<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE article PUBLIC "-//NLM//DTD Journal Publishing DTD v3.0 20080202//EN" "https://jats.nlm.nih.gov/nlm-dtd/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>
<abbrev-journal-title abbrev-type="nlm-ta">Atmos. Chem. Phys.</abbrev-journal-title>
</journal-title-group>
<issn pub-type="epub">1680-7324</issn>
<publisher><publisher-name>Copernicus Publications</publisher-name>
<publisher-loc>Göttingen, Germany</publisher-loc>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="doi">10.5194/acp-10-4343-2010</article-id>
<title-group>
<article-title>Large estragole fluxes from oil palms in Borneo</article-title>
</title-group>
<contrib-group><contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Misztal</surname>
<given-names>P. K.</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Owen</surname>
<given-names>S. M.</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>Guenther</surname>
<given-names>A. B.</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>Rasmussen</surname>
<given-names>R.</given-names>
</name>
<xref ref-type="aff" rid="aff6">
<sup>6</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Geron</surname>
<given-names>C.</given-names>
</name>
<xref ref-type="aff" rid="aff5">
<sup>5</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Harley</surname>
<given-names>P.</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>Phillips</surname>
<given-names>G. J.</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>Ryan</surname>
<given-names>A.</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>Edwards</surname>
<given-names>D. P.</given-names>
</name>
<xref ref-type="aff" rid="aff7">
<sup>7</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Hewitt</surname>
<given-names>C. N.</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>Nemitz</surname>
<given-names>E.</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>Siong</surname>
<given-names>J.</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="aff" rid="aff8">
<sup>8</sup>
</xref>
</contrib>
<contrib contrib-type="author" xlink:type="simple"><name name-style="western"><surname>Heal</surname>
<given-names>M. R.</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>Cape</surname>
<given-names>J. N.</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
</contrib>
</contrib-group><aff id="aff1">
<label>1</label>
<addr-line>Centre for Ecology &amp; Hydrology, Penicuik, EH26 0QB, UK</addr-line>
</aff>
<aff id="aff2">
<label>2</label>
<addr-line>School of Chemistry, University of Edinburgh, Edinburgh, EH9 3JJ, UK</addr-line>
</aff>
<aff id="aff3">
<label>3</label>
<addr-line>Lancaster Environment Centre, Lancaster University, Lancaster, LA1 4YQ, UK</addr-line>
</aff>
<aff id="aff4">
<label>4</label>
<addr-line>Atmospheric Chemistry Division, National Center for Atmospheric Research, 1850 Table Mesa Drive, Boulder, Colorado, 80305, USA</addr-line>
</aff>
<aff id="aff5">
<label>5</label>
<addr-line>US Environmental Protection Agency, National Risk Management Research Laboratory, Mail Drop E305-02, 109 TW Alexander Dr., Research Triangle Park, NC 27711, USA</addr-line>
</aff>
<aff id="aff6">
<label>6</label>
<addr-line>Department of Environmental Science and Engineering, Oregon Graduate Institute, P.O. Box 91000, Portland, OR 97291, USA</addr-line>
</aff>
<aff id="aff7">
<label>7</label>
<addr-line>Institute of Integrative and Comparative Biology, University of Leeds, Leeds, LS2 9JT, UK</addr-line>
</aff>
<aff id="aff8">
<label>8</label>
<addr-line>School of Science and Technology, Universiti Malaysia Sabah, 88999, Malaysia</addr-line>
</aff>
<pub-date pub-type="epub">
<day>07</day>
<month>05</month>
<year>2010</year>
</pub-date>
<volume>10</volume>
<issue>9</issue>
<fpage>4343</fpage>
<lpage>4358</lpage>
<permissions>
<copyright-statement>Copyright: &#x000a9; 2010 P. K. Misztal et al.</copyright-statement>
<copyright-year>2010</copyright-year>
<license license-type="open-access">
<license-p>This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit <ext-link ext-link-type="uri"  xlink:href="https://creativecommons.org/licenses/by/3.0/">https://creativecommons.org/licenses/by/3.0/</ext-link></license-p>
</license>
</permissions>
<self-uri xlink:href="https://acp.copernicus.org/articles/10/4343/2010/acp-10-4343-2010.html">This article is available from https://acp.copernicus.org/articles/10/4343/2010/acp-10-4343-2010.html</self-uri>
<self-uri xlink:href="https://acp.copernicus.org/articles/10/4343/2010/acp-10-4343-2010.pdf">The full text article is available as a PDF file from https://acp.copernicus.org/articles/10/4343/2010/acp-10-4343-2010.pdf</self-uri>
<abstract>
<p>During two field campaigns (OP3 and ACES), which ran in Borneo in 2008, we
measured large emissions of estragole (methyl chavicol;  IUPAC systematic
name 1-allyl-4-methoxybenzene;  CAS number 140-67-0) in ambient air above oil
palm canopies (0.81 mg m&lt;sup&gt;&amp;minus;2&lt;/sup&gt; h&lt;sup&gt;&amp;minus;1&lt;/sup&gt; and 3.2 ppbv for mean midday fluxes
and mixing ratios respectively) and subsequently from flower enclosures.
However, we did not detect this compound at a nearby rainforest. Estragole
is a known attractant of the African oil palm weevil (&lt;i&gt;Elaeidobius kamerunicus&lt;/i&gt;), which pollinates
oil palms (&lt;i&gt;Elaeis guineensis&lt;/i&gt;). There has been recent interest in the biogenic emissions of
estragole but it is normally not included in atmospheric models of biogenic
emissions and atmospheric chemistry despite its relatively high potential
for secondary organic aerosol formation from photooxidation and high
reactivity with OH radical. We report the first direct canopy-scale
measurements of estragole fluxes from tropical oil palms by the virtual
disjunct eddy covariance technique and compare them with previously reported
data for estragole emissions from Ponderosa pine. Flowers, rather than
leaves, appear to be the main source of estragole from oil palms;  we derive
a global estimate of estragole emissions from oil palm plantations of ~0.5 Tg y&lt;sup&gt;&amp;minus;1&lt;/sup&gt;. The observed ecosystem mean fluxes (0.44 mg m&lt;sup&gt;&amp;minus;2&lt;/sup&gt; h&lt;sup&gt;&amp;minus;1&lt;/sup&gt;)
and mean ambient volume mixing ratios (3.0 ppbv) of estragole are
the highest reported so far. The value for midday mixing ratios is not much
different from the total average as, unlike other VOCs (e.g. isoprene), the
main peak occurred in the evening rather than in the middle of the day.
Despite this, we show that the estragole flux can be parameterised using a modified 
G06 algorithm for emission. However, the model underestimates the afternoon
peak even though a similar approach works well for isoprene. Our
measurements suggest that this biogenic compound may have an impact on
regional atmospheric chemistry that previously has not been accounted for in
models and could become more important in the future due to expansion of the
areas of oil palm plantation.</p>
</abstract>
<counts><page-count count="16"/></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">Altshuller, A. P.: Review – Natural volatile organic-substances and their effect on air-quality in the United-States, Atmos. Environ., 17, 2131–2165, 1983.</mixed-citation>
</ref>
<ref id="ref2">
<label>2</label><mixed-citation publication-type="other" xlink:type="simple">Binnie, J., Cape, J. N., Mackie, N., and Leith, I. D.: Exchange of organic solvents between the atmosphere and grass – the use of open top chambers, Sci. Total Environ., 285, 53–67, 2002.</mixed-citation>
</ref>
<ref id="ref3">
<label>3</label><mixed-citation publication-type="other" xlink:type="simple">Blake, R. S., Monks, P. S., and Ellis, A. M.: Proton-Transfer Reaction Mass Spectrometry, Chem. Rev., 109, 861–896, https://doi.org/10.1021/cr800364q, 2009.</mixed-citation>
</ref>
<ref id="ref4">
<label>4</label><mixed-citation publication-type="other" xlink:type="simple">Bouvier-Brown, N. C., Holzinger, R., Palitzsch, K., and Goldstein, A. H.: Quantifying sesquiterpene and oxygenated terpene emissions from live vegetation using solid-phase microextraction fibers, J. Chromatography A, 1161, 113–120, 2007.</mixed-citation>
</ref>
<ref id="ref5">
<label>5</label><mixed-citation publication-type="other" xlink:type="simple">Bouvier-Brown, N. C., Goldstein, A. H., Worton, D. R., Matross, D. M., Gilman, J. B., Kuster, W. C., Welsh-Bon, D., Warneke, C., de Gouw, J. A., Cahill, T. M., and Holzinger, R.: Methyl chavicol: characterization of its biogenic emission rate, abundance, and oxidation products in the atmosphere, Atmos. Chem. Phys., 9, 2061–2074, https://doi.org/10.5194/acp-9-2061-2009, 2009a.</mixed-citation>
</ref>
<ref id="ref6">
<label>6</label><mixed-citation publication-type="other" xlink:type="simple">Bouvier-Brown, N. C., Holzinger, R., Palitzsch, K., and Goldstein, A. H.: Large emissions of sesquiterpenes and methyl chavicol quantified from branch enclosure measurements, Atmos. Environ., 43, 389–401, https://doi.org/10.1016/j.atmosenv.2008.08.039, 2009b.</mixed-citation>
</ref>
<ref id="ref7">
<label>7</label><mixed-citation publication-type="other" xlink:type="simple">Buchmann, N., Guehl, J. M., Barigah, T. S., and Ehleringer, J. R.: Interseasonal comparison of CO2 concentrations, isotopic composition, and carbon dynamics in an Amazonian rainforest (French Guiana), Oecologia, 110, 120–131, 1997.</mixed-citation>
</ref>
<ref id="ref8">
<label>8</label><mixed-citation publication-type="other" xlink:type="simple">Culf, A. D., Fisch, G., Malhi, Y., Carvalho Costa, R., Nobre, A. D., de O. Marques Filho, A., Gash, J. H. C., and Grace, J.: Carbon dioxide measurements in the nocturnal boundary layer over Amazonian forest, Hydrol. Earth Syst. Sci., 3, 39–53, https://doi.org/10.5194/hess-3-39-1999, 1999.</mixed-citation>
</ref>
<ref id="ref9">
<label>9</label><mixed-citation publication-type="other" xlink:type="simple">Davison, B., Taipale, R., Langford, B., Misztal, P., Fares, S., Matteucci, G., Loreto, F., Cape, J. N., Rinne, J., and Hewitt, C. N.: Concentrations and fluxes of biogenic volatile organic compounds above a Mediterranean macchia ecosystem in western Italy, Biogeosciences, 6, 1655–1670, https://doi.org/10.5194/bg-6-1655-2009, 2009.</mixed-citation>
</ref>
<ref id="ref10">
<label>10</label><mixed-citation publication-type="other" xlink:type="simple">de Gouw, J., Warneke, C., Karl, T., Eerdekens, G., van der Veen, C., and Fall, R.: Sensitivity and specificity of atmospheric trace gas detection by proton-transfer-reaction mass spectrometry, Int. J. Mass Spectrom., 223–224, 365–382, 2003.</mixed-citation>
</ref>
<ref id="ref11">
<label>11</label><mixed-citation publication-type="other" xlink:type="simple">DeCarlo, P. F., Kimmel, J. R., Trimborn, A., Northway, M. J., Jayne, J. T., Aiken, A. C., Gonin, M., Fuhrer, K., Horvath, T., Docherty, K. S., Worsnop, D. R., and Jimenez, J. L.: Field-deployable, high-resolution, time-of-flight aerosol mass spectrometer, Anal. Chem., 78, 8281–8289, https://doi.org/10.1021/ac061249n, 2006.</mixed-citation>
</ref>
<ref id="ref12">
<label>12</label><mixed-citation publication-type="other" xlink:type="simple">Ervik, F., Tollsten, L., and Knudsen, J. T.: Floral scent chemistry and pollination ecology in phytelephantoid palms (Arecaceae), Plant Syst. Evol., 217, 279–297, 1999.</mixed-citation>
</ref>
<ref id="ref13">
<label>13</label><mixed-citation publication-type="other" xlink:type="simple">FAOSTAT: Online Statistical Service. Item: Oil palm fruit;  element: area harvested;  year: 2007;  country: World, South East Asia, Malaysia, Indonesia, online available at: &lt;a href=&quot;http://faostat.fao.org&quot;&gt;http://faostat.fao.org&lt;/a&gt; (last access: April 2009), 2009.</mixed-citation>
</ref>
<ref id="ref14">
<label>14</label><mixed-citation publication-type="other" xlink:type="simple">Foken, T. and Wichura, B.: Tools for quality assessment of surface-based flux measurements, Agr. Forest Meteorol., 78, 83–105, 1996.</mixed-citation>
</ref>
<ref id="ref15">
<label>15</label><mixed-citation publication-type="other" xlink:type="simple">Geron, C., Guenther, A., Sharkey, T., and Arnts, R. R.: Temporal variability in basal isoprene emission factor, Tree Physiol., 20, 799–805, 2000.</mixed-citation>
</ref>
<ref id="ref16">
<label>16</label><mixed-citation publication-type="other" xlink:type="simple">Geron, C., Owen, S., Guenther, A., Greenberg, J., Rasmussen, R., Hui Bai, J., Li, Q.-J., and Baker, B.: Volatile organic compounds from vegetation in southern Yunnan Province, China: Emission rates and some potential regional implications, Atmos. Environ., 40, 1759–1773, 2006.</mixed-citation>
</ref>
<ref id="ref17">
<label>17</label><mixed-citation publication-type="other" xlink:type="simple">Guenther, A., Hewitt, C. N., Erickson, D., Fall, R., Geron, C., Graedel, T., Harley, P., Klinger, L., Lerdau, M., McKay, W. A., Pierce, T., Scholes, B., Steinbrecher, R., Tallamraju, R., Taylor, J., and Zimmerman, P.: A global-model o fnatural volatile organic-compound emissions, J. Geophys. Res.-Atmos., 100, 8873–8892, 1995.</mixed-citation>
</ref>
<ref id="ref18">
<label>18</label><mixed-citation publication-type="other" xlink:type="simple">Guenther, A., Baugh, B., Brasseur, G., Greenberg, J., Harley, P., Klinger, L., Serça, D., and Vierling, L.: Isoprene emission estimates and uncertainties for the Central African EXPRESSO study domain, J. Geophys. Res., 104, 30625–30639, https://doi.org/10.1029/1999jd900391, 1999.</mixed-citation>
</ref>
<ref id="ref19">
<label>19</label><mixed-citation publication-type="other" xlink:type="simple">Guenther, A., Karl, T., Harley, P., Wiedinmyer, C., Palmer, P. I., and Geron, C.: Estimates of global terrestrial isoprene emissions using MEGAN (Model of Emissions of Gases and Aerosols from Nature), Atmos. Chem. Phys., 6, 3181–3210, https://doi.org/10.5194/acp-6-3181-2006, 2006.</mixed-citation>
</ref>
<ref id="ref20">
<label>20</label><mixed-citation publication-type="other" xlink:type="simple">Guenther, A. B., Zimmerman, P. R., Harley, P. C., Monson, R. K., and Fall, R.: Isoprene and monoterpene emission rate variability - model evaluations and sensitivity analyses, J. Geophys. Res.-Atmos., 98, 12609–12617, 1993.</mixed-citation>
</ref>
<ref id="ref21">
<label>21</label><mixed-citation publication-type="other" xlink:type="simple">Hanson, D. T. and Sharkey, T. D.: Rate of acclimation of the capacity for isoprene emission in response to light and temperature, Plant Cell Environ., 24, 937–946, 2001.</mixed-citation>
</ref>
<ref id="ref22">
<label>22</label><mixed-citation publication-type="other" xlink:type="simple">Hartley, C. W. S.: The oil palm (&lt;i&gt;Elaeis guineensis &lt;/i&gt;Jacq.), 3rd ed., Tropical Agriculture Series, Longman Scientific &amp; Technical, Harlow, 1988.</mixed-citation>
</ref>
<ref id="ref23">
<label>23</label><mixed-citation publication-type="other" xlink:type="simple">Heiden, A. C., Kobel, K., Komenda, M., Koppmann, R., Shao, M., and Wildt, J.: Toluene Emissions from Plants, Geophys. Res. Lett., 26, 1283–1286, 1999.</mixed-citation>
</ref>
<ref id="ref24">
<label>24</label><mixed-citation publication-type="other" xlink:type="simple">Helmig, D., Ortega, J., Guenther, A., Herrick, J. D., and Geron, C.: Sesquiterpene emissions from loblolly pine and their potential contribution to biogenic aerosol formation in the Southeastern US, Atmos. Environ., 40, 4150–4157, 2006.</mixed-citation>
</ref>
<ref id="ref25">
<label>25</label><mixed-citation publication-type="other" xlink:type="simple">Henderson, A.: A Review of Pollination Studies in the Palmae, Botan. Rev., 52, 221–259, 1986.</mixed-citation>
</ref>
<ref id="ref26">
<label>26</label><mixed-citation publication-type="other" xlink:type="simple">Hewitt, C. N., Lee, J. D., MacKenzie, A. R., Barkley, M. P., Carslaw, N., Carver, G. D., Chappell, N. A., Coe, H., Collier, C., Commane, R., Davies, F., Davison, B., DiCarlo, P., Di Marco, C. F., Dorsey, J. R., Edwards, P. M., Evans, M. J., Fowler, D., Furneaux, K. L., Gallagher, M., Guenther, A., Heard, D. E., Helfter, C., Hopkins, J., Ingham, T., Irwin, M., Jones, C., Karunaharan, A., Langford, B., Lewis, A. C., Lim, S. F., MacDonald, S. M., Mahajan, A. S., Malpass, S., McFiggans, G., Mills, G., Misztal, P., Moller, S., Monks, P. S., Nemitz, E., Nicolas-Perea, V., Oetjen, H., Oram, D. E., Palmer, P. I., Phillips, G. J., Pike, R., Plane, J. M. C., Pugh, T., Pyle, J. A., Reeves, C. E., Robinson, N. H., Stewart, D., Stone, D., Whalley, L. K., and Yin, X.: Overview: oxidant and particle photochemical processes above a south-east Asian tropical rainforest (the OP3 project): introduction, rationale, location characteristics and tools, Atmos. Chem. Phys., 10, 169–199, https://doi.org/10.5194/acp-10-169-2010, 2010.</mixed-citation>
</ref>
<ref id="ref27">
<label>27</label><mixed-citation publication-type="other" xlink:type="simple">Holzinger, R., Lee, A., Paw, K. T., and Goldstein, U. A. H.: Observations of oxidation products above a forest imply biogenic emissions of very reactive compounds, Atmos. Chem. Phys., 5, 67–75, https://doi.org/10.5194/acp-5-67-2005, 2005.</mixed-citation>
</ref>
<ref id="ref28">
<label>28</label><mixed-citation publication-type="other" xlink:type="simple">Hussein, M. Y., Lajis, N. H., Kinson, A., and Teo, C. B.: Laboratory and field evaluation on the attractancy of &lt;i&gt;Elaeidobius kamerunicus&lt;/i&gt; Faust to 4-allylanisole, Porim Bull., 18, 20–26, 1989.</mixed-citation>
</ref>
<ref id="ref29">
<label>29</label><mixed-citation publication-type="other" xlink:type="simple">Hussein, M. Y., Lajis, N. H., and Ali, J. H.: Biological and chemical factors associated with the successful introduction of &lt;i&gt;Elaeidobius kamerunicus&lt;/i&gt; Faust, the oil palm pollinator in Malaysia, Acta Hort. (ISHS) 288, 81–87, 1991.</mixed-citation>
</ref>
<ref id="ref30">
<label>30</label><mixed-citation publication-type="other" xlink:type="simple">Jayne, J. T., Leard, D. C., Zhang, X. F., Davidovits, P., Smith, K. A., Kolb, C. E., and Worsnop, D. R.: Development of an aerosol mass spectrometer for size and composition analysis of submicron particles, Aerosol Sci. Technol., 33, 49–70, 2000.</mixed-citation>
</ref>
<ref id="ref31">
<label>31</label><mixed-citation publication-type="other" xlink:type="simple">Jimenez, J. L., Jayne, J. T., Shi, Q., Kolb, C. E., Worsnop, D. R., Yourshaw, I., Seinfeld, J. H., Flagan, R. C., Zhang, X. F., Smith, K. A., Morris, J. W., and Davidovits, P.: Ambient aerosol sampling using the Aerodyne Aerosol Mass Spectrometer, J. Geophys. Res.-Atmos., 108, 8425 https://doi.org/10.1029/2001jd001213, 2003.</mixed-citation>
</ref>
<ref id="ref32">
<label>32</label><mixed-citation publication-type="other" xlink:type="simple">Karl, T. G., Spirig, C., Rinne, J., Stroud, C., Prevost, P., Greenberg, J., Fall, R., and Guenther, A.: Virtual disjunct eddy covariance measurements of organic compound fluxes from a subalpine forest using proton transfer reaction mass spectrometry, Atmos. Chem. Phys., 2, 279–291, https://doi.org/10.5194/acp-2-279-2002, 2002.</mixed-citation>
</ref>
<ref id="ref33">
<label>33</label><mixed-citation publication-type="other" xlink:type="simple">Kim, S., Karl, T., Helmig, D., Daly, R., Rasmussen, R., and Guenther, A.: Measurement of atmospheric sesquiterpenes by proton transfer reaction-mass spectrometry (PTR-MS), Atmos. Meas. Tech., 2, 99–112, https://doi.org/10.5194/amt-2-99-2009, 2009.</mixed-citation>
</ref>
<ref id="ref34">
<label>34</label><mixed-citation publication-type="other" xlink:type="simple">Knudsen, J. T., Tollsten, L., and Ervik, F.: Flower scent and pollination in selected neotropical palms, Plant Biol., 3, 642–653, 2001.</mixed-citation>
</ref>
<ref id="ref35">
<label>35</label><mixed-citation publication-type="other" xlink:type="simple">Langford, B., Davison, B., Nemitz, E., and Hewitt, C. N.: Mixing ratios and eddy covariance flux measurements of volatile organic compounds from an urban canopy (Manchester, UK), Atmos. Chem. Phys., 9, 1971–1987, https://doi.org/10.5194/acp-9-1971-2009, 2009.</mixed-citation>
</ref>
<ref id="ref36">
<label>36</label><mixed-citation publication-type="other" xlink:type="simple">Lee, A., Goldstein, A. H., Keywood, M. D., Gao, S., Varutbangkul, V., Bahreini, R., Ng, N. L., Flagan, R. C., and Seinfeld, J. H.: Gas-phase products and secondary aerosol yields from the ozonolysis of ten different terpenes, J. Geophys. Res.-Atmos., 111, D07302, https://doi.org/10.1029/2005jd006437, 2006a.</mixed-citation>
</ref>
<ref id="ref37">
<label>37</label><mixed-citation publication-type="other" xlink:type="simple">Lee, A., Goldstein, A. H., Kroll, J. H., Ng, N. L., Varutbangkul, V., Flagan, R. C., and Seinfeld, J. H.: Gas-phase products and secondary aerosol yields from the photooxidation of 16 different terpenes, J. Geophys. Res.-Atmos., 111, D17305, https://doi.org/10.1029/2006jd007050, 2006b.</mixed-citation>
</ref>
<ref id="ref38">
<label>38</label><mixed-citation publication-type="other" xlink:type="simple">Lindinger, W., Hansel, A., and Jordan, A.: On-line monitoring of volatile organic compounds at pptv levels by means of proton-transfer-reaction mass spectrometry (PTR-MS) - Medical applications, food control and environmental research, Int. J. Mass Spectrom., 173, 191–241, 1998.</mixed-citation>
</ref>
<ref id="ref39">
<label>39</label><mixed-citation publication-type="other" xlink:type="simple">Mahbob, A.: The Pollinator &lt;i&gt;E. Camerunicus&lt;/i&gt; is Nature&apos;s little helper, Global Oil &amp; Fats Business Magazine, 5, 58–59, 2008.</mixed-citation>
</ref>
<ref id="ref40">
<label>40</label><mixed-citation publication-type="other" xlink:type="simple">Misztal, P. K., Nemitz, E., Langford, B., Coyle, M., Ryder, J., DiMarco, C., Phillips, G., Oram, D., Owen, S., Heal, M. R., and Cape, J. N.: First direct ecosystem fluxes of VOCs from oil palms in SE Asia, in preparation, 2010.</mixed-citation>
</ref>
<ref id="ref41">
<label>41</label><mixed-citation publication-type="other" xlink:type="simple">Monson, R. K., Harley, P. C., Litvak, M. E., Wildermuth, M., Guenther, A. B., Zimmerman, P. R., and Fall, R.: Environmental and developmental controls over the seasonal pattern of isoprene emission from aspen leaves, Oecologia, 99, 260–270, 1994.</mixed-citation>
</ref>
<ref id="ref42">
<label>42</label><mixed-citation publication-type="other" xlink:type="simple">Nemitz, E., Loubet, B., Lehmann, B. E., Cellier, P., Neftel, A., Jones, S. K., Hensen, A., Ihly, B., Tarakanov, S. V., and Sutton, M. A.: Turbulence characteristics in grassland canopies and implications for tracer transport, Biogeosciences, 6, 1519–1537, https://doi.org/10.5194/bg-6-1519-2009, 2009.</mixed-citation>
</ref>
<ref id="ref43">
<label>43</label><mixed-citation publication-type="other" xlink:type="simple">Nemitz, E., Phillips, G. J., Di Marco, C. F., Siong, J., Farmer, D., Kimmel, J., Jimenez, J., and Fowler, D.: Concentrations and fluxes of submicron aerosol components above an oilpalm plantation in Sabah, Malaysia, in preparation, 2010.</mixed-citation>
</ref>
<ref id="ref44">
<label>44</label><mixed-citation publication-type="other" xlink:type="simple">Petron, G., Harley, P., Greenberg, J., and Guenther, A.: Seasonal temperature variations influence isoprene emission, Geophys. Res. Lett., 28, 1707–1710, 2001.</mixed-citation>
</ref>
<ref id="ref45">
<label>45</label><mixed-citation publication-type="other" xlink:type="simple">Rinne, H. J. I., Guenther, A. B., Warneke, C., de Gouw, J. A., and Luxembourg, S. L.: Disjunct eddy covariance technique for trace gas flux measurements, Geophys. Res. Lett., 28, 3139–3142, 2001.</mixed-citation>
</ref>
<ref id="ref46">
<label>46</label><mixed-citation publication-type="other" xlink:type="simple">Rinne, J., Taipale, R., Markkanen, T., Ruuskanen, T. M., Hellén, H., Kajos, M. K., Vesala, T., and Kulmala, M.: Hydrocarbon fluxes above a Scots pine forest canopy: measurements and modeling, Atmos. Chem. Phys., 7, 3361–3372, https://doi.org/10.5194/acp-7-3361-2007, 2007.</mixed-citation>
</ref>
<ref id="ref47">
<label>47</label><mixed-citation publication-type="other" xlink:type="simple">Rosenstiel, T. N., Potosnak, M. J., Griffin, K. L., Fall, R., and Monson, R. K.: Increased CO&lt;sub&gt;2&lt;/sub&gt; uncouples growth from isoprene emission in an agriforest ecosystem, Nature, 421, 256–259, https://doi.org/10.1038/nature01312, 2003.</mixed-citation>
</ref>
<ref id="ref48">
<label>48</label><mixed-citation publication-type="other" xlink:type="simple">Sharkey, T. D., Singsaas, E. L., Lerdau, M. T., and Geron, C. D.: Weather effects on isoprene emission capacity and applications in emissions algorithms, Ecol. Appl., 9, 1132–1137, 1999.</mixed-citation>
</ref>
<ref id="ref49">
<label>49</label><mixed-citation publication-type="other" xlink:type="simple">Spirig, C., Neftel, A., Ammann, C., Dommen, J., Grabmer, W., Thielmann, A., Schaub, A., Beauchamp, J., Wisthaler, A., and Hansel, A.: Eddy covariance flux measurements of biogenic VOCs during ECHO 2003 using proton transfer reaction mass spectrometry, Atmos. Chem. Phys., 5, 465–481, https://doi.org/10.5194/acp-5-465-2005, 2005.</mixed-citation>
</ref>
<ref id="ref50">
<label>50</label><mixed-citation publication-type="other" xlink:type="simple">Steinbacher, M., Dommen, J., Ammann, C., Spirig, C., Neftel, A., and Prevot, A. S. H.: Performance characteristics of a proton-transfer-reaction mass spectrometer (PTR-MS) derived from laboratory and field measurements, Int. J. Mass Spectrom., 239, 117–128, 2004.</mixed-citation>
</ref>
<ref id="ref51">
<label>51</label><mixed-citation publication-type="other" xlink:type="simple">Sutton, M. A., Burkhardt, J. K., Guerin, D., Nemitz, E., and Fowler, D.: Development of resistance models to describe measurements of bi-directional ammonia surface-atmosphere exchange, International Conference on Atmospheric Ammonia – Emissions, Deposition and Environmental Impacts, Culham, England, ISI:000072633600029, 473–480, 1995.</mixed-citation>
</ref>
<ref id="ref52">
<label>52</label><mixed-citation publication-type="other" xlink:type="simple">Syed, R. A.: Studies on oil palm pollination by insects, Bull. Ent. Res., 69, 1979.</mixed-citation>
</ref>
<ref id="ref53">
<label>53</label><mixed-citation publication-type="other" xlink:type="simple">Taipale, R., Ruuskanen, T. M., Rinne, J., Kajos, M. K., Hakola, H., Pohja, T., and Kulmala, M.: Technical Note: Quantitative long-term measurements of VOC concentrations by PTR-MS – measurement, calibration, and volume mixing ratio calculation methods, Atmos. Chem. Phys., 8, 6681–6698, https://doi.org/10.5194/acp-8-6681-2008, 2008.</mixed-citation>
</ref>
<ref id="ref54">
<label>54</label><mixed-citation publication-type="other" xlink:type="simple">Tandon, R., Manohara, T. N., Nijalingappa, B. H. M., and Shivanna, K. R.: Pollination and Pollen-pistil Interaction in Oil Palm, Elaeis guineensis, Ann. Bot., 87, 831–838, https://doi.org/10.1006/anbo.2001.1421, 2001.</mixed-citation>
</ref>
<ref id="ref55">
<label>55</label><mixed-citation publication-type="other" xlink:type="simple">Terry, I., Moore, C. J., Walter, G. H., Forster, P. I., Roemer, R. B., Donaldson, J. D., and Machin, P. J.: Association of cone thermogenesis and volatiles with pollinator specificity in Macrozamia cycads, Plant Syst. Evol., 243, 233–247, https://doi.org/10.1007/s00606-003-0087-x, 2004.</mixed-citation>
</ref>
<ref id="ref56">
<label>56</label><mixed-citation publication-type="other" xlink:type="simple">Test Plan for Estragole: &lt;a href=&quot;http://www.epa.gov/HPV/pubs/summaries/estragole/c14022tp.pdf&quot;&gt;http://www.epa.gov/HPV/pubs/summaries/estragole/c14022tp.pdf&lt;/a&gt;, (last access: 21 April 2009), 2002.</mixed-citation>
</ref>
<ref id="ref57">
<label>57</label><mixed-citation publication-type="other" xlink:type="simple">US Environmental Protection Agency Estimation Program Interface (EPI): Suite v3.2: &lt;a href=&quot;http://www.epa.gov/opptintr/exposure/pubs/episuite.htm&quot;&gt;http://www.epa.gov/opptintr/exposure/pubs/episuite.htm&lt;/a&gt;, (last access: 21 September 2009), 2007.</mixed-citation>
</ref>
<ref id="ref58">
<label>58</label><mixed-citation publication-type="other" xlink:type="simple">Wang, Y. F., Owen, S. M., Li, Q. J., and Penuelas, J.: Monoterpene emissions from rubber trees (Hevea brasiliensis) in a changing landscape and climate: chemical speciation and environmental control, Glob. Change Biol., 13, 2270–2282, 2007.</mixed-citation>
</ref>
<ref id="ref59">
<label>59</label><mixed-citation publication-type="other" xlink:type="simple">White, M. L., Russo, R. S., Zhou, Y., Ambrose, J. L., Haase, K., Frinak, E. K., Varner, R. K., Wingenter, O. W., Mao, H., Talbot, R., and Sive, B. C.: Are biogenic emissions a significant source of summertime atmospheric toluene in the rural Northeastern United States?, Atmos. Chem. Phys., 9, 81–92, https://doi.org/10.5194/acp-9-81-2009, 2009.</mixed-citation>
</ref>
</ref-list>
</back>
</article>