2020
DOI: 10.5194/acp-20-1341-2020
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A machine learning examination of hydroxyl radical differences among model simulations for CCMI-1

Abstract: Abstract. The hydroxyl radical (OH) plays critical roles within the troposphere, such as determining the lifetime of methane (CH4), yet is challenging to model due to its fast cycling and dependence on a multitude of sources and sinks. As a result, the reasons for variations in OH and the resulting methane lifetime (τCH4), both between models and in time, are difficult to diagnose. We apply a neural network (NN) approach to address this issue within a group of models that participated in the Chemistry-Climate … Show more

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Cited by 34 publications
(45 citation statements)
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“…As shown in Fig.3, negative anomalies of [OH] during El Niño events are dominated by increased OH loss through the reaction with CO in response to enhanced biomass burning (Fig.S3), similar to the conclusions of Rowlinson et al 2019and Nicely et al (2020). During the strong El Niño events in 1982-1983, 1991-1992, and 1997-1998, the OH loss by CO increased by up to 3.4±0.4Tmol yr -1 , 4.5±0.6Tmol yr -1 , and 7.6±0.5Tmol yr -1 , respectively, compared to the mean value of 1980-2010.…”
Section: Factors Controlling Oh Trends and Year-to-year Variabilitysupporting
confidence: 87%
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“…As shown in Fig.3, negative anomalies of [OH] during El Niño events are dominated by increased OH loss through the reaction with CO in response to enhanced biomass burning (Fig.S3), similar to the conclusions of Rowlinson et al 2019and Nicely et al (2020). During the strong El Niño events in 1982-1983, 1991-1992, and 1997-1998, the OH loss by CO increased by up to 3.4±0.4Tmol yr -1 , 4.5±0.6Tmol yr -1 , and 7.6±0.5Tmol yr -1 , respectively, compared to the mean value of 1980-2010.…”
Section: Factors Controlling Oh Trends and Year-to-year Variabilitysupporting
confidence: 87%
“…All CCMI models simulate positive OH trends from 1980 to 2010 after removing the year-to-year variability ( Fig.1, top panel), consistent with previous analyses of CCMI OH fields Nicely et al, 2020) and model results of the Aerosol and Chemistry Model Intercomparison Project (Stevenson et al, 2020). The multi-model mean [OH]GM-CH4 increased by 0.7×10 5 molec cm -3 from 1980 to 2010.…”
Section: Decadal Oh Trends and Year-to-year Variabilitysupporting
confidence: 86%
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“…Also, proxy methods do not allow access to underlying processes as direct chemistry modeling does (Zhao et al, 2019). This paper follows the work of Zhao et al (2019), wherein we analyzed in detail 10 OH fields derived from atmospheric chemistry models considering different chemistry, emissions, and dy- namics (Patra et al, 2011;Szopa et al, 2013;Hegglin and Lamarque, 2015;Morgenstern et al, 2017;Zhao et al, 2019;Terrenoire et al, 2020). We now aim to build on this previous paper to estimate the impact of these OH fields on methane emissions as inferred by an atmospheric 4D variational inversion system.…”
Section: Globalmentioning
confidence: 99%