Use este identificador para citar ou linkar para este item: http://repositorio.inpa.gov.br/handle/123/3600
Título: Highly reactive light-dependent monoterpenes in the Amazon
Autor(es): JARDINE, A. B.
Jeffrey Q Chambers
JARDINE, K. J.
FUENTES, J. D.
MARTIN, S. T.
MARTINS, G.
DURGANTE, F.
CARNEIRO, V.
Niro Higuchi
MANZI, A. O.
Assunto: Carbono
Ecofisiologia
ISSN: 0094-8276
Revista: Geophysical Research Letters
Volume: 42
Resumo: Despite orders of magnitude difference in atmospheric reactivity and great diversity in biological functioning, little is known about monoterpene speciation in tropical forests. Here we report vertically resolved ambient air mixing ratios for 12 monoterpenes in a central Amazon rainforest including observations of the highly reactive cis--ocimene (160ppt), trans--ocimene (79ppt), and terpinolene (32ppt) which accounted for an estimated 21% of total monoterpene composition yet 55% of the upper canopy monoterpene ozonolysis rate. All 12 monoterpenes showed a mixing ratio peak in the upper canopy, with three demonstrating subcanopy peaks in 7 of 11 profiles. Leaf level emissions of highly reactive monoterpenes accounted for up to 1.9% of photosynthesis confirming light-dependent emissions across several Amazon tree genera. These results suggest that highly reactive monoterpenes play important antioxidant roles during photosynthesis in plants and serve as near-canopy sources of secondary organic aerosol precursors through atmospheric photooxidation via ozonolysis.
URI: http://repositorio.inpa.gov.br/handle/123/3600
ISSN: 0094-8276
DOI: https://dx.doi.org/10.1002/2014gl062573
Aparece nas coleções:Coordenação de Dinâmica Ambiental (CDAM)

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