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Volume 18, issue 5 | Copyright

Special issue: Amazon Tall Tower Observatory (ATTO) Special Issue

Atmos. Chem. Phys., 18, 3403-3418, 2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 08 Mar 2018

Research article | 08 Mar 2018

Monoterpene chemical speciation in a tropical rainforest:variation with season, height, and time of dayat the Amazon Tall Tower Observatory (ATTO)

Ana María Yáñez-Serrano1,a, Anke Christine Nölscher1,b, Efstratios Bourtsoukidis1, Eliane Gomes Alves2, Laurens Ganzeveld3, Boris Bonn4, Stefan Wolff1, Marta Sa2, Marcia Yamasoe5, Jonathan Williams1, Meinrat O. Andreae1,6, and Jürgen Kesselmeier1 Ana María Yáñez-Serrano et al.
  • 1Air Chemistry, Biogeochemistry and Multiphase Departments, Max Planck Institute for Chemistry, Mainz, Germany
  • 2Instituto Nacional de Pesquisas da Amazônia (INPA), Av. André Araújo 2936, Manaus, AM, Brazil
  • 3Meteorology and Air Quality (MAQ), Department of Environmental Sciences,Wageningen University and Research Centre, Wageningen, the Netherlands
  • 4Tree Physiology, Albert Ludwig University, Freiburg, Germany
  • 5Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo,Rua do Matão 122, São Paulo, SP, Brazil
  • 6Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA, USA
  • anow at: Ecosystem Physiology, Albert Ludwig University, Freiburg, Germany
  • bnow at: German Weather Service, Offenbach am Main, Germany

Abstract. Speciated monoterpene measurements in rainforest air are scarce, but they are essential for understanding the contribution of these compounds to the overall reactivity of volatile organic compound (VOC) emissions towards the main atmospheric oxidants, such as hydroxyl radicals (OH), ozone (O3) and nitrate radicals (NO3). In this study, we present the chemical speciation of gas-phase monoterpenes measured in the tropical rainforest at the Amazon Tall Tower Observatory (ATTO, Amazonas, Brazil). Samples of VOCs were collected by two automated sampling systems positioned on a tower at 12 and 24m height and analysed using gas chromatography–flame ionization detection. The samples were collected in October 2015, representing the dry season, and compared with previous wet and dry season studies at the site. In addition, vertical profile measurements (at 12 and 24m) of total monoterpene mixing ratios were made using proton-transfer-reaction mass spectrometry. The results showed a distinctly different chemical speciation between day and night. For instance, α-pinene was more abundant during the day, whereas limonene was more abundant at night. Reactivity calculations showed that higher abundance does not generally imply higher reactivity. Furthermore, inter- and intra-annual results demonstrate similar chemodiversity during the dry seasons analysed. Simulations with a canopy exchange modelling system show simulated monoterpene mixing ratios that compare relatively well with the observed mixing ratios but also indicate the necessity of more experiments to enhance our understanding of in-canopy sinks of these compounds.

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This study shows the measurements of concentration of different monoterpene species in terms of height, time of day and season. Speciation seems similar during the dry seasons but changes with season. Furthermore, reactivity with the different oxidants demonstrated that a higher abundance of a monoterpene species does not automatically imply higher reactivity and that the most abundant monoterpene may not be the most atmospheric chemically relevant compound.
This study shows the measurements of concentration of different monoterpene species in terms of...