Chemistry and deposition in the Model of Atmospheric composition at Global and Regional scales using Inversion Techniques for Trace gas Emissions (MAGRITTEv1.0). Part A. Chemical mechanism

Müller, Jean-François; Stavrakou, Trissevgeni; Peeters, Jozef

doi:10.5194/gmd-2018-316

Cited by 5 publications

(10 citation statements)

References 97 publications

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“…Thus, in TS2, primary/secondary organic nitrates remain in the gas phase to be lost by other processes such as reaction with OH and photolysis. Consistent with other recent studies (Muller et al, 2018;Bates and Jacob, 2019;Zare et al, 2018), separating terpene tertiary organic nitrates from primary/secondary organic nitrates is clearly important for accurately representing organic nitrate concentrations and fate in the atmosphere (Figure 10).…”

Section: Organic Nitrate Formation and Fatesupporting

confidence: 89%

“…To do this, more complex and updated isoprene and terpene chemistry was added into the default MOZART-TS1 mechanism in CESM2/CAM-Chem creating a new mechanism called MOZART-TS2. TS2 has isoprene chemistry with similar complexity as other recent work (Bates and Jacob, 2019;Muller et al, 2018) and terpene chemistry significantly more complex than past work (Browne et al, 2014;. The TS2 scheme could be easily adapted for use by other models.…”

Section: Uncertainties In Loss Of Organic Nitratesmentioning

confidence: 85%

“…The uncertainties in aerosol uptake of organic nitrates causes the largest impact on simulated MDA8 (Figures 13h-j). Aerosol uptake was only recently identified as an important loss process for organic nitrates Romer et al, 2016;Li et al, 2018;Muller et al, 2018;Bates and Jacob, 2019). If no aerosol uptake is included in TS2, this increases the MDA8 ozone by up to 5.1 ppb (Figure 13h).…”

Section: Uncertainties In Loss Of Organic Nitratesmentioning

confidence: 99%

“…Wolfe et al (2015) used SEAC 4 Rs observations over the Ozark Mountains to estimate an aerosol uptake coefficient for isoprene hydroxy nitrates (γ = 0.02). More recently, Bates and Jacob (2019) increased the tertiary organic nitrate aerosol uptake rate in GEOS-Chem by a factor of 10 compared to previous versions and Muller et al (2018) used an aerosol uptake coefficient of 0.1 for all isoprene tertiary organic nitrates and 0.01 for all terpene organic nitrates.…”

Section: Uncertainties In Loss Of Organic Nitratesmentioning

confidence: 99%

See 3 more Smart Citations

Comprehensive isoprene and terpene chemistry improves simulated surface ozone in the southeastern U.S.

Schwantes¹,

Emmons²,

Barth³

et al. 2019

Preprint

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Abstract. Ozone is a greenhouse gas and air pollutant that is harmful to human health and plants. During the summer in the southeastern U.S., many regional and global models are biased high for surface ozone compared to observations. Past studies have suggested different solutions including the need for updates to model representation of clouds, chemistry, ozone deposition, and emissions of nitrogen oxides (NOx) or biogenic hydrocarbons. Here due to the high biogenic emissions in the southeastern U.S., more comprehensive and updated isoprene and terpene chemistry is added into CESMTM/CAM-chem (Community Earth System Model/Community Atmosphere Model with chemistry) to evaluate the impact of chemistry on simulated ozone. Comparisons of the model results with data collected during the Studies of Emissions Atmospheric Composition, Clouds and Climate Coupling by Regional Surveys (SEAC4RS) field campaign and U.S. EPA CASTNET monitoring stations confirm the updated chemistry improves simulated surface ozone, ozone precursors, and NOx reservoir compounds. The isoprene and terpene chemistry updates reduce the bias in the daily maximum 8-hr average (MDA8) surface ozone by up to 7&#8201;ppb. In the past, terpene oxidation in particular has been ignored or heavily reduced in chemical schemes used in many regional and global models, and this study demonstrates comprehensive isoprene and terpene chemistry is needed to reduce surface ozone model biases. Sensitivity tests were performed in order to evaluate the impact of lingering uncertainties in isoprene and terpene oxidation on ozone. Results suggest that even though isoprene emissions are higher than terpene emissions in the southeastern U.S., remaining uncertainties in isoprene and terpene oxidation have similar impacts on ozone due to lower uncertainties in isoprene oxidation. Additionally, this study identifies the need for further constraints on aerosol uptake of organic nitrates derived from isoprene and terpenes in order to reduce uncertainty in simulated ozone.

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Section: Organic Nitrate Formation and Fatesupporting

confidence: 89%

Section: Uncertainties In Loss Of Organic Nitratesmentioning

confidence: 85%

Section: Uncertainties In Loss Of Organic Nitratesmentioning

confidence: 99%

Section: Uncertainties In Loss Of Organic Nitratesmentioning

confidence: 99%

See 2 more Smart Citations

Comprehensive isoprene and terpene chemistry improves simulated surface ozone in the southeastern U.S.

Schwantes¹,

Emmons²,

Barth³

et al. 2019

Preprint

View full text Add to dashboard Cite

show abstract

“…Typically, the measurements range from the upper troposphere down to close to the surface. These profiles were then completed from the last available altitude by profiles from the chemistry‐transport model IMAGESv2 (Müller, Stavrakou & Peeters ; Müller, Stavrakou, Bauwens, et al, ; Stavrakou et al, ) sampled at the time and location of the aircraft profiles and finally integrated to obtain acetone total columns. Examples of composite aircraft‐IMAGES profiles and further information are provided in Figure S4.…”

Section: Resultsmentioning

confidence: 99%

Acetone Atmospheric Distribution Retrieved From Space

Franco

Clarisse

Stavrakou

et al. 2019

Geophysical Research Letters

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As one of the most abundant oxygenated volatile organic compounds in the atmosphere, acetone (CH3C[O]CH3) influences atmospheric oxidants levels and ozone formation. Here we report the first unambiguous identification of acetone from the nadir‐viewing satellite sounder Infrared Atmospheric Sounding Interferometer (IASI). Via a neural network‐based retrieval approach that was previously applied to the retrieval of other weak absorbers, we obtain daily global acetone retrievals. A first intercomparison with independent measurements is conducted. As the retrieval method is computationally fast, it allowed the full reprocessing of the 2007–2018 IASI time series. Analysis of the retrieved global product and its seasonality suggests that emissions of acetone and precursors from the terrestrial biosphere at Northern Hemisphere middle and high latitudes are the main contributors to the atmospheric acetone abundance, more than year‐round oxidation of anthropogenic isoalkanes. Remarkably, biomass burning does not appear to be a strong global source of acetone.

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Evaluating the Impact of Chemical Complexity and Horizontal Resolution on Tropospheric Ozone Over the Conterminous US With a Global Variable Resolution Chemistry Model

Schwantes

Tilmes

et al. 2022

J Adv Model Earth Syst

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A new configuration of the Community Earth System Model (CESM)/Community Atmosphere Model with full chemistry (CAM-chem) supporting the capability of horizontal mesh refinement through the use of the spectral element (SE) dynamical core is developed and called CESM/CAM-chem-SE. Horizontal mesh refinement in CESM/CAM-chem-SE is unique and novel in that pollutants such as ozone are accurately represented at human exposure relevant scales while also directly including global feedbacks. CESM/ CAM-chem-SE with mesh refinement down to ∼14 km over the conterminous US (CONUS) is the beginning of the Multi-Scale Infrastructure for Chemistry and Aerosols (MUSICAv0). Here, MUSICAv0 is evaluated and used to better understand how horizontal resolution and chemical complexity impact ozone and ozone precursors over CONUS as compared to measurements from five aircraft campaigns, which occurred in 2013. This field campaign analysis demonstrates the importance of using finer horizontal resolution to accurately simulate ozone precursors such as nitrogen oxides and carbon monoxide. In general, the impact of using more complex chemistry on ozone and other oxidation products is more pronounced when using finer horizontal resolution where a larger number of chemical regimes are resolved. Large model biases for ozone near the surface remain in the Southeast US as compared to the aircraft observations even with updated chemistry and finer horizontal resolution. This suggests a need for adding the capability of replacing sections of global emission inventories with regional inventories, increasing the vertical resolution in the planetary boundary layer, and reducing model biases in meteorological variables such as temperature and clouds.Plain Language Summary A new configuration of the Community Earth System Model (CESM)/ Community Atmosphere Model with full chemistry (CAM-chem) supporting the capability of horizontal mesh refinement is developed. This configuration is the beginning of the Multi-Scale Infrastructure for Chemistry and Aerosols, which will create a unified infrastructure to model atmospheric chemistry and aerosols across scales in the Earth system. The capability in CESM/CAM-chem to use grids with horizontal mesh refinement SCHWANTES ET AL.

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Chemistry and deposition in the Model of Atmospheric composition at Global and Regional scales using Inversion Techniques for Trace gas Emissions (MAGRITTEv1.0). Part A. Chemical mechanism

Cited by 5 publications

References 97 publications

Comprehensive isoprene and terpene chemistry improves simulated surface ozone in the southeastern U.S.

Comprehensive isoprene and terpene chemistry improves simulated surface ozone in the southeastern U.S.

Acetone Atmospheric Distribution Retrieved From Space

Evaluating the Impact of Chemical Complexity and Horizontal Resolution on Tropospheric Ozone Over the Conterminous US With a Global Variable Resolution Chemistry Model

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