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- W4240654327 abstract "Abstract. We report the first observations of formaldehyde (HCHO) flux measured via eddy covariance, as well as HCHO concentrations and gradients, as observed by the Madison Fiber Laser-Induced Fluorescence Instrument during the BEACHON-ROCS 2010 campaign in a rural, Ponderosa Pine forest northwest of Colorado Springs, CO. A median noon upward flux of ~80 μg m−2 h−1 (~24 pptv m s−1) was observed with a noon range of 37 to 131μg m−2 h−1. Enclosure experiments were performed to determine the HCHO branch (3.5μg m−2 h−1) and soil (7.3 μg m−2 h−1) direct emission rates in the canopy. A zero-dimensional canopy box model, used to determine the apportionment of HCHO source and sink contributions to the flux, underpredicts the observed HCHO flux by a factor of 6. Simulated increases in concentrations of species similar to monoterpenes resulted in poor agreement with measurements, while simulated increases in direct HCHO emissions and/or concentrations of species similar to 2-methyl-3-buten-2-ol best improve model/measurement agreement. Given the typical diurnal variability of these BVOC emissions and direct HCHO emissions, this suggests that the source of the missing flux is a process with both a strong temperature and radiation dependence." @default.
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- W4240654327 date "2011-06-30" @default.
- W4240654327 modified "2023-09-28" @default.
- W4240654327 title "First direct measurements of formaldehyde flux via eddy covariance: implications for missing in-canopy formaldehyde sources" @default.
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- W4240654327 doi "https://doi.org/10.5194/acpd-11-18729-2011" @default.
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