Fechar
Metadados

@InProceedings{BotiaGerMarFisLav:2018:TrNiMe,
               author = "Botia, Santiago and Gerbig, Christoph and Marshall, Julia and 
                         Fisch, Gilberto and Lavric, Jost Valentin",
          affiliation = "{Max Planck Institute for Biogeochemistry} and {Max Planck 
                         Institute for Biogeochemistry} and {Max Planck Institute for 
                         Biogeochemistry} and {Instituto Nacional de Pesquisas Espaciais 
                         (INPE)} and {Max Planck Institute for Biogeochemistry}",
                title = "Tracking Nighttime Methane Signals at the Amazon Tall Tower 
                         Observatory (ATTO)",
                 year = "2018",
         organization = "AGU Fall Meeting",
             abstract = "During the last decades global methane growth rate has been 
                         variable with a stabilization period between 1999-2006, and a 
                         steady increase since 2007. The most important individual source 
                         of methane globally are wetlands, which in the Amazon rainforest 
                         are abundant. Wetland emissions in the Amazon represent 15% of the 
                         global wetland emissions. Therefore, understanding the main 
                         drivers of methane emissions in this region is vital to constrain 
                         its global variability. At the Amazon Tall Tower Observatory 
                         (ATTO), an unprecedented 6-year record of methane concentrations 
                         at half-hourly intervals provides a unique opportunity to 
                         understand methane variability at different temporal scales. 
                         Methane concentrations show a seasonal pattern at all 5 
                         measurement levels, with a peak during the dry season. 
                         Interestingly, the maximum values are found at the highest 
                         measurement inlet (80m). Our data record shows that for some years 
                         this dry season peak is mainly driven by a nighttime methane 
                         enhancement at the highest level, when the nocturnal boundary 
                         layer is under stable conditions and there is almost a complete 
                         absence of vertical mixing. Here we present a detailed analysis of 
                         the atmospheric conditions within and above the canopy for this 
                         nighttime methane enhancement, showing that the main process 
                         responsible for the majority of vertical exchange is intermittent 
                         turbulence; a characteristic of the nocturnal boundary layer in 
                         the Amazon. In addition, we provide a footprint analysis to derive 
                         the source of this nocturnal methane by using high-resolution 
                         atmospheric modeling (WRF-STILT). Preliminary results show that 
                         this footprint could vary from 80 to 150 km, when the predominant 
                         wind is from the northeast.",
  conference-location = "Washington, D. C.",
      conference-year = "10-14 dec.",
             language = "en",
        urlaccessdate = "05 dez. 2020"
}


Fechar