<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE article PUBLIC "-//NLM//DTD Journal Publishing DTD v3.0 20080202//EN" "http://dtd.nlm.nih.gov/publishing/3.0/journalpublishing3.dtd">
<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" article-type="research-article" dtd-version="3.0" xml:lang="en">
<front>
<journal-meta>
<journal-id journal-id-type="publisher">ACP</journal-id>
<journal-title-group>
<journal-title>Atmospheric Chemistry and Physics</journal-title>
<abbrev-journal-title abbrev-type="publisher">ACP</abbrev-journal-title>
</journal-title-group>
<issn pub-type="epub">1680-7324</issn>
<publisher><publisher-name>Copernicus GmbH</publisher-name>
<publisher-loc>Göttingen, Germany</publisher-loc>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="doi">10.5194/acp-12-125-2012</article-id>
<title-group>
<article-title>Chemical characterisation of atmospheric aerosols during a 2007 summer field campaign at Brasschaat, Belgium: sources and source processes of biogenic secondary organic aerosol</article-title>
</title-group>
<contrib-group><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Gómez-González</surname>
<given-names>Y.</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Wang</surname>
<given-names>W.</given-names>
</name>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Vermeylen</surname>
<given-names>R.</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Chi</surname>
<given-names>X.</given-names>
</name>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
<xref ref-type="aff" rid="aff5">
<sup>5</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Neirynck</surname>
<given-names>J.</given-names>
</name>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Janssens</surname>
<given-names>I. A.</given-names>
</name>
<xref ref-type="aff" rid="aff4">
<sup>4</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Maenhaut</surname>
<given-names>W.</given-names>
</name>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Claeys</surname>
<given-names>M.</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
</contrib>
</contrib-group><aff id="aff1">
<label>1</label>
<addr-line>Department of Pharmaceutical Sciences, University of Antwerp (Campus Drie Eiken), Antwerp, Belgium</addr-line>
</aff>
<aff id="aff2">
<label>2</label>
<addr-line>Department of Analytical Chemistry, Institute for Nuclear Sciences, Ghent University, Gent, Belgium</addr-line>
</aff>
<aff id="aff3">
<label>3</label>
<addr-line>Research Institute for Nature and Forest (INBO), Geraardsbergen, Belgium</addr-line>
</aff>
<aff id="aff4">
<label>4</label>
<addr-line>Department of Biology, University of Antwerp (Campus Drie Eiken), Antwerp, Belgium</addr-line>
</aff>
<aff id="aff5">
<label>5</label>
<addr-line>present address: Biogeochemistry Department, Max Planck Institute for Chemistry, Mainz, Germany</addr-line>
</aff>
<pub-date pub-type="epub">
<day>02</day>
<month>01</month>
<year>2012</year>
</pub-date>
<volume>12</volume>
<issue>1</issue>
<fpage>125</fpage>
<lpage>138</lpage>
<permissions>
<license xlink:type="simple">
<license-p>This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.</license-p>
</license>
</permissions>
<self-uri xlink:href="http://www.atmos-chem-phys.net/12/125/2012/acp-12-125-2012.html">This article is available from http://www.atmos-chem-phys.net/12/125/2012/acp-12-125-2012.html</self-uri>
<self-uri xlink:href="http://www.atmos-chem-phys.net/12/125/2012/acp-12-125-2012.pdf">The full text article is available as a PDF file from http://www.atmos-chem-phys.net/12/125/2012/acp-12-125-2012.pdf</self-uri>
<abstract>
<p>Measurements of organic marker compounds and inorganic species were
performed on PM&lt;sub&gt;2.5&lt;/sub&gt; aerosols from a Belgian forest site that is severely
impacted by urban pollution (&quot;De Inslag&quot;, Brasschaat, Belgium) during a
2007 summer period within the framework of the &quot;Formation mechanisms,
marker compounds, and source apportionment for biogenic atmospheric aerosols
(BIOSOL)&quot; project. The measured organic species included (i) low-molecular
weight (MW) dicarboxylic acids (LMW DCAs), (ii) methanesulfonate (MSA),
(iii) terpenoic acids originating from the oxidation of α-pinene,
&amp;beta;-pinene, &lt;i&gt;d&lt;/i&gt;-limonene and &amp;Delta;&lt;sup&gt;3&lt;/sup&gt;-carene, and (iv)
organosulfates related to secondary organic aerosol from the oxidation of
isoprene and &amp;alpha;-pinene. The organic tracers explained, on average,
5.3 % of the organic carbon (OC), of which 0.7 % was due to MSA, 3.4 %
to LMW DCAs, 0.6 % to organosulfates, and 0.6 % to terpenoic acids. The
highest atmospheric concentrations of most species were observed during the
first five days of the campaign, which were characterised by maximum
day-time temperatures &gt;22 °C. Most of the terpenoic acids and the
organosulfates peaked during day-time, consistent with their local
photochemical origin. High concentrations of
3-methyl-1,2,3-butanetricarboxylic acid (MBTCA) and low concentrations of
&lt;i&gt;cis&lt;/i&gt;-pinonic acid were noted during the first five days of the campaign,
indicative of an aged biogenic aerosol. Several correlations between organic
species were very high (&lt;i&gt;r&lt;/i&gt;&gt;0.85), high (0.7&lt;&lt;i&gt;r&lt;/i&gt;&lt;0.85), or substantial
(0.5&lt;&lt;i&gt;r&lt;/i&gt;&lt;0.7), suggesting that they are generated through similar
formation pathways. Substantial correlations with temperature were found for
OC, water-soluble OC, MBTCA, and several other organic species. MBTCA and
terebic acid were highly correlated with the temperature (&lt;i&gt;r&lt;/i&gt;&gt;0.7) and
showed an Arrhenius-type relationship, consistent with their formation
through OH radical chemistry.</p>
</abstract>
<counts><page-count count="14"/></counts>
</article-meta>
</front>
<body/>
<back>
<ref-list>
<title>References</title>
<ref id="ref1">
<label>1</label><mixed-citation publication-type="other" xlink:type="simple"> Aschmann, S. M., Reissell, A., Atkinson, R., and Arey, J.: Products of the gas phase reactions of the OH radical with alpha- and beta-pinene in the presence of NO, J. Geophys. Res.-Atmos., 103, 25553–25561, 1998. </mixed-citation>
</ref>
<ref id="ref2">
<label>2</label><mixed-citation publication-type="other" xlink:type="simple"> Birch, M. E. and Cary, R. A.: Elemental carbon-based method for monitoring occupational exposures to particulate diesel exhaust, Aerosol Sci. Technol., 25, 221–241, 1996. </mixed-citation>
</ref>
<ref id="ref3">
<label>3</label><mixed-citation publication-type="other" xlink:type="simple"> Chebbi, A. and Carlier, P.: Carboxylic acids in the troposphere, occurrence, sources, and sinks: a review, Atmos. Environ., 30, 4233–4249, 1996. </mixed-citation>
</ref>
<ref id="ref4">
<label>4</label><mixed-citation publication-type="other" xlink:type="simple"> Chi, X.: Development of Improved Sampling and Analysis Methods for Measuring Organic, Elemental, and Water-soluble Organic Carbon in Atmospheric Aerosols and Application to Aerosol Studies in Europe and Tropical/equatorial and Oceanic Regions, PhD thesis, Ghent University, ISBN:978-90-5989-328-3, 440 pp., 2009. </mixed-citation>
</ref>
<ref id="ref5">
<label>5</label><mixed-citation publication-type="other" xlink:type="simple"> Claeys, M., Iinuma, Y., Szmigielski, R., Surratt, J. D., Blockhuys, F., Van Alsenoy, C., Böge, O., Sierau, B., Gómez-González, Y., Vermeylen, R., Van der Veken, P., Shahgholi, M., Chan, A. W. H., Herrmann, H., Seinfeld, J. H., and Maenhaut, W.: Terpenylic acid and related compounds from the oxidation of α-pinene: Implications for new particle formation and growth above forest, Environ. Sci. Technol., 43, 6976–6982, 2009. </mixed-citation>
</ref>
<ref id="ref6">
<label>6</label><mixed-citation publication-type="other" xlink:type="simple"> Claeys, M., Wang, W., Vermeylen, R., Kourtchev, I., Chi, X., Yasmeen, F., Surratt, J. D., Gómez-González, Y., Sciare, J., and Maenhaut, W.: Chemical characterisation of marine aerosol at Amsterdam Island during the austral summer of 2006–2007, J. Aerosol Sci., 41, 13–22, 2010. </mixed-citation>
</ref>
<ref id="ref7">
<label>7</label><mixed-citation publication-type="other" xlink:type="simple"> Davidson, E. A. and Janssens, I. A.: Temperature sensitivity of soil carbon decomposition and feedbacks to climate change, Nature, 440, 165–173, 2006. </mixed-citation>
</ref>
<ref id="ref8">
<label>8</label><mixed-citation publication-type="other" xlink:type="simple"> Decesari, S., Fuzzi, S., Facchini, M. C., Mircea, M., Emblico, L., Cavalli, F., Maenhaut, W., Chi, X., Schkolnik, G., Falkovich, A., Rudich, Y., Claeys, M., Pashynska, V., Vas, G., Kourtchev, I., Vermeylen, R., Hoffer, A., Andreae, M. O., Tagliavini, E., Moretti, F., and Artaxo, P.: Characterization of the organic composition of aerosols from Rondônia, Brazil, during the LBA-SMOCC 2002 experiment and its representation through model compounds, Atmos. Chem. Phys., 6, 375–402, http://dx.doi.org/10.5194/acp-6-375-2006doi:10.5194/acp-6-375-2006, 2006. </mixed-citation>
</ref>
<ref id="ref9">
<label>9</label><mixed-citation publication-type="other" xlink:type="simple"> Fisseha, R., Dommen, J., Sax, M., Paulsen, D., Kalberer, M., Maurer, R., Hofler, F., Weingartner, E., and Baltensperger, U.: Identification of organic acids in secondary organic aerosol and the corresponding gas phase from chamber experiments, Anal. Chem., 76, 6535–6540, 2004. </mixed-citation>
</ref>
<ref id="ref10">
<label>10</label><mixed-citation publication-type="other" xlink:type="simple"> Glasius, M., Duane, M., and Larsen, B. R.: Determination of polar terpene oxidation products in aerosols by liquid chromatography–ion trap mass spectrometry, J. Chrom. A, 833, 121–135, 1999. </mixed-citation>
</ref>
<ref id="ref11">
<label>11</label><mixed-citation publication-type="other" xlink:type="simple"> Gómez-González, Y., Surratt, J. D., Cuyckens, F., Szmigielski, R., Vermeylen, R., Jaoui, M., Lewandowski, M., Offenberg, J. H., Kleindienst, T. E., Edney, E. O., Blockhuys, F., Van Alsenoy, C., Maenhaut, W., and Claeys, M.: Characterization of organosulfates from the photooxidation of isoprene and unsaturated fatty acids in ambient aerosol using liquid chromatography/(-)electrospray ionization mass spectrometry, J. Mass Spectrom., 43, 371–382, 2008. </mixed-citation>
</ref>
<ref id="ref12">
<label>12</label><mixed-citation publication-type="other" xlink:type="simple"> Hallquist, M., Wenger, J. C., Baltensperger, U., Rudich, Y., Simpson, D., Claeys, M., Dommen, J., Donahue, N. M., George, C., Goldstein, A. H., Hamilton, J. F., Herrmann, H., Hoffmann, T., Iinuma, Y., Jang, M., Jenkin, M. E., Jimenez, J. L., Kiendler-Scharr, A., Maenhaut, W., McFiggans, G., Mentel, Th. F., Monod, A., Prévôt, A. S. H., Seinfeld, J. H., Surratt, J. D., Szmigielski, R., and Wildt, J.: The formation, properties and impact of secondary organic aerosol: current and emerging issues, Atmos. Chem. Phys., 9, 5155–5236, http://dx.doi.org/10.5194/acp-9-5155-2009doi:10.5194/acp-9-5155-2009, 2009. </mixed-citation>
</ref>
<ref id="ref13">
<label>13</label><mixed-citation publication-type="other" xlink:type="simple"> Harman, H. H.: Modern Factor Analysis, 3rd ed., rev., University of Chicago Press, Chicago, Ill., USA, 1976. </mixed-citation>
</ref>
<ref id="ref14">
<label>14</label><mixed-citation publication-type="other" xlink:type="simple"> Hoffmann, T., Bandur, R., Marggraf, U., and Linscheid, M.: Molecular composition of organic aerosols formed in the $\alpha $-pinene/O&lt;sub&gt;3&lt;/sub&gt; reaction: Implications for new particle formation processes, J. Geophys. Res., 103, 25569–25578, 1998. </mixed-citation>
</ref>
<ref id="ref15">
<label>15</label><mixed-citation publication-type="other" xlink:type="simple"> Iinuma, Y., Müller, C., Böge, O., Gnauk, T., and Herrmann, H.: The formation of organic sulfate esters in the limonene ozonolysis secondary organic aerosol (SOA) under acidic conditions, Atmos. Environ., 41, 5571–5583, 2007a. </mixed-citation>
</ref>
<ref id="ref16">
<label>16</label><mixed-citation publication-type="other" xlink:type="simple"> Iinuma, Y., Müller, C., Berndt, T., Böge, O., Claeys, M., and Herrmann, H.: Evidence for the existence of organosulfates from $\beta $-pinene ozonolysis in ambient secondary organic aerosol, Environ. Sci. Technol., 41, 6678–6683, 2007b. </mixed-citation>
</ref>
<ref id="ref17">
<label>17</label><mixed-citation publication-type="other" xlink:type="simple"> Iinuma, Y., Böge, O., Keywood, M., Gnauk, T., and Herrrmann, H.: Diaterebic acid acetate and diaterpenylic acid acetate: Atmospheric tracers for secondary organic aerosol formation from 1,8-cineole oxidation, Environ. Sci. Technol., 43, 280–285, 2009. </mixed-citation>
</ref>
<ref id="ref18">
<label>18</label><mixed-citation publication-type="other" xlink:type="simple"> Ion, A. C., Vermeylen, R., Kourtchev, I., Cafmeyer, J., Chi, X., Gelencsér, A., Maenhaut, W., and Claeys, M.: Polar organic compounds in rural PM$_2.5$ aerosols from K-puszta, Hungary, during a 2003 summer field campaign: sources and diel variations, Atmos. Chem. Phys., 5, 1805-1814, http://dx.doi.org/10.5194/acp-5-1805-2005doi:10.5194/acp-5-1805-2005, 2005. </mixed-citation>
</ref>
<ref id="ref19">
<label>19</label><mixed-citation publication-type="other" xlink:type="simple"> Jaoui, M. and Kamens, R. M.: Mass balance of gaseous and particulate products from $\beta $-pinene/O&lt;sub&gt;3&lt;/sub&gt;/air in the absence of light and $\alpha $-pinene/NO&lt;sub&gt;x&lt;/sub&gt;/air in the presence of natural sunlight, J. Atmos. Chem., 45, 101–141, 2003. </mixed-citation>
</ref>
<ref id="ref20">
<label>20</label><mixed-citation publication-type="other" xlink:type="simple"> Kamens, R. M. and Jaoui, M.: Modeling aerosol formation from $\alpha $-pinene and NO&lt;sub&gt;x&lt;/sub&gt; in the presence of natural sunlight using gas-phase kinetics and gas-particle partitioning theory, Environ. Sci. Technol., 35, 1394–1405, 2001. </mixed-citation>
</ref>
<ref id="ref21">
<label>21</label><mixed-citation publication-type="other" xlink:type="simple"> Kourtchev, I., Ruuskanen, T., Maenhaut, W., Kulmala, M., and Claeys, M.: Observation of 2-methyltetrols and related photooxidation products of isoprene in boreal forest aerosols from Hyytiälä, Finland, Atmos. Chem. Phys., 5, 2761–2770, http://dx.doi.org/10.5194/acp-5-2761-2005doi:10.5194/acp-5-2761-2005, 2005. </mixed-citation>
</ref>
<ref id="ref22">
<label>22</label><mixed-citation publication-type="other" xlink:type="simple"> Kourtchev, I., Ruuskanen, T. M., Keronen, P., Sogacheva, L., Dal Maso, M., Reissell, A., Chi, X., Vermeylen, R., Kulmala, M., Maenhaut, W., and Claeys, M.: Determination of isoprene and $\alpha $-/$\beta $-pinene oxidation products in boreal forest aerosols from Hyytiälä, Finland: diel variations and possible link with particle formation events, Plant Biol., 10, 138–149, 2008a. </mixed-citation>
</ref>
<ref id="ref23">
<label>23</label><mixed-citation publication-type="other" xlink:type="simple"> Kourtchev, I., Warnke, J., Maenhaut, W., Hoffmann, T., and Claeys, M.: Polar organic marker compounds in PM$_2.5$ aerosol from a mixed forest site in western Germany, Chemosphere, 73, 1308–1314, 2008b. </mixed-citation>
</ref>
<ref id="ref24">
<label>24</label><mixed-citation publication-type="other" xlink:type="simple"> Kourtchev, I., Copolovici, L., Claeys, M., and Maenhaut, W.: Characterization of aerosols at a forested site in central Europe, Environ. Sci. Technol., 43, 4665–4671, 2009. </mixed-citation>
</ref>
<ref id="ref25">
<label>25</label><mixed-citation publication-type="other" xlink:type="simple"> Kourtchev, I., Hellebust, S., Bell, J. M., O&apos;Connor, I. P., Healy, R. M., Allanic, A., Healy, D., Wenger, J. C., and Sodeau, J. R.: The use of polar organic compounds to estimate the contribution of domestic solid fuel combustion and biogenic sources to ambient levels of organic carbon and PM$_2.5$ in Cork Harbour, Ireland, Sci. Tot. Environ., 409, 2143–2155, 2011. </mixed-citation>
</ref>
<ref id="ref26">
<label>26</label><mixed-citation publication-type="other" xlink:type="simple"> Kristensen, K. and Glasius, M.: Organosulfates and oxidation products from biogenic hydrocarbons in fine aerosols from a forest in North West Europe during spring, Atmos. Environ., 45, 4546–4556, 2011. </mixed-citation>
</ref>
<ref id="ref27">
<label>27</label><mixed-citation publication-type="other" xlink:type="simple"> Legrand, M., Preunkert, S., Galy-Lacaux, C., Liousse, C., and Wagenbach, D.: Atmospheric year-round records of dicarboxylic acids and sulfate at three French sites located between 630 and 4360 m elevation, J. Geophys. Res.-Atmos., 110, D13302, http://dx.doi.org/10.1029/2004JD005515doi:10.1029/2004JD005515, 2005. </mixed-citation>
</ref>
<ref id="ref28">
<label>28</label><mixed-citation publication-type="other" xlink:type="simple"> Legrand, M., Preunkert, S., Oliveira, T., Pio, C., Hammer, S., Gelencsér, A., Kasper-Giebl, A., and Laj, P.: Origin of C&lt;sub&gt;2&lt;/sub&gt;-C$_5$ dicarboxylic acids in the European atmosphere inferred from year-round aerosol study conducted at a west-east transect, J. Geophys. Res.-Atmos., 112, D23S07, http://dx.doi.org/10.1029/2006JD008019doi:10.1029/2006JD008019, 2007. </mixed-citation>
</ref>
<ref id="ref29">
<label>29</label><mixed-citation publication-type="other" xlink:type="simple"> Maenhaut, W., Wang, W., and Chi, X.: Semivolatile behaviour and filter sampling artifacts for dicarboxylic acids during summer campaigns at three forested sites in Europe, Boreal Env. Res., 16, 273–287, 2011. </mixed-citation>
</ref>
<ref id="ref30">
<label>30</label><mixed-citation publication-type="other" xlink:type="simple"> Müller, L., Reinnig, M. C., Naumann, K. H., Saathoff, H., Mentel, T. F., Donahue, N. M., and Hoffmann., T.: Formation of 3-methyl-1,2,3-butanetricarboxylic acid via gas phase oxidation of pinonic acid – a mass spectrometric study of SOA aging, Atmos. Chem. Phys. Discuss., 11, 19443–19476, http://dx.doi.org/10.5194/acp-11-19443-2011doi:10.5194/acp-11-19443-2011, 2011. </mixed-citation>
</ref>
<ref id="ref31">
<label>31</label><mixed-citation publication-type="other" xlink:type="simple"> Offenberg, J. H., Lewandowski, M., Edney, E. O., Kleindienst, T. E., and Jaoui, M.: Influence of aerosol acidity on the formation of secondary organic aerosol from biogenic precursor hydrocarbons, Environ. Sci. Technol., 43, 7742–7747, 2009. </mixed-citation>
</ref>
<ref id="ref32">
<label>32</label><mixed-citation publication-type="other" xlink:type="simple"> Parshintsev, J., Hyotylainen, T., Hartonen, K., Kulmala, M., and Riekkola, M. L.: Solid-phase extraction of organic compounds in atmospheric aerosol particles collected with the particle-into-liquid sampler and analysis by liquid chromatography-mass spectrometry, Talanta, 80, 1170–1176, 2010. </mixed-citation>
</ref>
<ref id="ref33">
<label>33</label><mixed-citation publication-type="other" xlink:type="simple"> Plewka, A., Gnauk, T., Brüggemann, E., and Herrmann, H.: Biogenic contributions to the chemical composition of airborne particles in a coniferous forest in Germany, Atmos. Environ., 40, 103–115, 2006. </mixed-citation>
</ref>
<ref id="ref34">
<label>34</label><mixed-citation publication-type="other" xlink:type="simple"> Presto, A. A., Hartz, K. E., and Donahue, N. M.: Secondary organic aerosol production from terpene ozonolysis: 1. Effect of UV radiation, Environ. Sci. Technol., 9, 7036–7045, 2005. </mixed-citation>
</ref>
<ref id="ref35">
<label>35</label><mixed-citation publication-type="other" xlink:type="simple"> Rogge, W. F., Mazurek, M. A., Hildemann, L. M., and Cass, G. R.: Quantification of urban organic aerosols at a molecular level: identification, abundance and seasonal variation, Atmos. Environ., 27A, 1309–1330, 1993. </mixed-citation>
</ref>
<ref id="ref36">
<label>36</label><mixed-citation publication-type="other" xlink:type="simple"> Saltzman, E. S., Savoie, D. L., Zika, R. G., and Prospero, J. M.: Methanesulfonic acid in the marine atmosphere, J. Geophys. Res., 88, 897–902, 1983. </mixed-citation>
</ref>
<ref id="ref37">
<label>37</label><mixed-citation publication-type="other" xlink:type="simple"> Schaap, M., Spindler, G., Schulz, M., Acker, K., Maenhaut, W., Berner, A., Wieprecht, W., Streit, N., Müller, K., Brüggemann, E., Chi, X., Putaud, J.-P., Hitzenberger, R., Puxbaum, H., Baltensperger, U., and ten Brink, H.: Artefacts in the sampling of nitrate studied in the &quot;INTERCOMP&quot; campaigns of EUROTRAC-AEROSOL, Atmos. Environ., 38, 6487–6496, 2004. </mixed-citation>
</ref>
<ref id="ref38">
<label>38</label><mixed-citation publication-type="other" xlink:type="simple"> Surratt, J. D., Kroll, J. H., Kleindienst, T. E., Edney, E. O., Claeys, M., Sorooshian, A., Ng, N. L., Offenberg, J. H., Lewandowski, M., Jaoui, M., Flagan, R. C., and Seinfeld, J. H.: Evidence for organosulfates in secondary organic aerosol, Environ. Sci. Technol., 41, 517–527, 2007a. </mixed-citation>
</ref>
<ref id="ref39">
<label>39</label><mixed-citation publication-type="other" xlink:type="simple"> Surratt, J. D., Lewandowski, M., Offenberg, J. H., Jaoui, M., Kleindienst, T. E., Edney, E. O., and Seinfeld, J. H.: Effect of acidity on secondary organic aerosol formation from isoprene, Environ. Sci. Technol., 41, 5363–5369, 2007b. </mixed-citation>
</ref>
<ref id="ref40">
<label>40</label><mixed-citation publication-type="other" xlink:type="simple"> Surratt, J. D., Gómez-González, Y., Chan, A. W. H., Vermeylen, R., Shahgholi, M., Kleindienst, T. E., Edney, E. O., Offenberg, J. H., Lewandowski, M., Jaoui, M., Maenhaut, W., Claeys, M., Flagan, R. C., and Seinfeld, J. H.: Organosulfate formation in biogenic secondary organic aerosol, J. Phys. Chem, A., 112, 8345–8378, 2008. </mixed-citation>
</ref>
<ref id="ref41">
<label>41</label><mixed-citation publication-type="other" xlink:type="simple"> Surratt, J. D., Chan, A. W. H., Eddingsaas, N. C., Chan, M. N., Loza, C. L., Kwan, A. J., Hersey, S. P., Flagan, R. C., Wennberg, P. O., and Seinfeld, J. H.: Reactive intermediates revealed in secondary organic aerosol formation from isoprene, Proc. Natl. Acad. Sci. USA, 107, 6640–6645, 2010. </mixed-citation>
</ref>
<ref id="ref42">
<label>42</label><mixed-citation publication-type="other" xlink:type="simple"> Szmigielski, R., Surratt, J. D., Gómez-González, Y., Van der Veken, P., Kourtchev, I., Vermeylen, R., Blockhuys, F., Jaoui, M., Kleindienst, T. E., Lewandowski, M., Offenberg, J. H., Edney, E. O., Seinfeld, J. H., Maenhaut, W., and Claeys, M.: 3-methyl-1,2,3-butanetricarboxylic acid: An atmospheric tracer for terpene secondary organic aerosol, Geophys. Res. Lett., 34, L24811, http://dx.doi.org/10.1029/2007GL031338doi:10.1029/2007GL031338, 2007. </mixed-citation>
</ref>
<ref id="ref43">
<label>43</label><mixed-citation publication-type="other" xlink:type="simple"> Viana, M., Chi, X., Maenhaut, W., Querol, X., Alastuey, A., Mikuška, P., and Veče\vra, Z.: Organic and elemental carbon concentrations in carbonaceous aerosols during summer and winter sampling campaigns in Barcelona, Spain, Atmos. Environ., 40, 2180–2193, 2006. </mixed-citation>
</ref>
<ref id="ref44">
<label>44</label><mixed-citation publication-type="other" xlink:type="simple"> Wang, W.: Inorganic and Organic Speciation of Atmospheric Aerosols by Ion Chromatography and Aerosol Chemical Mass Closure, PhD thesis, Ghent University, 363 pp., ISBN: 978-90-5989-384-9, 2010. </mixed-citation>
</ref>
<ref id="ref45">
<label>45</label><mixed-citation publication-type="other" xlink:type="simple"> Winterhalter, R., Van Dingenen, R., Larsen, B. R., Jensen, N., and Hjorth, R. J.: LC-MS analysis of aerosol particles from the oxidation of $\alpha $-pinene by ozone and OH-radicals, Atmos. Chem. Phys. Discuss., 3, 1–39, http://dx.doi.org/10.5194/acpd-3-1-2003doi:10.5194/acpd-3-1-2003, 2003. </mixed-citation>
</ref>
<ref id="ref46">
<label>46</label><mixed-citation publication-type="other" xlink:type="simple"> Worton, D. R., Goldstein, A. H., Farmer, D. K., Docherty, K. S., Jimenez, J. L., Gilman, J. B., Kuster, W. C., de Gouw, J., Williams, B. J., Kreisberg, N. M., Hering, S. V., Bench, G., McKay, M., Kristensen, K., Glasius, M., Surratt, J. D., and Seinfeld, J. H.: Origins and composition of fine atmospheric carbonaceous aerosol in the Sierra Nevada Mountains, California, Atmos. Chem. Phys., 11, 10219–10241, http://dx.doi.org/10.5194/acp-11-10219-2011doi:10.5194/acp-11-10219-2011, 2011. </mixed-citation>
</ref>
<ref id="ref47">
<label>47</label><mixed-citation publication-type="other" xlink:type="simple"> Yasmeen, F., Vermeylen, R., Szmigielski, R., Iinuma, Y., Böge, O., Herrmann, H., Maenhaut, W., and Claeys, M.: Terpenylic acid and related compounds: precursors for dimers in secondary organic aerosol from the ozonolysis of $\alpha $- and $\beta $-pinene, Atmos. Chem. Phys., 10, 9383–9392, http://dx.doi.org/10.5194/acp-10-9383-2010doi:10.5194/acp-10-9383-2010, 2010. </mixed-citation>
</ref>
<ref id="ref48">
<label>48</label><mixed-citation publication-type="other" xlink:type="simple"> Yasmeen, F., Szmigielski, R., Vermeylen, R., Gómez-González, Y., Surratt, J. D., Chan, A. W. R., Seinfeld, J. H., Maenhaut, W., and Claeys, M.: Mass spectrometric characterization of isomeric terpenoic acids from the oxidation of $\alpha $-pinene, $\beta $-pinene, $d$-limonene, and $\Delta ^3$-carene in fine forest aerosol, J. Mass Spectrom., 46, 425–442, 2011. </mixed-citation>
</ref>
<ref id="ref49">
<label>49</label><mixed-citation publication-type="other" xlink:type="simple"> Yu, J., Cocker III, D. R., Griffin, R. J., Flagan, R. C., and Seinfeld, J. H.: Gas-phase ozone oxidation of monoterpenes: Gaseous and particulate products, J. Atmos. Chem., 34, 207–258, 1999. </mixed-citation>
</ref>
<ref id="ref50">
<label>50</label><mixed-citation publication-type="other" xlink:type="simple"> Zhang, Y. Y., Müller, L., Winterhalter, R., Moortgat, G. K., Hoffmann, T., and Pöschl, U.: Seasonal cycle and temperature dependence of pinene oxidation products, dicarboxylic acids and nitrophenols in fine and coarse air particulate matter, Atmos. Chem. Phys., 10, 7859–7873, http://dx.doi.org/10.5194/acp-10-7859-2010doi:10.5194/acp-10-7859-2010, 2010. </mixed-citation>
</ref>
</ref-list>
</back>
</article>