Inferring the diurnal variability of OH radical concentrations over the Amazon from BVOC measurements.
2023
RINGSDORF, A. | EDTBAUER, A. | ARELLANO, J. V.-G. DE | PFANNERSTILL, E. Y. | GROMOV, S. | KUMAR, V. | POZZER, A. | WOLFF, S. | TSOKANKUNKU, A. | SOERGEL, M. | SÁ, M. O. | ARAUJO, A. C. DE | DITAS, F. | POEHLKER, C. | LELIEVELD, J. | WILLIAMS, J. | A. RINGSDORF, MAX PLANCK INSTITUTE FOR CHEMISTRY; A. EDTBAUER, MAX PLANCK INSTITUTE FOR CHEMISTRY; J. VILÀ-GUERAU DE ARELLANO, MAX PLANCK INSTITUTE FOR CHEMISTRY; E. Y. PFANNERSTILL, MAX PLANCK INSTITUTE FOR CHEMISTRY; S. GROMOV, MAX PLANCK INSTITUTE FOR CHEMISTRY; V. KUMAR, MAX PLANCK INSTITUTE FOR CHEMISTRY; A. POZZER, MAX PLANCK INSTITUTE FOR CHEMISTRY; S. WOLFF, MAX PLANCK INSTITUTE FOR CHEMISTRY; A. TSOKANKUNKU, MAX PLANCK INSTITUTE FOR CHEMISTRY; M. SOERGEL, MAX PLANCK INSTITUTE FOR CHEMISTRY; M. O. SÁ, INSTITUTO NACIONAL DE PESQUISAS DA AMAZÔNIA; ALESSANDRO CARIOCA DE ARAUJO, CPATU; F. DITAS, MAX PLANCK INSTITUTE FOR CHEMISTRY; C. POEHLKER, MAX PLANCK INSTITUTE FOR CHEMISTRY; J. LELIEVELD, MAX PLANCK INSTITUTE FOR CHEMISTRY; J. WILLIAMS, MAX PLANCK INSTITUTE FOR CHEMISTRY.
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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Este registro bibliográfico ha sido proporcionado por Empresa Brasileira de Pesquisa Agropecuária