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A Disjunct Eddy Accumulation System for the Measurement of Bvoc Fluxes: Instrument Characterizations and Field Deployment : Volume 5, Issue 2 (04/04/2012)

By Edwards, G. D.

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Book Id: WPLBN0003974592
Format Type: PDF Article :
File Size: Pages 44
Reproduction Date: 2015

Title: A Disjunct Eddy Accumulation System for the Measurement of Bvoc Fluxes: Instrument Characterizations and Field Deployment : Volume 5, Issue 2 (04/04/2012)  
Author: Edwards, G. D.
Volume: Vol. 5, Issue 2
Language: English
Subject: Science, Atmospheric, Measurement
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2012
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Shepson, P. B., Edwards, G. D., Pratt, K., Martins, D. K., & Starn, T. (2012). A Disjunct Eddy Accumulation System for the Measurement of Bvoc Fluxes: Instrument Characterizations and Field Deployment : Volume 5, Issue 2 (04/04/2012). Retrieved from http://www.ebooklibrary.org/


Description
Description: Department of Chemistry, Eastern Michigan University, Ypsilanti, MI 48197, USA. Biological volatile organic compounds (BVOCs), such as isoprene and monoterpenes, are emitted in large amounts from forests. Quantification of the flux of BVOCs is critical in the evaluation of the impact of these compounds on the concentrations of atmospheric oxidants and on the production of secondary organic aerosol. A disjunct eddy accumulation (DEA) sampler system was constructed for the measurement of speciated BVOC fluxes. Unlike traditional eddy covariance (EC), the relatively new technique of disjunct sampling differs by taking short, discrete samples that allows for slower sampling frequencies. Disjunct sample airflow is directed into cartridges containing sorbent materials at sampling rates proportional to the magnitude of the vertical wind. Compounds accumulated on the cartridges are then quantified by thermal desorption and gas chromatography. Herein, we describe our initial tests to evaluate the disjunct sampler including the application of using vertical wind measurements to create optimized sampling thresholds. Measurements of BVOC fluxes obtained from DEA during its deployment above a mixed hardwood forest at the University of Michigan Biological Station (Pellston, MI) during the 2009 CABINEX field campaign are reported. Daytime (09:00 a.m. to 05:00 p.m.) isoprene fluxes, when averaged over the footprint of the tower were 1.31 mg m−2 h−1 which is comparable to previous flux measurements at this location. Speciated monoterpene fluxes are some of the first to be reported from this site. Daytime averages were 26.7 Μg m−2 h−1 for Α-pinene and 10.6 Μg m−2 h−1 for Β-pinene. These measured concentrations and fluxes were compared to the output of an atmospheric chemistry model, and were found to be consistent with our knowledge of the variables that control BVOCs fluxes at this site.

Summary
A disjunct eddy accumulation system for the measurement of BVOC fluxes: instrument characterizations and field deployment

Excerpt
Andreae, M. O. and Crutzen, P. J.: Atmospheric aerosols: biogeochemical sources and role in atmospheric chemistry, Science, 76, 1052–1058, 1997.; Arneth, A., Monson, R. K., Schurgers, G., Niinemets, Ü., and Palmer, P. I.: Why are estimates of global terrestrial isoprene emissions so similar (and why is this not so for monoterpenes)?, Atmos. Chem. Phys., 8, 4605–4620, doi:10.5194/acp-8-4605-2008, 2008.; Ammann, C. and Meixner, F. X.: Stability dependence of the relaxed eddy accumulation coefficient for various scalar quantities, J. Geophys. Res., 107, 4071, doi:10.1029/2001JD000649, 2002.; Apel, E. C., Riemer, D. D., Hills, A., Baugh, W., Orlando, J., Faloona, I., Tan, D., Brune, W., Lamb, B., Westberg, H., Carroll, M. A., Thornberry, T., and Geron, C. D.: Measurement and interpretation of isoprene fluxes and isoprene, methacrolein, and methyl vinyl ketone mixing ratios at the PROPHET site during the 1998 intensive, J. Geophys Res., 107, 4034, doi:10.1029/2000JD000225 2002.; Atkinson, R., Baulch, D. L., Cox, R. A., Hampson, R. F., Kerr, J. A., Rossi, M. J., and Troe, J.: Evaluated kinetic, photochemical and heterogeneous data for atmospheric chemistry. IUPAC subcommittee on gas kinetic data evaluation for atmospheric chemistry, J. Phys. Chem. Chem. Ref., 26, 1329, doi:10.1063/1.556048, 1997.; Baldocchi, D., Guenther, A., Harley, P., Klinger, L., Zimmerman, P., Lamb, B., and Westberg, H.: The fluxes and air chemistry of isoprene above a deciduous hardwood forest, Philos. Trans. Roy. Soc., 351, 279–296, 1995.; Barket, D. J., Hurst, J. M., Couch, T. L., Colorado, A., Shepson, P. B., Riemer, D. D., Hills, A. J., Apel, E. C., Hafer, R., Lamb, B. K., Westberg, H. H., Farmer, C. T., Stabenau, E. R., and Zika, R. G.: Intercomparison of automated methodologies for determination of ambient isoprene during the PROPHET 1998 summer campaign, J. Geophys Res., 106, 24301, doi:10.1029/2000JD900562, 2001.; Biesenthal, T. A., Wu, Q., Shepson, P. B., Wiebe, H. A., Anlauf, K., and Mackays, K.: Observations of anthropogenic inputs of the isoprene oxidation products methyl vinyl ketone and methacrolein to the atmosphere, Atmos. Environ., 31, 2049, doi:10.1029/97GL01337, 1997.; Bertman, S. B., Caroll, M. A., Stevens, P., and Shepson, P. B.: Overview of the combined atmosphere-biosphere intensive experiment CABINEX, in preparation, 2012.; Bergen, K. M. and Dronova, I.: Observing succession on aspen-dominated landscapes using a remote sensing-ecosystem approach, Landscape Ecol., 22, 1395–1410, 2007.; Bowling, D. R., Delany, A. C., Turnipseed, A. A., Baldocchi, D. D., and Monson, R. K.: Modification of the relaxed eddy accumulation techniq

 

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