Within any roughness sublayer, and especially in canopy sublayers, turbulent exchange of sensible heat and momentum are spatially highly variable. Their measurement by a one point eddy correlation instrument is not possible. Extensive arrays are needed in order to retain a statistically representative average.
		In the trunk space of the plantation, an array of 8 sonics was deployed and operaded during three days.
		Some of the sonics operated in the canopy also provide CO2 and H2O flux measurements.
		Scintillometry on the other hand provides already area averaged fluxes, but its applicability in this environment is in doubt, because calculation algorithms rely on surface layer scaling. The experiment adressed the comparability of in-canopy sonic measurements and scintillometry in the canopy sublayer. < BACK

2004 Photos by Andreas Christen, Institute of Meteorology, Climatology and Remote Sensing, University of Basel