Evaluation of the daytime tropospheric loss of 2-methylbutanal
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Published:2022-03-01
Issue:4
Volume:22
Page:2689-2701
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ISSN:1680-7324
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Container-title:Atmospheric Chemistry and Physics
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language:en
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Short-container-title:Atmos. Chem. Phys.
Author:
Asensio María, Antiñolo MaríaORCID, Blázquez SergioORCID, Albaladejo José, Jiménez Elena
Abstract
Abstract. Saturated aldehydes, e.g. 2-methylbutanal (2 MB,
CH3CH2CH(CH3)C(O)H), are emitted into the atmosphere by
several biogenic sources. The first step in the daytime atmospheric
degradation of 2 MB involves gas-phase reactions initiated by hydroxyl (OH)
radicals, chlorine (Cl) atoms, and/or sunlight. In this work, we report the
rate coefficients for the gas-phase reaction of 2 MB with OH (kOH) and Cl
(kCl), together with the photolysis rate coefficient (J), in the
ultraviolet solar actinic region in Valencia (Spain) at different times of
the day. The temperature dependence of kOH was described in the 263–353 K range by the following Arrhenius expression:
kOH(T)=(8.88±0.41)×10-12 exp[(331±14)/T] cm3 molec.−1 s−1. At 298 K, the reported kOH and
kCl are (2.68±0.07)×10-11 and (2.16±0.32)×10-10 cm3 molec.−1 s−1, respectively. Identification and quantification of
the gaseous products of the Cl reaction and those from the photodissociation
of 2 MB were carried out in a smog chamber by different techniques (Fourier
transform infrared spectroscopy, proton transfer time-of-flight mass
spectrometry, and gas chromatography coupled to mass spectrometry). The
formation and size distribution of secondary organic aerosols formed in the
Cl reaction were monitored by a fast mobility particle sizer spectrometer. A
discussion on the relative importance of the first step in the daytime
atmospheric degradation of 2 MB is presented together with the impact of the
degradation products in marine atmospheres.
Funder
Junta de Comunidades de Castilla-La Mancha Universidad de Castilla-La Mancha
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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