author = "Wolff, Stefan Aiko and Ganzeveld, Laurens and Tsokankunku, 
                         Anywhere and Poehlker, Christopher and S{\'a}, Leonardo Deane de 
                         Abreu and Manzi, Antonio Ocimar and Souza, Rodrigo and Trebs, 
                         Ivonne and Soergel, Matthias",
          affiliation = "{Max Planck Institute for Chemistry} and {Environmental Sciences 
                         Department} and {Max Planck Institute for Chemistry} and {Max 
                         Planck Institute for Chemistry Germany} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)} and {Instituto Nacional de Pesquisas 
                         da Amaz{\^o}nia (INPA)} and {Instituto Nacional de Pesquisas da 
                         Amaz{\^o}nia (INPA)} and Luxembourg Institute of Science and 
                         Technology, Environmental Research and Innovation (ERIN) and {Max 
                         Planck Institute for Chemistry}",
                title = "Profiles of NOX and O3 in an amazonian rainforest: comparison of 
                         measured profiles with a multi-layter canopy chemical exchange 
                 year = "2016",
         organization = "IGAC Science Conference",
             abstract = "In 2011, an 80 m high walk up tower for atmospheric research was 
                         erected at the ATTO (Amazon Tall Tower Observatory) site 
                         (02░0838.8S, 58░5959.5W) in the remote Amazonian rainforest. The 
                         nearly pristine environment allows biosphere-atmosphere studies 
                         within an ecosystem far away from large anthropogenic emission 
                         sources. Since April 2012 vertical mixing ratio profiles of H2 O, 
                         CO2 and O3 were measured at 8 different heights between 0.05 m and 
                         79.3 m. During five intensive campaigns (Oct-Dec 2012, OctNov 
                         2013, Mar 2014, Aug-Sepá2014, Oct-Dec 2015) nitric oxide (NO) and 
                         nitrogen dioxide (NO2 ) were also measured. Since the end of 2015 
                         NOx measurements are performed continuously. We applied the 
                         Multi-layer Canopy Chemical Exchange Model MLC-CHEM to support the 
                         analysis of the observed profiles of NOx and O3 . This includes 
                         inferring bi-directional surface-atmosphere exchange fluxes as 
                         well as the role of the canopy interactions between the emissions, 
                         dry deposition, chemistry and turbulent transport of trace gases. 
                         During our investigation of diurnal and seasonal differences 
                         between model and measurements, we conducted a set of sensitivity 
                         studies to analyse the effects of changes in NOx -soil emissions, 
                         in-canopy turbulence and resistances for O3 and NO2 uptake on wet 
                         surfaces. These analyses suggest some modification in the 
                         representation of some of the poorly constrained canopy processes 
                         resulting in a significantly better agreement between the 
                         simulated and measured exchange fluxes and concentrations. 
                         Furthermore we have compared different NOx -soil emission 
                         flux-scenarios with NOx - fluxes measured by different 
  conference-location = "Colorado, USA",
      conference-year = "26-30 Sept.",
           targetfile = "wolff_profiles.pdf",
        urlaccessdate = "27 jan. 2021"