Isoprene photochemistry over the Amazon rainforest
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 hydroxyhydroperoxid...
| Autor principal: | Liu, Yingjun |
|---|---|
| Outros Autores: | Brito, Joel F., Dorris, Matthew R., Rivera-Ríos, Jean C., Seco, Roger, Bates, Kelvin H., Artaxo, Paulo, Duvoisin, Sérgio Jr, Keutsch, Frank N., Kim, Saewung, Goldstein, Allen H., Guenther, Alex B., Manzi, Antônio Ocimar, Souza, Rodrigo Augusto Ferreira de, Springston, Stephen R., Watson, Thomas B., McKinney, Karena A., Martin, Scot T. |
| Grau: | Artigo |
| Idioma: | English |
| Publicado em: |
Proceedings of the National Academy of Sciences of the United States of America
2020
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| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/14869 |
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oai:repositorio:1-14869 |
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oai:repositorio:1-14869 Isoprene photochemistry over the Amazon rainforest Liu, Yingjun Brito, Joel F. Dorris, Matthew R. Rivera-Ríos, Jean C. Seco, Roger Bates, Kelvin H. Artaxo, Paulo Duvoisin, Sérgio Jr Keutsch, Frank N. Kim, Saewung Goldstein, Allen H. Guenther, Alex B. Manzi, Antônio Ocimar Souza, Rodrigo Augusto Ferreira de Springston, Stephen R. Watson, Thomas B. McKinney, Karena A. Martin, Scot T. Acrolein Derivative Isoprene Isoprene Peroxy Radical Ketone Derivative Methacrolein Methylvinyl Ketone Nitric Oxide Nitrogen Derivative Unclassified Drug 1,3 Butadiene Derivative 3-buten-2-one Acrolein Air Pollutant Alkanone Free Radical Hemiterpene Isoprene Methacrylaldehyde Pentane Peroxide Air Pollution Boundary Layer Concentration (parameters) Ionization Isomerization Limit Of Detection Mass Spectrometry Particulate Matter Photochemistry Photooxidation Priority Journal Rainforest Reaction Analysis Urban Area Air Pollutant Analogs And Derivatives Analysis Atmosphere Chemistry Human Oxidation Reduction Reaction Radiation Response Acrolein Air Pollutants Atmosphere Butadienes Butanones Free Radicals Hemiterpenes Humans Nitric Oxide Oxidation-reduction Pentanes Peroxides Photochemistry Rainforest 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 0.4-0.6. 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. 2020-05-07T13:41:11Z 2020-05-07T13:41:11Z 2016 Artigo https://repositorio.inpa.gov.br/handle/1/14869 10.1073/pnas.1524136113 en Volume 113, Número 22, Pags. 6125-6130 Attribution-NonCommercial-NoDerivs 3.0 Brazil http://creativecommons.org/licenses/by-nc-nd/3.0/br/ application/pdf Proceedings of the National Academy of Sciences of the United States of America |
| institution |
Instituto Nacional de Pesquisas da Amazônia - Repositório Institucional |
| collection |
INPA-RI |
| language |
English |
| topic |
Acrolein Derivative Isoprene Isoprene Peroxy Radical Ketone Derivative Methacrolein Methylvinyl Ketone Nitric Oxide Nitrogen Derivative Unclassified Drug 1,3 Butadiene Derivative 3-buten-2-one Acrolein Air Pollutant Alkanone Free Radical Hemiterpene Isoprene Methacrylaldehyde Pentane Peroxide Air Pollution Boundary Layer Concentration (parameters) Ionization Isomerization Limit Of Detection Mass Spectrometry Particulate Matter Photochemistry Photooxidation Priority Journal Rainforest Reaction Analysis Urban Area Air Pollutant Analogs And Derivatives Analysis Atmosphere Chemistry Human Oxidation Reduction Reaction Radiation Response Acrolein Air Pollutants Atmosphere Butadienes Butanones Free Radicals Hemiterpenes Humans Nitric Oxide Oxidation-reduction Pentanes Peroxides Photochemistry Rainforest |
| spellingShingle |
Acrolein Derivative Isoprene Isoprene Peroxy Radical Ketone Derivative Methacrolein Methylvinyl Ketone Nitric Oxide Nitrogen Derivative Unclassified Drug 1,3 Butadiene Derivative 3-buten-2-one Acrolein Air Pollutant Alkanone Free Radical Hemiterpene Isoprene Methacrylaldehyde Pentane Peroxide Air Pollution Boundary Layer Concentration (parameters) Ionization Isomerization Limit Of Detection Mass Spectrometry Particulate Matter Photochemistry Photooxidation Priority Journal Rainforest Reaction Analysis Urban Area Air Pollutant Analogs And Derivatives Analysis Atmosphere Chemistry Human Oxidation Reduction Reaction Radiation Response Acrolein Air Pollutants Atmosphere Butadienes Butanones Free Radicals Hemiterpenes Humans Nitric Oxide Oxidation-reduction Pentanes Peroxides Photochemistry Rainforest Liu, Yingjun Isoprene photochemistry over the Amazon rainforest |
| topic_facet |
Acrolein Derivative Isoprene Isoprene Peroxy Radical Ketone Derivative Methacrolein Methylvinyl Ketone Nitric Oxide Nitrogen Derivative Unclassified Drug 1,3 Butadiene Derivative 3-buten-2-one Acrolein Air Pollutant Alkanone Free Radical Hemiterpene Isoprene Methacrylaldehyde Pentane Peroxide Air Pollution Boundary Layer Concentration (parameters) Ionization Isomerization Limit Of Detection Mass Spectrometry Particulate Matter Photochemistry Photooxidation Priority Journal Rainforest Reaction Analysis Urban Area Air Pollutant Analogs And Derivatives Analysis Atmosphere Chemistry Human Oxidation Reduction Reaction Radiation Response Acrolein Air Pollutants Atmosphere Butadienes Butanones Free Radicals Hemiterpenes Humans Nitric Oxide Oxidation-reduction Pentanes Peroxides Photochemistry Rainforest |
| description |
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 0.4-0.6. 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. |
| format |
Artigo |
| author |
Liu, Yingjun |
| author2 |
Brito, Joel F. Dorris, Matthew R. Rivera-Ríos, Jean C. Seco, Roger Bates, Kelvin H. Artaxo, Paulo Duvoisin, Sérgio Jr Keutsch, Frank N. Kim, Saewung Goldstein, Allen H. Guenther, Alex B. Manzi, Antônio Ocimar Souza, Rodrigo Augusto Ferreira de Springston, Stephen R. Watson, Thomas B. McKinney, Karena A. Martin, Scot T. |
| author2Str |
Brito, Joel F. Dorris, Matthew R. Rivera-Ríos, Jean C. Seco, Roger Bates, Kelvin H. Artaxo, Paulo Duvoisin, Sérgio Jr Keutsch, Frank N. Kim, Saewung Goldstein, Allen H. Guenther, Alex B. Manzi, Antônio Ocimar Souza, Rodrigo Augusto Ferreira de Springston, Stephen R. Watson, Thomas B. McKinney, Karena A. Martin, Scot T. |
| title |
Isoprene photochemistry over the Amazon rainforest |
| title_short |
Isoprene photochemistry over the Amazon rainforest |
| title_full |
Isoprene photochemistry over the Amazon rainforest |
| title_fullStr |
Isoprene photochemistry over the Amazon rainforest |
| title_full_unstemmed |
Isoprene photochemistry over the Amazon rainforest |
| title_sort |
isoprene photochemistry over the amazon rainforest |
| publisher |
Proceedings of the National Academy of Sciences of the United States of America |
| publishDate |
2020 |
| url |
https://repositorio.inpa.gov.br/handle/1/14869 |
| _version_ |
1787144693019049984 |
| score |
11.755432 |