2013
DOI: 10.5194/acp-13-9695-2013
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A comparison of atmospheric composition using the Carbon Bond and Regional Atmospheric Chemistry Mechanisms

Abstract: Abstract. We incorporate the recently developed Regional Atmospheric Chemistry Mechanism (version 2, RACM2) into the Community Multiscale Air Quality modeling system for comparison with the existing 2005 Carbon Bond mechanism with updated toluene chemistry (CB05TU). Compared to CB05TU, RACM2 enhances the domain-wide monthly mean hydroxyl radical concentrations by 46 % and nitric acid by 26 %. However, it reduces hydrogen peroxide by 2 %, peroxyacetic acid by 94 %, methyl hydrogen peroxide by 19 %, peroxyacetyl… Show more

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Cited by 51 publications
(60 citation statements)
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“…2.4.3, the RACM2 is also available as an alternate and more detailed representation of gas-phase atmospheric chemistry for hemispheric-scale CMAQ applications. A detailed comparison of the CB05TU and RACM2 predictions for regional scale applications over the continental United States was described in Sarwar et al (2013). A brief summary of comparisons of tropospheric O 3 predictions using the two mechanisms in hemispheric CMAQ is presented in Fig.…”
Section: Comparison Of O 3 Predictions Using the Racm And Cb05 Mechanmentioning
confidence: 99%
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“…2.4.3, the RACM2 is also available as an alternate and more detailed representation of gas-phase atmospheric chemistry for hemispheric-scale CMAQ applications. A detailed comparison of the CB05TU and RACM2 predictions for regional scale applications over the continental United States was described in Sarwar et al (2013). A brief summary of comparisons of tropospheric O 3 predictions using the two mechanisms in hemispheric CMAQ is presented in Fig.…”
Section: Comparison Of O 3 Predictions Using the Racm And Cb05 Mechanmentioning
confidence: 99%
“…Important enhancements to CB05TU were implemented to improve (1) its ability to represent multi-day chemistry associated with cycling of NO x through reservoir organic nitrate species in the mechanism and (2) representation of chemical sinks for tropospheric O 3 due to halogen-mediated chemistry in marine environments. Additionally, the more detailed RACM2 mechanism has also been implemented (Sarwar et al, 2013) to facilitate its use in follow-on hemispheric applications.…”
Section: Enhancements To Gas-phase Chemistrymentioning
confidence: 99%
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“…Because O 3 is a harmful pollutant and a greenhouse gas, there have been numerous efforts aimed at improving O 3 predictions in air quality models, i.e., through a better characterization of the emissions of O 3 precursors (Brioude et al, 2013), more detailed chemical mechanisms (Carter, 2010;Sarwar et al, 2013), more realistic lateral boundary conditions (e.g., Tang et al, 2009), and improved representation of meteorological fields with ensemble modeling techniques (Bei et al, 2010;Zhang et al, 2007). A comprehensive review of the current status and challenges of air quality forecasting is given by Zhang et al (2012).…”
Section: Introductionmentioning
confidence: 99%
“…In the past years, a number of field observations, laboratory studies and modeling research have been carried out to investigate the abundance and behavior of peroxides in the atmosphere Mao et al, 2010;Liang et al, 2013a;Sarwar et al, 2013;Epstein et al, 2014;Fischer et al, 2015;Khan et al, 2015). Hydrogen peroxide (H 2 O 2 ), hydroxymethyl hydroperoxide (HMHP, HOCH 2 OOH), methyl hydroperoxide (MHP, CH 3 OOH) and peroxyacetic acid (PAA, CH 3 C(O)OOH) are generally determined to be the principal peroxide compounds in the troposphere with their concentrations ranging from pptv (parts per trillion by volume) to ppbv (parts per billion by volume) (Lee et al, 2000;He et al, 2010;Zhang et al, 2010Zhang et al, , 2012.…”
Section: Introductionmentioning
confidence: 99%