ecor: Eddy Correlation Flux Measurement System

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 concentration. 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 concentration; 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.


  • Fixed
  • AMF1
  • AMF2
  • AMF3

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Nicolas J, A Vogelmann, R Scott, A Wilson, M Cadeddu, D Bromwich, J Verlinde, D Lubin, L Russell, C Jenkinson, H Powers, M Ryczek, G Stone, and J Wille. 2017. "January 2016 extensive summer melt in West Antarctica favoured by strong El Nino." Nature Communications, 8, 15799, doi:10.1038/ncomms15799.


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Jundt R. 2015. ARM Mobile Facility Fact Sheet. DOE/SC-ARM-15-022.

Mechem DB, SE Giangrande, CS Wittman, P Borque, T Toto, and P Kollias. 2015. "Insights from modeling and observational evaluation of a precipitating continental cumulus event observed during the Midlatitude Continental Convective Clouds Experiment field campaign." Journal of Geophysical Research: Atmospheres, 120(5), 10.1002/2014jd022255.


Chandra A, K Pavlos, and A Bruce. 2013. "Multiyear Summertime Observations of Daytime Fair-Weather Cumuli at the ARM Southern Great Plains Facility." Journal of Climate, 26(24), 10.1175/jcli-d-12-00223.1.

Fang M, BA Albrecht, VP Ghate, and P Kollias. 2013. "Turbulence in continental stratocumulus, Part II: Eddy dissipation rates and large-eddy coherent structures." Boundary-Layer Meteorology, 150(3), 10.1007/s10546-013-9872-4.

Fang M, BA Albrecht, VP Ghate, and P Kollias. 2013. "Turbulence in continental stratocumulus, Part I: External forcings and turbulence structures." Boundary-Layer Meteorology, 149(454), 10.1007/s10546-013-9873-3.

Williams I, M Torn, and W Riley. 2013. Clouds, Aerosols, and Water and Carbon Cycles Over the Southern Great Plains. Presented at 4th Atmospheric System Research (ASR) Science Team Meeting. Potomac, MD.

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