Comparison of different real time VOC measurement techniques in a ponderosa pine forest

被引:65
|
作者
Kaser, L. [1 ]
Karl, T. [2 ]
Schnitzhofer, R. [1 ]
Graus, M. [3 ,4 ]
Herdlinger-Blatt, I. S. [1 ]
DiGangi, J. P. [5 ]
Sive, B. [6 ,7 ]
Turnipseed, A. [2 ]
Hornbrook, R. S. [2 ]
Zheng, W. [2 ]
Flocke, F. M. [2 ]
Guenther, A. [2 ]
Keutsch, F. N. [5 ]
Apel, E. [2 ]
Hansel, A. [1 ]
机构
[1] Univ Innsbruck, Inst Ion Phys & Appl Phys, A-6020 Innsbruck, Austria
[2] Natl Ctr Atmospher Res, Div Atmospher Chem, Boulder, CO 80307 USA
[3] NOAA, Div Chem Sci, Earth Syst Res Lab, Boulder, CO USA
[4] Univ Colorado, CIRES, Boulder, CO 80309 USA
[5] Univ Wisconsin, Dept Chem, Madison, WI 53706 USA
[6] Appalachian State Univ, Dept Chem, Boone, NC 28608 USA
[7] Appalachian State Univ, Environm Sci Program, Boone, NC 28608 USA
基金
奥地利科学基金会; 美国农业部; 美国国家科学基金会;
关键词
VOLATILE ORGANIC-COMPOUNDS; PROTON-TRANSFER-REACTION; METHYL VINYL KETONE; SPECTROMETRY PTR-MS; MASS-SPECTROMETRY; FORMALDEHYDE MEASUREMENTS; FLUX MEASUREMENTS; 2-METHYL-3-BUTEN-2-OL; EMISSIONS; ISOPRENE;
D O I
10.5194/acp-13-2893-2013
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Volatile organic compound (VOC) mixing ratios measured by five independent instruments are compared at a forested site dominated by ponderosa pine (Pinus Ponderosa) during the BEACHON-ROCS field study in summer 2010. The instruments included a Proton Transfer Reaction Time of Flight Mass Spectrometer (PTR-TOF-MS), a Proton Transfer Reaction Quadrupole Mass Spectrometer (PTR-MS), a Fast Online Gas-Chromatograph coupled to a Mass Spectrometer (GC/MS; TOGA), a Thermal Dissociation Chemical Ionization Mass Spectrometer (PAN-CIMS) and a Fiber Laser-Induced Fluorescence Instrument (FILIF). The species discussed in this comparison include the most important biogenic VOCs and a selected suite of oxygenated VOCs that are thought to dominate the VOC reactivity at this particular site as well as typical anthropogenic VOCs that showed low mixing ratios at this site. Good agreement was observed for methanol, the sum of the oxygenated hemiterpene 2-methyl-3-buten-2-ol (MBO) and the hemiterpene isoprene, acetaldehyde, the sum of acetone and propanal, benzene and the sum of methyl ethyl ketone (MEK) and butanal. Measurements of the above VOCs conducted by different instruments agree within 20 %. The ability to differentiate the presence of toluene and cymene by PTR-TOF-MS is tested based on a comparison with GC-MS measurements, suggesting a study-average relative contribution of 74% for toluene and 26% for cymene. Similarly, 2-hydroxy-2-methylpropanal (HMPR) is found to interfere with the sum of methyl vinyl ketone and methacrolein (MVK + MAC) using PTR-(TOF)-MS at this site. A study-average relative contribution of 85% for MVK+ MAC and 15% for HMPR was determined. The sum of monoterpenes measured by PTR-MS and PTR-TOF-MS was generally 20-25% higher than the sum of speciated monoterpenes measured by TOGA, which included alpha-pinene, beta-pinene, camphene, carene, myrcene, limonene, cineole as well as other terpenes. However, this difference is consistent throughout the study, and likely points to an offset in calibration, rather than a difference in the ability to measure the sum of terpenes. The contribution of isoprene relative to MBO inferred from PTR-MS and PTR-TOF-MS was smaller than 12% while GC-MS data suggested an average of 21% of isoprene relative to MBO. This comparison demonstrates that the current capability of VOC measurements to account for OH reactivity associated with the measured VOCs is within 20 %.
引用
收藏
页码:2893 / 2906
页数:14
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