Unexpected seasonality in quantity and composition of Amazon rainforest air reactivity
The hydroxyl radical (OH) removes most atmospheric pollutants from air. The loss frequency of OH radicals due to the combined effect of all gas-phase OH reactive species is a measureable quantity termed total OH reactivity. Here we present total OH reactivity observations in pristine Amazon rainfore...
| Autor principal: | Nölscher, Anke C. |
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| Outros Autores: | Yáñez-Serrano, Ana Maria, Wolff, Stefan, Araüjo, Alessandro Carioca de, Lavric, J. V., Kesselmeier, Jürgen, Williams, Jonathan C. |
| Grau: | Artigo |
| Idioma: | English |
| Publicado em: |
Nature Communications
2020
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| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/15840 |
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oai:repositorio:1-15840 |
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oai:repositorio:1-15840 Unexpected seasonality in quantity and composition of Amazon rainforest air reactivity Nölscher, Anke C. Yáñez-Serrano, Ana Maria Wolff, Stefan Araüjo, Alessandro Carioca de Lavric, J. V. Kesselmeier, Jürgen Williams, Jonathan C. Isoprene Air Quality Atmospheric Pollution Concentration (composition) Hydroxyl Radical Isoprene Photochemistry Pollutant Removal Pristine Environment Quantitative Analysis Rainforest Reaction Kinetics Seasonality Trace Gas Turbulent Mixing Dry Season Environmental Parameters Environmental Temperature Gas Photochemistry Rainforest Rainforest Air Reactivity Season Seasonal Variation Wet Season Amazonas Brasil The hydroxyl radical (OH) removes most atmospheric pollutants from air. The loss frequency of OH radicals due to the combined effect of all gas-phase OH reactive species is a measureable quantity termed total OH reactivity. Here we present total OH reactivity observations in pristine Amazon rainforest air, as a function of season, time-of-day and height (0-80 m). Total OH reactivity is low during wet (10s-1) and high during dry season (62s-1). Comparison to individually measured trace gases reveals strong variation in unaccounted for OH reactivity, from 5 to 15% missing in wet-season afternoons to mostly unknown (average 79%) during dry season. During dry-season afternoons isoprene, considered the dominant reagent with OH in rainforests, only accounts for ∼20% of the total OH reactivity. Vertical profiles of OH reactivity are shaped by biogenic emissions, photochemistry and turbulent mixing. The rainforest floor was identified as a significant but poorly characterized source of OH reactivity. 2020-05-19T14:25:49Z 2020-05-19T14:25:49Z 2016 Artigo https://repositorio.inpa.gov.br/handle/1/15840 10.1038/ncomms10383 en Volume 7 Attribution-NonCommercial-NoDerivs 3.0 Brazil http://creativecommons.org/licenses/by-nc-nd/3.0/br/ application/pdf Nature Communications |
| institution |
Instituto Nacional de Pesquisas da Amazônia - Repositório Institucional |
| collection |
INPA-RI |
| language |
English |
| topic |
Isoprene Air Quality Atmospheric Pollution Concentration (composition) Hydroxyl Radical Isoprene Photochemistry Pollutant Removal Pristine Environment Quantitative Analysis Rainforest Reaction Kinetics Seasonality Trace Gas Turbulent Mixing Dry Season Environmental Parameters Environmental Temperature Gas Photochemistry Rainforest Rainforest Air Reactivity Season Seasonal Variation Wet Season Amazonas Brasil |
| spellingShingle |
Isoprene Air Quality Atmospheric Pollution Concentration (composition) Hydroxyl Radical Isoprene Photochemistry Pollutant Removal Pristine Environment Quantitative Analysis Rainforest Reaction Kinetics Seasonality Trace Gas Turbulent Mixing Dry Season Environmental Parameters Environmental Temperature Gas Photochemistry Rainforest Rainforest Air Reactivity Season Seasonal Variation Wet Season Amazonas Brasil Nölscher, Anke C. Unexpected seasonality in quantity and composition of Amazon rainforest air reactivity |
| topic_facet |
Isoprene Air Quality Atmospheric Pollution Concentration (composition) Hydroxyl Radical Isoprene Photochemistry Pollutant Removal Pristine Environment Quantitative Analysis Rainforest Reaction Kinetics Seasonality Trace Gas Turbulent Mixing Dry Season Environmental Parameters Environmental Temperature Gas Photochemistry Rainforest Rainforest Air Reactivity Season Seasonal Variation Wet Season Amazonas Brasil |
| description |
The hydroxyl radical (OH) removes most atmospheric pollutants from air. The loss frequency of OH radicals due to the combined effect of all gas-phase OH reactive species is a measureable quantity termed total OH reactivity. Here we present total OH reactivity observations in pristine Amazon rainforest air, as a function of season, time-of-day and height (0-80 m). Total OH reactivity is low during wet (10s-1) and high during dry season (62s-1). Comparison to individually measured trace gases reveals strong variation in unaccounted for OH reactivity, from 5 to 15% missing in wet-season afternoons to mostly unknown (average 79%) during dry season. During dry-season afternoons isoprene, considered the dominant reagent with OH in rainforests, only accounts for ∼20% of the total OH reactivity. Vertical profiles of OH reactivity are shaped by biogenic emissions, photochemistry and turbulent mixing. The rainforest floor was identified as a significant but poorly characterized source of OH reactivity. |
| format |
Artigo |
| author |
Nölscher, Anke C. |
| author2 |
Yáñez-Serrano, Ana Maria Wolff, Stefan Araüjo, Alessandro Carioca de Lavric, J. V. Kesselmeier, Jürgen Williams, Jonathan C. |
| author2Str |
Yáñez-Serrano, Ana Maria Wolff, Stefan Araüjo, Alessandro Carioca de Lavric, J. V. Kesselmeier, Jürgen Williams, Jonathan C. |
| title |
Unexpected seasonality in quantity and composition of Amazon rainforest air reactivity |
| title_short |
Unexpected seasonality in quantity and composition of Amazon rainforest air reactivity |
| title_full |
Unexpected seasonality in quantity and composition of Amazon rainforest air reactivity |
| title_fullStr |
Unexpected seasonality in quantity and composition of Amazon rainforest air reactivity |
| title_full_unstemmed |
Unexpected seasonality in quantity and composition of Amazon rainforest air reactivity |
| title_sort |
unexpected seasonality in quantity and composition of amazon rainforest air reactivity |
| publisher |
Nature Communications |
| publishDate |
2020 |
| url |
https://repositorio.inpa.gov.br/handle/1/15840 |
| _version_ |
1787141134023131136 |
| score |
11.755432 |