utility, CRBasic Editor, Setup, Connect)
  2. Basic data logger operations and controls (reset clock, upload program, file control, data collection)
  3. Set up an IRGASON open-path eddy-covariance (OPEC) system (completed by lecturers prior to this session)
  4. Configure and compile the EasyFlux-DL-CR6OP to the OPEC system
  5. Wire radiation, soil heat flux plate, and other micrometeorological sensors to the OPEC system
  6. Upload the EasyFlux-DL-CR6OP to the OPEC system, set station variables, and connect to logger net to review the on-site measurements, variable values, and diagnosis warnings
  7. Review time series file, hourly files, and system note files
  8. Set up a CPEC310 closed path eddy covariance (CPEC) system (completed by lecturers prior to this session)
  9. Configure and compile the EasyFlux-DL-CR6CP to the CPEC system
  10. Wire radiation, soil heat flux plate, and other micrometeorological sensors to the CPEC system
  11. Upload the EasyFlux-DL-CR6CP to the CPEC system, set station variables, and connect to logger net to review the on-site measurements, variable values, and diagnosis warnings
  12. Review time series file, hourly files, and system note files

15:00 ~ 15:15     Coffee break

15:15 ~ 17:00
4. (Continued) Eddy-covariance system setup, operation, and practice (Part I)




Day 2 (September 19)

8:15 ~ 10:25
5.Major correction theories in data processing for flux computation (by Zhou)

  1. Coordinate rotations
  2. Lag maximization
  3. Low- and high-frequency correction
  4. Moisture correction for sonic temperature flux to be sensible heat flux
  5. Correction flux measurements for density effects due to heat and water vapor transfer   

6.Data quality assessment, assurance, and control (by Yang)

  1. Diagnostic information from the EC system (CSATs and IRGAs)
  2. Data quality grading
  3. Footprint analysis
  4. Common data quality issues
  5. Algorithms for data quality control
  6. Good practices for high quality data

10:25 ~ 10:40     Coffee break

10:40 ~ 12:00
7.Software (by Zhou)

  1. EasyFlux-DL-CR6OP and -CR1000XOP
  2. EasyFlux-DL-CR6CP and -CR1000XCP
  3. EasyFlux-PC
  4. EasyFlux-Web

Questions and Answers

12:00 ~ 13:00     Lunch

13:00 ~ 15:00
8. Eddy-covariance system setup, operation, and practice (Part II; the whole class will be split into multiple groups taking turns to practice the following steps)

  1. (Continuation from Day 1) Upload the EasyFlux-DL-CR6OP to the OPEC system, set station variables, and review variable values, diagnosis warnings, time series file, hourly files, and system note files
  2. Manual CO2 and H2O zero for the OPEC systems
  3. Manual CO2 span for the OPEC systems
  4. (Continuation from Day 1) Upload the EasyFlux-DL-CR6CP to the CPEC system, set station variables, and review variable values, diagnosis warnings, time series file, hourly files, and system note files
  5. Attendant auto CO2 and H2O zero for the CPEC systems 
  6. Attendant auto CO2 span for the CPEC systems
  7. Attendant auto zero and span sequence.

15:00 ~ 15:15     Coffee break

15:15 ~ 17:00
8. (Continued) Eddy-covariance system setup, operation, and practice (Part II)