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Verfasst von:Herrmann, Maximilian [VerfasserIn]   i
 Gutheil, Eva [VerfasserIn]   i
Titel:Simulation of the air quality in Southern California, USA in July and October of the year 2018
Verf.angabe:Maximilian Herrmann and Eva Gutheil
E-Jahr:2022
Jahr:29 March 2022
Umfang:21 S.
Fussnoten:Gesehen am 06.04.2022
Titel Quelle:Enthalten in: Atmosphere
Ort Quelle:Basel, Switzerland : MDPI AG, 2010
Jahr Quelle:2022
Band/Heft Quelle:13(2022), 4, Artikel-ID 548, Seite 1-21
ISSN Quelle:2073-4433
Abstract:A numerical investigation of the air quality in Southern California, USA in the year 2018 is presented using the Weather Research and Forecasting model coupled with Chemistry (WRF-Chem). In July, a heat wave occurred, and in October, Santa Ana conditions prevailed; these conditions and their impact on air quality are the scope of the present numerical study.The high spatial resolution in the simulation includes two nested domains of 1 km and 3 km, respectively. Local climate zones land use categories are combined with the complex urban model building effect parameterization coupled with the building energy model (BEP+BEM) and the detailed MOZCART-T1 chemical reaction mechanism, which is the MOZART-T1 mechanism for trace gases with GOCART aerosols. Thus, the model is suitable to compare simulation results to in situ and satellite measurements of O3, NO2, CH4, and CO. The meteorology is captured well by the model. Comparison of simulation results with observations shows a good agreement of NO2 and ozone, whereas CO mixing ratios are generally underestimated. This hints at missing emissions in the 2017 National Emissions Inventory (NEI) dataset. Both the heat wave and the Santa Ana winds increase the air pollution with gas-phase species in Los Angeles. In both cases, nighttime boundary layer heights are small, which causes emissions to reside near the ground. During Santa Ana winds, NOx removal on aerosols is reduced. Methane mixing ratios are modeled very well at most stations in Los Angeles, but predictions of low emissions near the University of California cause inaccuracies at that location. Modeled and observed PM2.5 agree well on low-pollution days, but high-pollution events are generally missed by the model. During the heat wave, both modeled and observed PM2.5 concentrations exceed the recommended NAAQS National Ambient Air Quality Standards value of 12.5 g/m3. The present modeling approach serves as a base for the study and prediction of special weather events and their impact on air pollution.
DOI:doi:10.3390/atmos13040548
URL:kostenfrei: Volltext ; Verlag: https://doi.org/10.3390/atmos13040548
 kostenfrei: Volltext: https://www.mdpi.com/2073-4433/13/4/548
 DOI: https://doi.org/10.3390/atmos13040548
Datenträger:Online-Ressource
Sprache:eng
Sach-SW:air quality
 heat wave
 high resolution
 Los Angeles
 Santa Ana winds
 Southern California
 WRF-Chem
K10plus-PPN:1797786156
Verknüpfungen:→ Zeitschrift
 
 
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