Meteorological overview and plume transport patterns during Cal-Mex 2010

Bei, Naifang; Li, Guohui; Zavala, M.; Barrera, Hugo; Torres, Ricardo; Grütter, Michel; Gutiérrez, Wilfredo; García, Manuel; Ruíz-Suárez, L. G.; Ortínez, Abraham; Guitierrez, Yaneth; Alvarado, Carlos S.; Flores, Israel Santos; Molina, Luisa T.

doi:10.1016/j.atmosenv.2012.01.065

Cited by 43 publications

(27 citation statements)

References 25 publications

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“…and Streptococcus spp. can cause diseases of skin, upper respiratory tract and oral cavity (Cardona, 2003) The prevailing wind in Tijuana is from NW, making eastern Tijuana the receptor of air pollutants (Bei et al, 2013) and also therefore of bioaerosols. Measurement during Cal-Mex 2010 (MayeJune, 2010) demonstrated temporal and spatial variability among the sampling sites, indicating the importance of local sources of bioaerosols.…”

Section: Discussionmentioning

confidence: 99%

Characterization of atmospheric bioaerosols at 9 sites in Tijuana, Mexico

Hurtado

Rodríguez

Lopez

et al. 2014

Atmospheric Environment

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Section: Discussionmentioning

confidence: 99%

Characterization of atmospheric bioaerosols at 9 sites in Tijuana, Mexico

Hurtado

Rodríguez

Lopez

et al. 2014

Atmospheric Environment

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“…Numerous studies have demonstrated that the meteorological conditions play an important role in the formation, transformation, diffusion, transport, and removal of the atmospheric pollutants (e.g., Seaman, 2000; Solomon et al, 2000;de Foy et al, 2005de Foy et al, , 2006Bei et al, 2008Bei et al, , 2012Bei et al, , 2013. When the emissions of pollutants remain invariable, transformations in the chemical state of the atmosphere are principally determined by the meteorological conditions.…”

mentioning

confidence: 99%

“…Since the meteorological fields that affect the air quality are generally closely interrelated and strongly controlled by the synoptic-scale circulation, the circulation classification has been extensively used in environmental studies, especially in the middle and highlatitude regions where local weather conditions are mainly determined by the day-to-day synoptic circulation variability (e.g., Jacobeit, 2010;Huth et al, 2008). For example, Bei et al (2013) have classified the typical synoptic situations and the associated plume transport patterns in the US-Mexico border region along the Pacific Ocean, and they found that the plume transport directions are generally consistent with the prevailing wind directions at 850 hPa. However, only a few studies have been performed to investigate the synoptic weather classification in China (Huth et al, 2008).…”

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confidence: 99%

Typical synoptic situations and their impacts on the wintertime air pollution in the Guanzhong basin, China

Bei

Huang

et al. 2016

Atmos. Chem. Phys.

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Abstract. Rapid industrialization and urbanization have caused severe air pollution in the Guanzhong basin, northwestern China, with heavy haze events occurring frequently in recent winters. Using the NCEP reanalysis data, the large-scale synoptic situations influencing the Guanzhong basin during wintertime of 2013 are categorized into six types to evaluate the contribution of synoptic situations to the air pollution, including "north-low", "southwesttrough", "southeast-high", "transition", "southeast-trough", and "inland-high". The FLEXPART model has been utilized to demonstrate the corresponding pollutant transport patterns for the typical synoptic situations in the basin. Except for "southwest-trough" and "southeast-high" (defined as favorable synoptic situations), the other four synoptic conditions (defined as unfavorable synoptic situations) generally facilitate the accumulation of air pollutants, causing heavy air pollution in the basin. In association with the measurement of PM 2.5 (particulate matter with aerodynamic diameter less than 2.5 µm) in the basin, the unfavorable synoptic situations correspond to high PM 2.5 mass concentrations or poor air quality and vice versa. The same analysis has also been applied to winters of 2008-2012, which shows that the basin was mainly influenced by the unfavorable synoptic situations during wintertime leading to poor air quality. The WRF-CHEM model has further been applied to simulate the selected 6 days representing the typical synoptic situations during the wintertime of 2013, and the results generally show a good agreement between the modeled distributions and variations of PM 2.5 and the corresponding synoptic situations, demonstrating reasonable classification for the synoptic situations in the basin. Detailed meteorological conditions, such as temperature inversion, low-level horizontal wind speed, and planetary boundary layer, all contribute to heavy air pollution events in the basin under unfavorable synoptic conditions. Considering the proportion of occurrence of unfavorable synoptic situations during wintertime, reduction of emissions is the optimum approach to mitigate the air pollution in the Guanzhong basin.

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“…The model has difficulties in simulating the SOA concentrations well, with an IOA and MB of 0.69 and −3.6 µg m −3 , respectively. It is worth noting that many factors influence the SOA simulation, including measurements, meteorology, precursors emissions, and SOA formation mechanisms and treatments (Bei et al, , 2013. The model reasonably tracks the temporal variation of the observed sulfate concentration, but the bias is still large, and the MB and IOA are −1.2 µg m −3 and 0.68, respectively.…”

Section: Synoptic Patterns During the Asm Seasonmentioning

confidence: 99%

Widespread air pollutants of the North China Plain during the Asian summer monsoon season: a case study

Bei

et al. 2018

Atmos. Chem. Phys.

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Abstract. During the Asian summer monsoon season, prevailing southeasterly-southwesterly winds are subject to delivering air pollutants from the North China Plain (NCP) to northeast and northwest China. In the present study, the WRF-CHEM model is used to evaluate contributions of trans-boundary transport of NCP emissions to the air quality in northeast and northwest China during a persistent air pollution episode from 22 to 28 May 2015. The WRF-CHEM model generally performs well in capturing the observed temporal variation and spatial distribution of fine particulate matter (PM 2.5 ), ozone (O 3 ), and NO 2 . The simulated temporal variation of aerosol species is also in good agreement with measurements in Beijing during the episode. Model simulations show that NCP emissions contribute substantially to the PM 2.5 level in Liaoning and Shanxi provinces, the adjacent downwind areas of the NCP, with an average of 24.2 and 13.9 µg m −3 during the episode, respectively. The PM 2.5 contributions in Jilin and Shaanxi provinces are also appreciable, with an average of 9.6 and 6.5 µg m −3 , respectively. The average percentage contributions of NCP emissions to the PM 2.5 level in Liaoning, Jilin, Shanxi, and Shaanxi provinces are 40.6, 27.5, 32.2, and 20.9 %, respectively. The NCP emissions contribute remarkably to the O 3 level in Liaoning province, with an average of 46.5 µg m −3 , varying from 23.9 to 69.5 µg m −3 . The O 3 level in Shanxi province is also influenced considerably by NCP emissions, with an average contribution of 35.1 µg m −3 . The O 3 level in Shanxi province is also influenced considerably by NCP emissions, with an average contribution of 35.1 µg m −3 . The average O 3 contributions of NCP emissions to Jilin and Shaanxi provinces are 28.7 and 20.7 µg m −3 , respectively. The average percentage contributions of NCP emissions to the afternoon O 3 level in Liaoning, Jilin, Shanxi, and Shaanxi provinces are 27.4, 19.5, 21.2, and 15.8 %, respectively. However, the effect of NCP emissions on the air quality in Inner Mongolia is generally insignificant. Therefore, effective mitigation of NCP emissions not only improves the local air quality, but is also beneficial to the air quality in northeast and northwest China during the Asian summer monsoon season.

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Meteorological overview and plume transport patterns during Cal-Mex 2010

Cited by 43 publications

References 25 publications

Characterization of atmospheric bioaerosols at 9 sites in Tijuana, Mexico

Characterization of atmospheric bioaerosols at 9 sites in Tijuana, Mexico

Typical synoptic situations and their impacts on the wintertime air pollution in the Guanzhong basin, China

Widespread air pollutants of the North China Plain during the Asian summer monsoon season: a case study

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