Comparison of Lagrangian Process Analysis tools for Eulerian air quality models

Henderson, Barron H.; Kimura, Yosuke; McDonald-Buller, Elena C; Allen, David T.; Vizuete, William

doi:10.1016/j.atmosenv.2011.06.005

Cited by 18 publications

(9 citation statements)

References 23 publications

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“…The PBL average rather than only the surface value is used to account for the fast mixing and airmass exchange within the PBL. The Python Environment for Reaction Mechanisms/Mathematics (PERMM) (Henderson et al, 2010;Henderson et al, 2011) was then used to postprocess the data. PERMM was used to isolate chemical process rates for selected grid cells allowing for tracking of plumes and the evolution of the PBL.…”

Section: The Role Of Different Vocs In Ozone Productionmentioning

confidence: 99%

Chemical Characteristics and Ozone Production in the Northern Colorado Front Range

et al. 2019

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We use the extensive set of aircraft and ground‐based observations from the NSF/National Center for Atmospheric Research (NCAR) and State of Colorado Front Range Air Pollution and Photochemistry Éxperiment and the NASA DISCOVER‐AQ experiments in summer 2014 together with the regional chemical transport model Weather Research and Forecast Model with Chemistry (WRF‐Chem) to study the ozone production and chemical regimes in the Northern Colorado Front Range (NFR). We apply the model's Integrated Reaction Rate capability and chemical tendencies diagnostics and present results from an in‐depth analysis of the ozone formation in various NFR regions for a case study of 12 August 2014. We further apply these diagnostics along a WRF online trajectory to assess the chemical evolution of an airmass during transport. The results show efficient ozone production within the NFR driven by the availability of NOx and an abundance of highly reactive volatile organic compound and also continued ozone production during the transport into the mountains. We identify CO, formaldehyde, higher alkanes, acetaldehyde, and isoprene among the volatile organic compound species with the highest efficiency in ozone production. Formaldehyde and acetaldehyde concentrations in the NFR have a significant contribution from photochemical production, which in turn is linked back to methane oxidation and to emissions of higher alkanes, isoprene, ethane, and propane. This study provides valuable policy information into the chemical fingerprint of surface ozone in the NFR, an area that is in nonattainment of the U.S. EPA ozone health standards and demonstrates the capability of the newly added diagnostic tool in WRF‐Chem to address the drivers behind secondary production of pollutants in greater detail.

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Section: The Role Of Different Vocs In Ozone Productionmentioning

confidence: 99%

Chemical Characteristics and Ozone Production in the Northern Colorado Front Range

et al. 2019

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“…(Rice and Koziel, 2015a, b). The principle (trace) components are reported to be αand β-pinene, β-myrcene, dlimonene, cis-ocimene, β-caryophyllene, β-farnesene, and α-humulene (Hood et al, 1973;Turner et al, 1980;Hillig, 2004;Fischedick et al, 2010;Martyny et al, 2013;Marchini et al, 2014;Rice and Koziel, 2015a). The precise mix of chemical species, however, was strongly dependent on strain and the growing conditions (Fischedick et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Potential regional air quality impacts of cannabis cultivation facilities in Denver, Colorado

et al. 2019

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The legal commercialization of cannabis for recreational and medical use has effectively created a new and almost unregulated cultivation industry. In 2018, within the Denver County limits, there were more than 600 registered cannabis cultivation facilities (CCFs) for recreational and medical use, mostly housed in commercial warehouses. Measurements have found concentrations of highly reactive terpenes from the headspace above cannabis plants that, when released in the atmosphere, could impact air quality. Here we developed the first emission inventory for cannabis emissions of terpenes. The range of possible emissions from these facilities was 66-657 t yr −1 of terpenes across the state of Colorado; half of the emissions are from Denver County. Our estimates are based on the best available information and highlight the critical data gaps needed to reduce uncertainties. These realizations of inventories were then used with a regulatory air quality model, developed by the state of Colorado to predict regional ozone impacts. It was found that most of the predicted changes occur in the vicinity of CCFs concentrated in Denver. An increase of 362 t yr −1 in terpene emissions in Denver County resulted in increases of up to 0.34 ppb in hourly ozone concentrations during the morning and 0.67 ppb at night. Model predictions indicate that in Denver County every 1000 t yr −1 increase in terpenes results in 1 ppb increase in daytime hourly ozone concentrations and a maximum daily 8 h average (MDA8) increase of 0.3 ppb. The emission inventories developed here are highly uncertain, but highlight the need for more detailed cannabis and CCF data to fully understand the possible impacts of this new industry on regional air quality.

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“…In recent years, CMAQ-PA has been applied to study the formation and removal of ozone for North America Vizuete et al, 2008;Yu et al, 2009;Henderson et al, 2011], Europe [Gonçalves et al, 2009], and Asia [Xu et al, 2008;Wang et al, 2010]. Khiem et al [2010] used CMAQ-PA to understand the relative impacts of vertical mixing, dry deposition, and chemical reactions on ozone concentrations.…”

Section: Introductionmentioning

confidence: 99%

Modeled aerosol nitrate formation pathways during wintertime in the Great Lakes region of North America

et al. 2014

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Episodic wintertime particle pollution by ammonium nitrate is an important air quality concern across the Midwest U.S. Understanding and accurately forecasting PM 2.5 episodes are complicated by multiple pathways for aerosol nitrate formation, each with uncertain rate parameters. Here, the Community Multiscale Air Quality model (CMAQ) simulated regional atmospheric nitrate budgets during the 2009 LADCO Winter Nitrate Study, using integrated process rate (IPR) and integrated reaction rate (IRR) tools to quantify relevant processes. Total nitrate production contributing to PM 2.5 episodes is a regional phenomenon, with peak production over the Ohio River Valley and southern Great Lakes. Total nitrate production in the lower troposphere is attributed to three pathways, with 57% from heterogeneous conversion of N 2 O 5 , 28% from the reaction of OH and NO 2 , and 15% from homogeneous conversion of N 2 O 5 . TNO 3 formation rates varied day-to-day and on synoptic timescales. Rate-limited production does not follow urban-rural gradients and NO x emissions due, to counterbalancing of urban enhancement in daytime HNO 3 production with nocturnal reductions. Concentrations of HNO 3 and N 2 O 5 and nighttime TNO 3 formation rates have maxima aloft (100-500 m), leading to net total nitrate vertical flux during episodes, with substantial vertical gradients in nitrate partitioning. Uncertainties in all three pathways are relevant to wintertime aerosol modeling and highlight the importance of interacting transport and chemistry processes during ammonium nitrate episodes, as well as the need for additional constraint on the system through field and laboratory experiments.

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Comparison of Lagrangian Process Analysis tools for Eulerian air quality models

Cited by 18 publications

References 23 publications

Chemical Characteristics and Ozone Production in the Northern Colorado Front Range

Chemical Characteristics and Ozone Production in the Northern Colorado Front Range

Potential regional air quality impacts of cannabis cultivation facilities in Denver, Colorado

Modeled aerosol nitrate formation pathways during wintertime in the Great Lakes region of North America

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