期刊
ATMOSPHERIC CHEMISTRY AND PHYSICS
卷 11, 期 20, 页码 10565-10578出版社
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/acp-11-10565-2011
关键词
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资金
- National Science Foundation [ATM 0852406]
- NCAR BEACHON
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 similar to 80 mu g m(-2) h(-1) (similar to 24 ppt(v) m s(-1)) was observed with a noon range of 37 to 131 mu g m(-2) h(-1). Enclosure experiments were performed to determine the HCHO branch (3.5 mu g m(-2) h(-1)) and soil (7.3 mu g 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, underpredicted 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 improved 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.
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