LI-COR LI7200RS, Instruction Manual

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Note: We suggest setting the CO
2
/H
2
O analyzer bandwidth at 1/2 of the logging
update rate. Thus, if you are sampling at 10 Hz, the bandwidth should be set to 5
Hz. 5 Hz is the default setting for bandwidth.
Entering the Site Description
The
Site Description
tab is used to enter information about the site. This inform-
ation configures the metadata file that is used for flux processing.
Site name:
Name of the research site (e.g., Marsh).
Station name:
Name of the flux stations within the site.
Canopy height (mandatory) :
Site canopy height; meters.
Displacement height:
Also referred to as zero plane displacement height, the dis-
placement height of a vegetated surface (usually designated d ) is the height at
which the wind speed would go to zero if the logarithmic wind profile was main-
tained from the outer flow all the way down to the surface (that is, in the absence
of vegetation). In other words, it is the distance over the ground at which a non-
vegetated surface should be placed to provide a logarithmic wind field equal to the
observed one. For forest canopies, the displacement height is estimated to vary
between 0.6 and 0.8 times the height of the canopy. If not entered explicitly,
EddyPro computes displacement height as:
3-1 d = 0.67 x canopy height
Section 3. Operation
3-21 Entering the Site Description