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

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Presentation transcript:

Eddy Covariance John Knowles University of Colorado Department of Geography INSTAAR

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

Sonic Anemometer Infrared gas analyzer (IRGA)

FLUX Movement per unit area per unit time Evaporation flux mg (mol) H 2 O m -2 s -1 Latent Heat Flux Wm -2

Eddies at one point Each parcel of air has a particular… 1.trace gas concentration 2.temperature 3.humidity Burba & Anderson, 2006

Vertical Flux (F) Latent Heat FluxEddy Flux Reynolds Decomposition

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

Inverse Gaussian plume model Schuepp et al., 1990

Ecosystem scale! (m)

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

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