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The reaction between CH3O2 and OH radicals: Product yields and atmospheric implications

Journal Article · · Environmental Science and Technology
 [1];  [2];  [3];  [3];  [1];  [1];  [1]
  1. Univ. Lille, Lille (France)
  2. Sandia National Lab. (SNL-CA), Livermore, CA (United States)
  3. Univ. of Leeds, Leeds (United Kingdom)
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The reaction between CH3O2 and OH radicals has been shown to be fast and to play an appreciable role for the removal of CH3O2 radials in remote environments such as the marine boundary layer. Two different experimental techniques have been used here to determine the products of this reaction. The HO2 yield has been obtained from simultaneous time-resolved measurements of the absolute concentration of CH3O2, OH, and HO2 radicals by cw-CRDS. The possible formation of a Criegee intermediate has been measured by broadband cavity enhanced UV absorption. A yield of ΦHO2 = (0.8 ± 0.2) and an upper limit for ΦCriegee = 0.05 has been determined for this reaction, suggesting a minor yield of methanol or stabilized trioxide as a product. The impact of this reaction on the composition of the remote marine boundary layer has been determined by implementing these findings into a box model utilizing the Master Chemical Mechanism v3.2, and constraining the model for conditions found at the Cape Verde Atmospheric Observatory in the remote tropical Atlantic Ocean. Inclusion of the CH3O2+OH reaction into the model results in up to 30% decrease in the CH3O2 radical concentration while the HO2 concentration increased by up to 20%. Finally, production and destruction of O3 are also influenced by these changes, and the model indicates that taking into account the reaction between CH3O2 and OH leads to a 6% decrease of O3.

Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1343626
Report Number(s):
SAND--2017-1088J; 650902
Journal Information:
Environmental Science and Technology, Journal Name: Environmental Science and Technology Journal Issue: 4 Vol. 51; ISSN 0013-936X
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (19)

A vacuum ultraviolet photoionization time-of-flight mass spectrometer with high sensitivity for study of gas-phase radical reaction in a flow tube journal December 2018
Experimental determination of the rate constants of the reactions of HO 2  + DO 2 and DO 2  + DO 2 journal December 2019
Atmospheric Acetaldehyde: Importance of Air‐Sea Exchange and a Missing Source in the Remote Troposphere journal May 2019
Exploring Oxidation in the Remote Free Troposphere: Insights From Atmospheric Tomography (ATom) journal January 2020
The reaction of hydroxyl and methylperoxy radicals is not a major source of atmospheric methanol journal October 2018
Criegee intermediates and their impacts on the troposphere journal January 2018
Tropospheric oxidation of methyl hydrotrioxide (CH 3 OOOH) by hydroxyl radical journal January 2018
Mechanism and kinetics of the atmospheric reaction of 1,3,5-trimethylbenzene bicyclic peroxy radical with OH journal January 2019
ROOOH: A missing piece of the puzzle for OH measurements in low-NO environments? text January 2019
Atmospheric oxidation in the presence of clouds during the Deep Convective Clouds and Chemistry (DC3) study journal January 2018
Impacts of bromine and iodine chemistry on tropospheric OH and HO2: comparing observations with box and global model perspectives journal January 2018
Global modelling of the total OH reactivity: investigations on the “missing” OH sink and its atmospheric implications journal January 2018
ROOOH: a missing piece of the puzzle for OH measurements in low-NO environments? journal January 2019
Estimation of rate coefficients and branching ratios for reactions of organic peroxy radicals for use in automated mechanism construction journal January 2019
Organic peroxy radical chemistry in oxidation flow reactors and environmental chambers and their atmospheric relevance journal January 2019
Impacts of bromine and iodine chemistry on tropospheric OH and HO2: Comparing observations with box and global model perspectives journal October 2017
Atmospheric Oxidation in the Presence of Clouds during the Deep Convective Clouds and Chemistry (DC3) Study journal March 2018
The community atmospheric chemistry box model CAABA/MECCA-4.0 journal January 2019
Chemistry and deposition in the Model of Atmospheric composition at Global and Regional scales using Inversion Techniques for Trace gas Emissions (MAGRITTE v1.1) – Part 1: Chemical mechanism journal January 2019

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