1 / 15

Eddy Covariance

Eddy Covariance. John Knowles University of Colorado Department of Geography INSTAAR. www.esrl.noaa.gov. Airflow. PBL characterized by turbulent airflow Can be imagined as the horizontal flow of numerous rotating eddies Each eddy has 3D components including a vertical wind component.

zorion
Download Presentation

Eddy Covariance

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Eddy Covariance John Knowles University of Colorado Department of Geography INSTAAR

  2. www.esrl.noaa.gov

  3. Airflow • PBL characterized by turbulent airflow • Can be imagined as the horizontal flow of numerous rotating eddies • Each eddy has 3D components including a vertical wind component Burba & Anderson, 2006

  4. Infrared gas analyzer (IRGA) Sonic Anemometer

  5. FLUX • Movement per unit area per unit time Evaporation flux • mg (mol) H2O m-2 s-1 Latent Heat Flux • Wm-2

  6. Eddies at one point Each parcel of air has a particular… • trace gas concentration • temperature • humidity Burba & Anderson, 2006

  7. Latent Heat Flux Eddy Flux Vertical Flux (F) Reynolds Decomposition

  8. Footprint • ‘Field of view’ • Area which contains the sources and sinks contributing to a certain measurement point • Reflects the influence of the surface on the measured turbulent flux Burba & Anderson, 2006

  9. Inverse Gaussian plume model Schuepp et al., 1990

  10. Ecosystem scale! (m)

  11. Major Assumptions • Point measurements represent an upwind area • Footprint contains only area of interest • Flux is fully turbulent - vertical transfer done mostly by eddies

More Related