Inferring the diurnal variability of OH radical concentrations over the Amazon from BVOC measurements

Ringsdorf A, Edtbauer A, Vilà-Guerau de Arellano J, Pfannerstill EY, Gromov S, Kumar V, Pozzer A, Wolff S, Tsokankunku A, Soergel M, Sá MO, Araújo A, Ditas F, Poehlker C, Lelieveld J, Williams J (2023)

Publication Type: Journal article

Publication year: 2023

Journal

Scientific Reports Nature Publishing Group: Open Access Journals - Option B

Book Volume: 13

Article Number: 14900

Journal Issue: 1

DOI: 10.1038/s41598-023-41748-4

Abstract

The atmospheric oxidation of biogenic volatile organic compounds (BVOC) by OH radicals over tropical rainforests impacts local particle production and the lifetime of globally distributed chemically and radiatively active gases. For the pristine Amazon rainforest during the dry season, we empirically determined the diurnal OH radical variability at the forest-atmosphere interface region between 80 and 325 m from 07:00 to 15:00 LT using BVOC measurements. A dynamic time warping approach was applied showing that median averaged mixing times between 80 to 325 m decrease from 105 to 15 min over this time period. The inferred OH concentrations show evidence for an early morning OH peak (07:00–08:00 LT) and an OH maximum (14:00 LT) reaching 2.2 (0.2, 3.8) × 106molecules cm−3 controlled by the coupling between BVOC emission fluxes, nocturnal NOx accumulation, convective turbulence, air chemistry and photolysis rates. The results were evaluated with a turbulence resolving transport (DALES), a regional scale (WRF-Chem) and a global (EMAC) atmospheric chemistry model.

Involved external institutions

Max-Planck-Institut für Chemie (Otto Hahn Institut) / Max Planck Institute for Chemistry DE Germany (DE) INPA - National Institute for Amazonian Research BR Brazil (BR) Empresa Brasileira de Pesquisa Agropecuária BR Brazil (BR)

How to cite

APA:

Ringsdorf, A., Edtbauer, A., Vilà-Guerau de Arellano, J., Pfannerstill, E.Y., Gromov, S., Kumar, V.,... Williams, J. (2023). Inferring the diurnal variability of OH radical concentrations over the Amazon from BVOC measurements. Scientific Reports, 13(1). https://dx.doi.org/10.1038/s41598-023-41748-4

MLA:

Ringsdorf, A., et al. "Inferring the diurnal variability of OH radical concentrations over the Amazon from BVOC measurements." Scientific Reports 13.1 (2023).

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