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 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 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

Related Publications


Cook DR. 2018. Eddy Correlation Flux Measurement System (ECOR) Instrument Handbook. Ed. by Robert Stafford, U.S. Department of Energy. DOE/SC-ARM/TR-052.

Ma H, S Klein, S Xie, C Zhang, S Tang, Q Tang, C Morcrette, K Van Weverberg, J Petch, M Ahlgrimm, L Berg, F Cheruy, J Cole, R Forbes, W Gustafson, M Huang, Y Liu, W Merryfield, Y Qian, R Roehrig, and Y Wang. 2018. "CAUSES: On the Role of Surface Energy Budget Errors to the Warm Surface Air Temperature Error Over the Central United States." Journal of Geophysical Research: Atmospheres, 123(5), 10.1002/2017JD027194.

Turner D, V Wulfmeyer, A Behrendt, T Bonin, A Choukulkar, R Newsom, W Brewer, and D Cook. 2018. "Response of the Land-Atmosphere System Over North-Central Oklahoma During the 2017 Eclipse." Geophysical Research Letters, 45(3), 10.1002/2017GL076908.


Phillips T, S Klein, H Ma, Q Tang, S Xie, I Williams, J Santanello, D Cook, and M Torn. 2017. "Using ARM Observations to Evaluate Climate Model Simulations of Land-Atmosphere Coupling on the U.S. Southern Great Plains." Journal of Geophysical Research: Atmospheres, 122(21), doi:10.1002/2017JD027141.

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.


Klein PM, TA Bonin, JF Newman, DD Turner, PB Chilson, CE Wainwright, WG Blumberg, S Mishra, M Carney, EP Jacobsen, S Wharton, and RK Newsom. 2015. "LABLE: A Multi-Institutional, Student-Led, Atmospheric Boundary Layer Experiment." Bulletin of the American Meteorological Society, 96(10), 10.1175/bams-d-13-00267.1. ONLINE.

Anber U, P Gentine, S Wang, and A Sobel. 2015. "Fog and rain in the Amazon." Proceedings of the National Academy of Sciences, 112(37), 10.1073/pnas.1505077112. ONLINE.

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.

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