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@Article{LiuBDRSBADKKGGMSSWMM:2016:IsPhOv,
               author = "Liu, Yingjun and Brito, Joel and Dorris, Matthew R. and 
                         Rivera-Rios, Jean C. and Seco, Roger and Bates, Kelvin H. and 
                         Artaxo, Paulo and Duvoisin, Sergio and Keutsch, Frank N. and Kim, 
                         Saewung and Goldstein, Allen H. and Guenther, Alex B. and Manzi, 
                         Antonio Ocimar and Souza, Rodrigo Augusto Ferreira de and 
                         Springston, Stephen R. and Watson, Thomas B. and Mckinney, Karena 
                         A. and Martin, Scot T.",
          affiliation = "{Harvard University} and {Universidade de S{\~a}o Paulo (USP)} 
                         and {University of Wisconsin-Madison} and {University of 
                         Wisconsin-Madison} and {University of California} and {California 
                         Institute of Technology} and {Universidade de S{\~a}o Paulo 
                         (USP)} and {Universidade do Estado do Amazonas} and {Harvard 
                         University} and {University of California} and {University of 
                         California} and {University of California} and {Instituto Nacional 
                         de Pesquisas Espaciais (INPE)} and {Universidade do Estado do 
                         Amazonas (UEAM)} and {Brookhaven National Laboratory} and 
                         {Brookhaven National Laboratory} and {Harvard University} and 
                         {Harvard University}",
                title = "Isoprene photochemistry over the Amazon rainforest",
              journal = "Proceedings of the National Academy of Sciences of the United 
                         States of America",
                 year = "2016",
               volume = "113",
               number = "22",
                pages = "6125--6130",
                month = "May",
             keywords = "isoprene photochemistry, Amazon, organic hydroperoxides.",
             abstract = "Isoprene photooxidation is a major driver of atmospheric chemistry 
                         over forested regions. Isoprene reacts with hydroxyl radicals (OH) 
                         and molecular oxygen to produce isoprene peroxy radicals (ISOPOO). 
                         These radicals can react with hydroperoxyl radicals (HO2) to 
                         dominantly produce hydroxyhydroperoxides (ISOPOOH). They can also 
                         react with nitric oxide (NO) to largely produce methyl vinyl 
                         ketone (MVK) and methacrolein (MACR). Unimolecular isomerization 
                         and bimolecular reactions with organic peroxy radicals are also 
                         possible. There is uncertainty about the relative importance of 
                         each of these pathways in the atmosphere and possible changes 
                         because of anthropogenic pollution. Herein, measurements of 
                         ISOPOOH and MVK + MACR concentrations are reported over the 
                         central region of the Amazon basin during the wet season. The 
                         research site, downwind of an urban region, intercepted both 
                         background and polluted air masses during the GoAmazon2014/5 
                         Experiment. Under background conditions, the confidence interval 
                         for the ratio of the ISOPOOH concentration to that of MVK + MACR 
                         spanned 0.40.6. This result implies a ratio of the reaction rate 
                         of ISOPOO with HO2 to that with NO of approximately unity. A value 
                         of unity is significantly smaller than simulated at present by 
                         global chemical transport models for this important, nominally 
                         low-NO, forested region of Earth. Under polluted conditions, when 
                         the concentrations of reactive nitrogen compounds were high (>1 
                         ppb), ISOPOOH concentrations dropped below the instrumental 
                         detection limit (<60 ppt). This abrupt shift in isoprene 
                         photooxidation, sparked by human activities, speaks to ongoing and 
                         possible future changes in the photochemistry active over the 
                         Amazon rainforest.",
                  doi = "10.1073/pnas.1524136113",
                  url = "http://dx.doi.org/10.1073/pnas.1524136113",
                 issn = "0027-8424",
                label = "lattes: 0575383574431005 13 LiuBDRSBADKKGGMSSWMM:2016:IsPhOv",
             language = "en",
           targetfile = "liu_isoprene.pdf",
        urlaccessdate = "01 dez. 2020"
}


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