Introduction to the OPEC Open Eddy (Eddy Covariance) Flux

Introduction to the systemThe eddy observation system, using the principle of eddy covariance, is a micrometeorological measurement method that uses fast-response sensors to measure the material excha

  • Product Name:Introduction to the OPEC Open Eddy (Eddy Covariance) Flux
  • Model:OPEC
  • Country:USA

Introduction to the system

The eddy observation system, using the principle of eddy covariance, is a micrometeorological measurement method that uses fast-response sensors to measure the material exchange and energy exchange between the atmosphere and the underlying surface. It is a standard method to directly measure the flux, and it is the key technology to measure the exchange flux of matter and energy in the ecosystem. Due to different measurement methods and principles, eddy motion observation systems are divided into open-circuit eddy motion observation systems and closed-circuit eddy motion observation systems.

The eddy motion observation system can measure energy flux (sensible heat flux, latent heat flux, momentum flux), material flux (CO2 / H2O / CH4 / N2O) and some aerodynamic parameters, etc. It is mainly used in boundary layer theory Research, atmospheric diffusion, energy budget research, moisture and other material budgets and many other fields.

Flux observation is suitable for various underlying surface environments such as forests, grasslands, farmland, deserts, cities, and waters. Research; as an effective means to measure the information of material and energy exchange between ecosystems and the atmosphere, it provides an important data basis for analyzing the interaction of the geosphere-biosphere-atmosphere, and provides support for large-scale, long-term and continuous scientific research.

System overview

Open-circuit eddy systems can measure sensible heat flux, momentum flux, and other fluxes between the atmosphere and the Earth's surface. This system includes a data collector, fast response, 3D ultrasonic anemometer and fast response scalar sensor. An independent low-speed response sensor for measuring temperature and humidity is also needed, and the measured data can be used as a reference for calculating meteorological variables. The horizontal wind speed and direction can be calculated by the data collector and the data measured by the three-dimensional ultrasonic anemometer.

Measurement parameters of the system

Carbon dioxide flux, water vapor flux, momentum flux, turbulence intensity, sensible heat flux, 3D ultrasonic wind speed, ultrasonic air temperature, air temperature and atmospheric pressure.

System Features

●Customizable system that provides a range of measurement options

●Measured values are synchronized in time and work through the same electronic device

●Low noise

● Fully integrated, turnkey system

●User-selectable output bandwidth

●Low power consumption, suitable for solar power supply

●Suitable for rugged environments

●Can be placed in the field for long-term monitoring

●Extended data storage through compact flash cards and storage modules

● Extensive diagnostic parameters can alert suspicious data

Both gas analyzers and ultrasonic anemometers are managed

EasyFlux_DL online processing software

EasyFlux_DL software is an embedded intelligent eddy motion correlation online processing software developed based on CSI data collector. Relying on the data collector, the software has the functions of data acquisition, analysis, calculation, storage and transmission; through 3G and other wireless communication, users can directly and remotely obtain the flux data that is ultimately used for scientific research; and can realize site networking, remote Access functions such as downloading data, setting site parameters, and more. It is suitable for the field of eddy flux research.

EasyFlux_DL intelligent software is used to automatically calculate the momentum, sensible heat, CO2, H2O flux of the atmospheric boundary layer; the data collector is the core of the system, which realizes the whole process of system control, sensor measurement, data storage, data processing and output; the following The flow chart explains the whole process of data acquisition and processing inside the data collector; the process includes outlier elimination, maximum covariance finding delay, coordinate rotation, frequency correction, ultrasonic temperature correction (SND), WPL correction, source area calculation, Data quality classification.

System composition

◆The components of the basic version of the open-circuit whirl system

●Ultrasonic anemometer (CSAT3A)

●Infrared gas analyzer (EC150)

●Integrated ultrasonic anemometer and infrared gas analyzer (IRGASON)

●Data collector

●Memory expansion module

◆The components of the extended version of the open-circuit whirl system (you can choose to add the following sensors on the basic version)

●Net radiation sensor (NR-LITE2)

●Soil heat flux sensor (HFP01SC-L)

●Soil temperature sensor (TCAV-L)

●Soil moisture content (CS616-L)

●Fine wire thermocouple (FW05)

●High sensitivity air humidity sensor (KH20)

●Air temperature and humidity sensor (HMP155A-L)