Comparison of Eddy Covariance Results By Wendy Couch, Rob Aves and Larissa Reames.

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Presentation transcript:

Comparison of Eddy Covariance Results By Wendy Couch, Rob Aves and Larissa Reames

Comparison of Eddy Covariance Results Group A3A4 (m 2 s -2 ) (Kms -1 ) U * (ms -1 ) Z 0 (m) τ (N m- 2 ) H (Wm - 2 ) σ u /Ū R uw

Graph of Wind speed Vs Time

Graph of Temperature Vs Time

Interpretation of Results Low values of Friction Velocity (U * ) indicate a low impedance of mean flow due to turbulence. Little effects of small scale turbulence. (U’W’) Capacity of air to transport heat is low because the eddies are small. (T’W’) Low intensity of turbulent eddies/gusts ( σ u /Ū). Low surface momentum flux due to small weak eddies ( τ ) The sensible heat flux (H) value is low due to moisture content of the surface and weather conditions during the IOP. Roughness Length (Z 0 ) higher than expected. Low effect on momentum diffusion via turbulence ( R uw ).

Differences Between Results Generally small deviations between the two sets of results. Siting of the masts Different instrument errors Small eddies affecting masts individually Few seconds difference in starting times

Assumptions Made Flux in the surface layer is constant with height. Averages are appropriate for parameters calculated. (i.e. large range of H values both positive and negative)

Instrumental Effects/Problems Time response of instruments Threshold velocity of anemometers (instrument stalling) Possible fluctuations between sampling points