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| Titel |
Biogenic volatile organic compound emissions during BEARPEX 2009 measured by eddy covariance and flux–gradient similarity methods |
| VerfasserIn |
J.-H. Park, S. Fares, R. Weber, A. H. Goldstein |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 14, no. 1 ; Nr. 14, no. 1 (2014-01-09), S.231-244 |
| Datensatznummer |
250118254
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| Publikation (Nr.) |
 copernicus.org/acp-14-231-2014.pdf |
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| Zusammenfassung |
| The Biosphere Effects on AeRosols and Photochemistry EXperiment (BEARPEX)
took place in Blodgett Forest, a Ponderosa pine forest in the Sierra Nevada
of California, USA, during summer 2009. We deployed a proton transfer reaction–quadrupole mass spectrometer (PTR-QMS) to measure fluxes and
concentrations of biogenic volatile organic compounds (BVOCs). Eighteen ion
species, including the major BVOC expected at the site, were measured
sequentially at 5 heights to observe their vertical gradient from the forest
floor to above the canopy. Fluxes of the 3 dominant BVOCs methanol,
2-Methyl-3-butene-2-ol (MBO), and monoterpenes were measured above the
canopy by the disjunct eddy covariance (EC) method. Canopy-scale fluxes were
also determined by the flux–gradient similarity method (K-theory). A
universal K (Kuniv) was determined as the mean of individual
K's calculated from the measured fluxes divided by vertical gradients for
methanol, MBO, and monoterpenes. This Kuniv was then multiplied
by the gradients of each observed ion species to compute their fluxes. The
flux–gradient similarity method showed very good agreement with the disjunct
EC method. Fluxes are presented for all measured species and compared to
historical measurements from the same site, and used to test emission
algorithms used to model fluxes at the regional scale. MBO was the dominant
emission observed, followed by methanol, monoterpenes, acetone, and
acetaldehyde. The flux–gradient similarity method is shown to be tenable, and
we recommend its use, especially in experimental conditions when fast
measurement of BVOC species is not available. |
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