Extended Abstract (1.1M)J2.3
Measuring in-canopy advection of carbon dioxide using a new transect measurement system (TRAM)
Steven P. Oncley, NCAR, Boulder, CO; and K. Schwenz, J. Sun, and R. Monson
An imbalance often is seen over forests between estimates of net ecosystem exchange (NEE) of carbon from above-canopy eddy-correlation flux measurements and other methods. One hypothesis is that nocturnal emission of carbon dioxide from soils preferentially builds up in low-lying
areas and drains to locations not sampled by the above-canopy sensors. To investigate this hypothesis, we developed an instrument platform that carries a carbon dioxide sensor and a sonic anemometer along a path through a forest canopy. The platform operates like a toy electric train, with a motorized set of wheels driving along a track. The track consists of a sequence of cables suspended from towers that forms a closed circuit. We show results from the first use of this system along a 220m transect sampling at the bottom and middle of the canopy at the University of Colorado's
Flux Facility CUFF in an alpine forest at Niwot Ridge.
Joint Session 2, Canopy Turbulence-ATMOSPHERE Interactions
Wednesday, 30 April 2008, 1:30 PM-4:00 PM, Floral Ballroom Jasmine
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