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 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.

Locations

  • Fixed
  • AMF1
  • AMF2
  • AMF3

2020

Williams I, J Lee, J Tadić, Y Zhang, and H Chu. 2020. "Modeling spatial heterogeneity in surface turbulent heat flux in the US Southern Great Plains." Journal of Geophysical Research: Atmospheres, , 10.1029/2019JD032255. ONLINE.
Research Highlight

Hamada Y, A Ayers, R Matamala, and D Cook. 2020. Atmosphere-Biosphere Interaction Study Field Campaign Report. Ed. by Robert Stafford, ARM user facility. DOE/SC-ARM-20-004.

Qiu S and I Williams. 2020. "Observational evidence of state‐dependent positive and negative land‐surface feedback on afternoon deep convection over the Southern Great Plains." Geophysical Research Letters, 47(5), e2019GL06622, 10.1029/2019GL086622.
Research Highlight

Lubin D, D Zhang, I Silber, R Scott, P Kalogeras, A Battaglia, D Bromwich, M Cadeddu, E Eloranta, A Fridlind, A Frossard, K Hines, S Kneifel, W Leaitch, W Lin, J Nicolas, H Powers, P Quinn, P Rowe, L Russell, S Sharma, J Verlinde, and A Vogelmann. 2020. "AWARE: The Atmospheric Radiation Measurement (ARM) West Antarctic Radiation Experiment." Bulletin of the American Meteorological Society, , 10.1175/BAMS-D-18-0278.1. ONLINE.

Gustafson W, A Vogelmann, Z Li, X Cheng, K Dumas, S Endo, K Johnson, B Krishna, T Toto, and H Xiao. 2020. "The Large-Eddy Simulation (LES) Atmospheric Radiation Measurement (ARM) Symbiotic Simulation and Observation (LASSO) Activity for Continental Shallow Convection." Bulletin of the American Meteorological Society, 101(4), 10.1175/BAMS-D-19-0065.1.
Research Highlight

Cook DR and RC Sullivan. 2020. Eddy Correlation Flux Measurement System (ECOR) Instrument Handbook. Ed. by Robert Stafford, U.S. Department of Energy. DOE/SC-ARM/TR-052.

2019

Lareau N. 2019. "Subcloud and Cloud-Base Latent Heat Fluxes during Shallow Cumulus Convection." Journal of the Atmospheric Sciences, 77(3), 10.1175/JAS-D-19-0122.1.
Research Highlight

Yang Z, Y Qian, Y Liu, L Berg, H Hu, F Dominguez, B Yang, Z Feng, W Gustafson, M Huang, and Q Tang. 2019. "Irrigation Impact on Water and Energy Cycle during Dry Years over the United States Using Convection‐Permitting WRF and a Dynamical Recycling Model." Journal of Geophysical Research: Atmospheres, 124(21), 10.1029/2019JD030524.
Research Highlight

Varble A, S Nesbitt, P Salio, E Avila, P Borque, P DeMott, G McFarquhar, S van den Heever, E Zipser, D Gochis, R Houze, M Jensen, P Kollias, S Kreidenweis, R Leung, K Rasmussen, D Romps, and C Williams. 2019. Cloud, Aerosol, and Complex Terrain Interactions (CACTI) Field Campaign Report. Ed. by Robert Stafford, ARM user facility. DOE/SC-ARM-19-028.

Osman M, D Turner, T Heus, and V Wulfmeyer. 2019. "Validating the Water Vapor Variance Similarity Relationship in the Interfacial Layer Using Observations and Large‐Eddy Simulations." Journal of Geophysical Research: Atmospheres, 124(20), 10.1029/2019JD030653.


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