A Brief Practical Guide to Eddy Covariance Flux by George Burba, Dan Anderson

By George Burba, Dan Anderson

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Extra resources for A Brief Practical Guide to Eddy Covariance Flux Measurements: Principles and Workflow Examples for Scientific and Industrial Applications

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6. When the instrument completes the zero operation, a dialog box will open. You must choose either to apply the new calibration value or revert to the previous calibration value. Span setting: Span setting is essentially the same as a zero, except that you must flow the span gas through the optical path and enter the span gas concentration in parts per million (ppm). Once that is done and the span gas concentration is stable, click the Span CH4 button. The instrument response will be similar to that for setting the zero.

Higher above the ground large eddies transfer most of the flux. Small eddies rotate at very high frequencies, and large eddies rotate slowly. They should not average small eddies by using large sensing volumes, and should be practical in terms of maintenance, power consumption and weight. For these reasons, good instruments to use for Eddy Covariance need to be “universal”. They need to sample fast enough to cover all required frequency ranges, but at the same time they need to be very sensitive to small changes in quantities.

Vibration can be minimized through appropriate compensating and mounting attachments. It is important to know that the LI-7500A is vibration sensitive at frequencies of 152 Hz ± the bandwidth. Thus, if the bandwidth is 10Hz, the problematic frequency range will be 142 to 162 Hz (and upper harmonics). The instrument is nearly completely insensitive to vibrations slower than this, and only very slightly sensitive to vibrations higher than this. Additional information, updates and downloadable software can be found at the LI-COR LI-7500A website: !

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