First direct measurements of formaldehyde flux via eddy covariance: implications for missing in-canopy formaldehyde sources

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dc.contributor.authorDiGangi, J. P.
dc.contributor.authorBoyle, E. S.
dc.contributor.authorKarl, T.
dc.contributor.authorHarley, P.
dc.contributor.authorTurnipseed, A.
dc.contributor.authorKim, S.
dc.contributor.authorCantrell, C.
dc.contributor.authorMaudlin III, R. L.
dc.contributor.authorZheng, W.
dc.contributor.authorFlocke, F.
dc.contributor.authorHall, S. R.
dc.contributor.authorUllmann, K.
dc.contributor.authorNakashima, Y.
dc.contributor.authorPaul, J. B.
dc.contributor.authorWolfe, G. M.
dc.contributor.authorDesai, A. R.
dc.contributor.authorKajii, Y.
dc.contributor.authorGuenther, A.
dc.contributor.authorKeutsch, F. N.
dc.date.accessioned2020-09-16T15:46:19Z
dc.date.available2020-09-16T15:46:19Z
dc.date.issued2011-10-26
dc.description.abstractWe 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.en_US
dc.description.sponsorshipThe authors thank the National Science Foundation (ATM 0852406) and the NCAR BEACHON project for support. We also thank the United States Forest Service, specifically Richard Oakes, for logistical support, Melinda Beaver, John Crounse, and Paul Wennberg for performing the permeation tube calibration, and Alan Fried for useful discussions on calibration and zeroing techniques. NCAR is sponsored by the National Science Foundation.en_US
dc.description.urihttps://acp.copernicus.org/articles/11/10565/2011/en_US
dc.format.extent14 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2str9-nbpy
dc.identifier.citationDiGangi, J. P., Boyle, E. S., Karl, T., Harley, P., Turnipseed, A., Kim, S., Cantrell, C., Maudlin III, R. L., Zheng, W., Flocke, F., Hall, S. R., Ullmann, K., Nakashima, Y., Paul, J. B., Wolfe, G. M., Desai, A. R., Kajii, Y., Guenther, A., and Keutsch, F. N.: First direct measurements of formaldehyde flux via eddy covariance: implications for missing in-canopy formaldehyde sources, Atmos. Chem. Phys., 11, 10565–10578, https://doi.org/10.5194/acp-11-10565-2011, 2011.en_US
dc.identifier.urihttps://doi.org/10.5194/acp-11-10565-2011
dc.identifier.urihttp://hdl.handle.net/11603/19660
dc.language.isoen_USen_US
dc.publisherCopernicusen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Joint Center for Earth Systems Technology
dc.relation.ispartofUMBC Physics Department
dc.rightsThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.
dc.rightsAttribution 3.0 Unported*
dc.rights.urihttps://creativecommons.org/licenses/by/3.0/*
dc.titleFirst direct measurements of formaldehyde flux via eddy covariance: implications for missing in-canopy formaldehyde sourcesen_US
dc.typeTexten_US

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