First direct measurements of formaldehyde flux via eddy covariance: implications for missing in-canopy formaldehyde sources
| Autor: | Erin S. Boyle, Samuel R. Hall, W. Zheng, Yoshihiro Nakashima, Yoshizumi Kajii, Joshua P. DiGangi, A. Turnipseed, Kirk Ullmann, Ankur R. Desai, Alex Guenther, Frank Flocke, Christopher A. Cantrell, Thomas Karl, J. B. Paul, Glenn M. Wolfe, Frank N. Keutsch, Peter Harley, R. L. Maudlin Iii, Si-Wan Kim |
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| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
Canopy
Atmospheric Science Box model gas-phase atmospheric chemistry 010504 meteorology & atmospheric sciences ponderosa pine forest Formaldehyde Eddy covariance Flux peroxy nitrates pan 010501 environmental sciences Noon simulation chamber 01 natural sciences gaseous dry deposition oh reactivity lcsh:Chemistry chemistry.chemical_compound Physical Sciences and Mathematics 0105 earth and related environmental sciences Chemistry Pine forest 15. Life on land volatile organic-compounds lcsh:QC1-999 lcsh:QD1-999 13. Climate action Atmospheric chemistry Environmental chemistry biogenic emissions lcsh:Physics carbonyl-compounds |
| Zdroj: | DiGangi, JP; Boyle, ES; Karl, T; Harley, P; Turnipseed, A; Kim, S; et al.(2011). First direct measurements of formaldehyde flux via eddy covariance: implications for missing in-canopy formaldehyde sources. ATMOSPHERIC CHEMISTRY AND PHYSICS, 11(20), 10565-10578. doi: 10.5194/acp-11-10565-2011. UC Irvine: Retrieved from: http://www.escholarship.org/uc/item/31w0g32f DiGangi, J. P; Boyle, E. S; Karl, T.; Harley, P.; Turnipseed, A.; Kim, S.; et al.(2011). First direct measurements of formaldehyde flux via eddy covariance: implications for missing in-canopy formaldehyde sources. Atmospheric Chemistry and Physics, 11(20), 10565-10578. doi: 10.5194/acp-11-10565-2011. UC Irvine: Department of Earth System Science, UCI. Retrieved from: http://www.escholarship.org/uc/item/4pm6h21j Atmospheric Chemistry and Physics, Vol 11, Iss 20, Pp 10565-10578 (2011) |
| DOI: | 10.5194/acp-11-10565-2011. |
| Popis: | 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 131 μg m−2 h−1. Enclosure experiments were performed to determine the HCHO branch (3.5 μg 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, 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. |
| Databáze: | OpenAIRE |
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