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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. Inferring the diurnal variability of OH radical concentrations over the Amazon from BVOC measurements. Sci Rep 2023; 13:14900. [PMID: 37689759 PMCID: PMC10492859 DOI: 10.1038/s41598-023-41748-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Accepted: 08/31/2023] [Indexed: 09/11/2023] Open
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) × 106 molecules 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.
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Affiliation(s)
- A Ringsdorf
- Department of Atmospheric Chemistry, Max Planck Institute for Chemistry, Mainz, Germany.
| | - A Edtbauer
- Department of Atmospheric Chemistry, Max Planck Institute for Chemistry, Mainz, Germany
| | - J Vilà-Guerau de Arellano
- Department of Atmospheric Chemistry, Max Planck Institute for Chemistry, Mainz, Germany
- Meteorology and Air Quality Section, Wageningen University, Wageningen, The Netherlands
| | - E Y Pfannerstill
- Department of Atmospheric Chemistry, Max Planck Institute for Chemistry, Mainz, Germany
| | - S Gromov
- Department of Atmospheric Chemistry, Max Planck Institute for Chemistry, Mainz, Germany
| | - V Kumar
- Satellite Remote Sensing Group, Max Planck Institute for Chemistry, Mainz, Germany
| | - A Pozzer
- Department of Atmospheric Chemistry, Max Planck Institute for Chemistry, Mainz, Germany
| | - S Wolff
- Department of Atmospheric Chemistry, Max Planck Institute for Chemistry, Mainz, Germany
| | - A Tsokankunku
- Department of Atmospheric Chemistry, Max Planck Institute for Chemistry, Mainz, Germany
| | - M Soergel
- Department of Atmospheric Chemistry, Max Planck Institute for Chemistry, Mainz, Germany
- Friedrich-Alexander-Universität Erlangen-Nürnberg, Sachgebiet Arbeitssicherheit, Erlangen, Germany
| | - M O Sá
- Instituto Nacional de Pesquisas da Amazônia (INPA), Manaus, CEP 69067-375, Brazil
| | - A Araújo
- Empresa Brasileira de Pesquisa Agropecuária (Embrapa) Amazonia Oriental, Belém, CEP 66095-100, Brazil
| | - F Ditas
- Department of Multiphase Chemistry, Max Planck Institute for Chemistry, Mainz, Germany
- Hessian Agency for Nature Conservation, Environment and Geology, Wiesbaden, Germany
| | - C Poehlker
- Department of Multiphase Chemistry, Max Planck Institute for Chemistry, Mainz, Germany
| | - J Lelieveld
- Department of Atmospheric Chemistry, Max Planck Institute for Chemistry, Mainz, Germany
- Climate and Atmosphere Research Center, The Cyprus Institute, 1645, Nicosia, Cyprus
| | - J Williams
- Department of Atmospheric Chemistry, Max Planck Institute for Chemistry, Mainz, Germany.
- Climate and Atmosphere Research Center, The Cyprus Institute, 1645, Nicosia, Cyprus.
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