Atmospheric Radiation Measurement Climate Research Facility US Department of Energy
Capabilities > Instruments > ecor

30ecor

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ECOR: surface vertical fluxes of momentum, sensible heat, and latent heat, 30-min avg (30ecor)

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The eddy correlation (ECOR) flux measurement system provides half-hour measurements of the surface turbulent fluxes of momentum, sensible heat, latent heat, and carbon dioxide. The ECOR uses the eddy covariance technique, which involves correlation of the vertical wind component with the horizontal wind component, air temperature, water vapor density, and CO2 density. The system includes:

  • A fast-response, 3D wind sensor (sonic anemometer) to record the orthogonal wind components and the speed of sound (SOS), which is used to derive the air temperature;
  • An open-path infrared gas analyzer (IRGA) to obtain the water vapor density and CO2 density; and
  • An IRGA to obtain the methane density (at the NSA and OLI sites only).

ECOR systems are deployed where other methods for measuring surface fluxes, such as energy balance Bowen ratio systems (EBBR), are difficult to use.

Uncorrected turbulent fluxes are available in the 30ecor datastream. It is recommended that routine ECOR corrections are applied to the data prior to use, and corrected fluxes are available in the 30qcecor VAP. In October 2019 the ECOR systems at SGP were upgraded with newer-model instruments, including the addition of a microprocessor allowing both uncorrected and corrected fluxes in a single datastream, ecorsf, and eliminating the need for the ECOR VAP at these sites.

Measurements

CO2 flux
Sensible heat flux
Latent heat flux
Mean CO2 density
Friction velocity

Location

Southern Great Plains
  • Latitude: 38.201005
  • Longitude: -95.897005
  • Publication Date: 2004-03-10
  • Start Date: 2004-03-10
  • End Date: 2009-10-24
  • Last Updated: 2009-11-03

Instrument Mentor

https://www.arm.gov/connect-with-arm/organization/instrument-mentors/list#ecor

David Cook
Argonne National Laboratory
Mikhail Pekour
Pacific Northwest National Laboratory
Ryan Sullivan
Argonne National Laboratory
Evan Keeler
Argonne National Laboratory

DOI / Citation

http://dx.doi.org/10.5439/1025039
Atmospheric Radiation Measurement (ARM) user facility. 2004, updated hourly. Eddy Correlation Flux Measurement System (30ECOR). 2004-03-10 to 2009-10-24, Southern Great Plains (SGP) LeRoy, KS (Extended) (E3). Compiled by R. Sullivan, M. Pekour, D. Cook and E. Keeler. ARM Data Center. Data set accessed at http://dx.doi.org/10.5439/1025039.