Data/hora: 14/06/2024 04:48:49

Biblioteca(s): | Embrapa Amazônia Oriental.
Data corrente: | 28/02/2019
Data da última atualização: | 25/05/2022
Autoria: | PFANNERSTILL, E. Y.; NÖLSCHER, A. C.; YÁÑEZ-SERRANO, A. M.; BOURTSOUKIDIS, E.; KEBEL, S.; JANSSEN, R. H. H.; TSOKANKUNKU, A.; WOLFF, S.; SÖRGEL, M.; SÁ, M. O.; ARAUJO, A. C. de; WALTER, D.; LAVRIC, J.; DIAS-JUNIOR, C. Q.; KESSELMEIER, J.; WILLIAMS, J.
Afiliação: | Eva Y. Pfannerstill, Max Planck Institute for Chemistry; Anke C. Nölscher, Max Planck Institute for Chemistry; Ana M. Yáñez-Serrano, Max Planck Institute for Chemistry; Efstratios Bourtsoukidis, Max Planck Institute for Chemistry; Stephan Keßel, Max Planck Institute for Chemistry; Ruud H. H. Janssen, Massachusetts Institute of Technology; Anywhere Tsokankunku, Max Planck Institute for Chemistry; Stefan Wolff, Max Planck Institute for Chemistry; Matthias Sörgel, Max Planck Institute for Chemistry; Marta O. Sá, INPA; ALESSANDRO CARIOCA DE ARAUJO, CPATU; David Walter, Max Planck Institute for Chemistry; Jošt Lavric, Max Planck Institute for Chemistry; Cléo Q. Dias-Júnior, IFPA; Jürgen Kesselmeier, Max Planck Institute for Chemistry; Jonathan Williams, Max Planck Institute for Chemistry.
Título: | Total OH reactivity changes over the Amazon rainforest during an El Niño event.
Ano de publicação: | 2018
Fonte/Imprenta: | Frontiers in Forests and Global Change, v. 1, Article 12, Dec. 2018.
DOI: | 10.3389/ffgc.2018.00012
Idioma: | Inglês
Conteúdo: | The 2015/16 El Niño event caused unprecedented drought and warming in the Amazon basin. How tropical forests react to such extreme events in terms of volatile organic compound (VOC) emissions is of interest as the frequency of these events is predicted to increase through climate change. The diverse VOCs emitted can be significant for plants' carbon budgets, influence ozone and particle production, and through their reactivity impact OH concentrations. Total OH reactivity is a directly measureable quantity that gives the reaction frequency of OH radicals with all reactive species in the atmosphere in s?1. Here we present a comparison of the OH reactivity diel cycle from November 2015, i.e., extreme drought and elevated temperatures associated with strong El Niño conditions, with November 2012, a ?normal? El Niño Southern Oscillation (ENSO)-neutral period. Interestingly, the diel maximum of OH reactivity during the El Niño event occurred at sunset instead of, under normal conditions, early afternoon. The absolute total diel OH reactivity, however, did not change significantly. Daytime OH reactivity averages were 24.3 ± 14.5 s?1 in 2012 and 24.6 ± 11.9 s?1 in 2015, respectively. Our findings suggest that a combination of stronger turbulent transport above the canopy with stress-related monoterpene and, possibly, other biogenic volatile organic compound (BVOC) emissions were responsible for the increased reactivity at sunset.
Thesaurus Nal: | Amazonia; El Nino.
Categoria do assunto: | P Recursos Naturais, Ciências Ambientais e da Terra
URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/item/193556/1/ffgc-01-00012.pdf
Registro original: | Embrapa Amazônia Oriental (CPATU)
Exemplares: | CPATU - (55721-1) - UPC - AP - DD -  -  -  - DIS