Isoprene photochemistry over the Amazon rainforest

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Isoprene photochemistry over the Amazon rainforest. / Liu, Yingjun; Brito, Joel; Dorris, Matthew R.; Rivera-Rios, Jean C.; Seco, Roger; Bates, Kelvin H.; Artaxo, Paulo; Duvoisin, Sergio; Keutsch, Frank N.; Kim, Saewung; Goldstein, Allen H.; Guenther, Alex B.; Manzi, Antonio O.; Souza, Rodrigo A. F.; Springston, Stephen R.; Watson, Thomas B.; McKinney, Karena A.; Martin, Scot T.

In: Proceedings of the National Academy of Sciences of the United States of America, Vol. 113, No. 22, 2016, p. 6125-6130.

Research output: Contribution to journal › Journal article › Research › peer-review

Harvard

Liu, Y, Brito, J, Dorris, MR, Rivera-Rios, JC, Seco, R, Bates, KH, Artaxo, P, Duvoisin, S, Keutsch, FN, Kim, S, Goldstein, AH, Guenther, AB, Manzi, AO, Souza, RAF, Springston, SR, Watson, TB, McKinney, KA & Martin, ST 2016, 'Isoprene photochemistry over the Amazon rainforest', Proceedings of the National Academy of Sciences of the United States of America, vol. 113, no. 22, pp. 6125-6130. https://doi.org/10.1073/pnas.1524136113

APA

Liu, Y., Brito, J., Dorris, M. R., Rivera-Rios, J. C., Seco, R., Bates, K. H., Artaxo, P., Duvoisin, S., Keutsch, F. N., Kim, S., Goldstein, A. H., Guenther, A. B., Manzi, A. O., Souza, R. A. F., Springston, S. R., Watson, T. B., McKinney, K. A., & Martin, S. T. (2016). Isoprene photochemistry over the Amazon rainforest. Proceedings of the National Academy of Sciences of the United States of America, 113(22), 6125-6130. https://doi.org/10.1073/pnas.1524136113

Vancouver

Liu Y, Brito J, Dorris MR, Rivera-Rios JC, Seco R, Bates KH et al. Isoprene photochemistry over the Amazon rainforest. Proceedings of the National Academy of Sciences of the United States of America. 2016;113(22):6125-6130. https://doi.org/10.1073/pnas.1524136113

Author

Liu, Yingjun ; Brito, Joel ; Dorris, Matthew R. ; Rivera-Rios, Jean C. ; Seco, Roger ; Bates, Kelvin H. ; Artaxo, Paulo ; Duvoisin, Sergio ; Keutsch, Frank N. ; Kim, Saewung ; Goldstein, Allen H. ; Guenther, Alex B. ; Manzi, Antonio O. ; Souza, Rodrigo A. F. ; Springston, Stephen R. ; Watson, Thomas B. ; McKinney, Karena A. ; Martin, Scot T. / Isoprene photochemistry over the Amazon rainforest. In: Proceedings of the National Academy of Sciences of the United States of America. 2016 ; Vol. 113, No. 22. pp. 6125-6130.

Bibtex

@article{246fc67d2a7744e2a76b64e00f00e2d1,
title = "Isoprene photochemistry over the Amazon rainforest",
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 0.4-0.6. 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.",
keywords = "Amazon, Isoprene photochemistry, Organic hydroperoxides",
author = "Yingjun Liu and Joel Brito and Dorris, {Matthew R.} and Rivera-Rios, {Jean C.} and Roger Seco and Bates, {Kelvin H.} and Paulo Artaxo and Sergio Duvoisin and Keutsch, {Frank N.} and Saewung Kim and Goldstein, {Allen H.} and Guenther, {Alex B.} and Manzi, {Antonio O.} and Souza, {Rodrigo A. F.} and Springston, {Stephen R.} and Watson, {Thomas B.} and McKinney, {Karena A.} and Martin, {Scot T.}",
year = "2016",
doi = "10.1073/pnas.1524136113",
language = "English",
volume = "113",
pages = "6125--6130",
journal = "Proceedings of the National Academy of Sciences of the United States of America",
issn = "0027-8424",
publisher = "The National Academy of Sciences of the United States of America",
number = "22",

}

RIS

TY - JOUR

T1 - Isoprene photochemistry over the Amazon rainforest

AU - Liu, Yingjun

AU - Brito, Joel

AU - Dorris, Matthew R.

AU - Rivera-Rios, Jean C.

AU - Seco, Roger

AU - Bates, Kelvin H.

AU - Artaxo, Paulo

AU - Duvoisin, Sergio

AU - Keutsch, Frank N.

AU - Kim, Saewung

AU - Goldstein, Allen H.

AU - Guenther, Alex B.

AU - Manzi, Antonio O.

AU - Souza, Rodrigo A. F.

AU - Springston, Stephen R.

AU - Watson, Thomas B.

AU - McKinney, Karena A.

AU - Martin, Scot T.

PY - 2016

Y1 - 2016

N2 - 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.

AB - 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.

KW - Amazon

KW - Isoprene photochemistry

KW - Organic hydroperoxides

U2 - 10.1073/pnas.1524136113

DO - 10.1073/pnas.1524136113

M3 - Journal article

C2 - 27185928

AN - SCOPUS:84973163728

VL - 113

SP - 6125

EP - 6130

JO - Proceedings of the National Academy of Sciences of the United States of America

JF - Proceedings of the National Academy of Sciences of the United States of America

SN - 0027-8424

IS - 22

ER -

ID: 234280589