Effect of wind speed and relative humidity on atmospheric dust concentrations in semi-arid climates

Csavina, Janae; Field, James A.; Félix, Omar; Corral-Avitia, Alba Yadira; Sáez, A. Eduardo; Betterton, Eric A.

doi:10.1016/j.scitotenv.2014.03.138

Cited by 254 publications

(123 citation statements)

References 29 publications

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“…Xu et al (2011) confirmed the deterministic impact of wind speed and wind direction on the concentration of various trace gases at a suburban site between two mega-cities. Csavina et al (2014) examined dust events in two semi-arid sites and then showed a complex, nonlinear dependence of PM 10 (particulate matter with aerodynamic diameters ≤ 10 µm) on wind speed and relative humidity.…”

Section: Y Zheng Et Al: Impact Of Atmospheric Circulations On Aementioning

confidence: 99%

Impact of atmospheric circulations on aerosol distributions in autumn over eastern China: observational evidence

Zheng

Yang

et al. 2015

Atmos. Chem. Phys.

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Abstract. Regional heavy pollution events in eastern China (110-122 • E, 28-40 • N) are causing serious environmental problems. In this study, the relationship between the degree of regional pollution and the patterns of large-scale atmospheric circulation over eastern China in October is investigated using 10-year (2001-2010) Terra/MODIS aerosol optical depth and NCEP reanalysis data by both case study and composite analysis. Eighteen polluted and 10 clean episodes are selected and categorised into six polluted types and three clean types respectively. Generally speaking, weather patterns such as a uniform surface pressure field in eastern China or a steady straight westerly in the middle troposphere, particularly when being at the rear of the anticyclone at 850 hPa, are typically responsible for heavy pollution events. Meanwhile, clean episodes occur when strong southeastward cold air advection prevails below the middle troposphere or air masses are transported from sea to land. Uniform descending motion prevails over the study region, trapping pollutants in the lower atmosphere. Therefore, the value of vertical velocity averaged from 1000 to 100 hPa and divergence of wind field in the lower troposphere are used in this study to quantify the diffusion conditions in each circulation type. The results reveal that it is often a clean episode when both the mean downward motion (larger than 2.56 × 10 −2 Pa s −1 ) and the divergence of lowlevel winds (larger than 1.79 × 10 −2 s −1 ) are strong. Otherwise, it is more likely to be a polluted episode.

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Section: Y Zheng Et Al: Impact Of Atmospheric Circulations On Aementioning

confidence: 99%

Impact of atmospheric circulations on aerosol distributions in autumn over eastern China: observational evidence

Zheng

Yang

et al. 2015

Atmos. Chem. Phys.

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“…In arid and semi-arid climates of North America (Arizona, New Mexico, California, Utah, Colorado and Texas), dust storms are commonly observed, particularly during the March-May period [109,110]. Several dust episodes can be observed over the southern USA in March 2014, some of them have been discussed and commented in media and press release of scientific institutions only.…”

Section: Dust Outbreaks Over North Americamentioning

confidence: 99%

An Evaluation of the CHIMERE Chemistry Transport Model to Simulate Dust Outbreaks across the Northern Hemisphere in March 2014

et al. 2017

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Abstract:Mineral dust is one of the most important aerosols over the world, affecting health and climate. These mineral particles are mainly emitted over arid areas but may be long-range transported, impacting the local budget of air quality in urban areas. While models were extensively used to study a single specific event, or make a global analysis at coarse resolution, the goal of our study is to simultaneously focus on several affected areas-Europe, North America, Central Asia, east China and the Caribbean area-for a one-month period, March 2014, avoiding any parameter fitting to better simulate a single dust outbreak. The simulation is performed for the first time with the hemispheric version of the CHIMERE model, with a high horizontal resolution (about 10 km). In this study, an overview of several simultaneous dust outbreaks over the Northern Hemisphere is proposed to assess the capability of such modeling tools to predict dust pollution events. A quantitative and qualitative evaluation of the most striking episodes is presented with comparisons to satellite data, ground based particulate matter and calcium measurements. Despite some overestimation of dust concentrations far from emission source areas, the model can simulate the timing of the arrival of dust outbreaks on observational sites. For instance, several spectacular dust storms in the US and China are rather well captured by the models. The high resolution provides a better description and understanding of the orographic effects and the long-range transport of dust plumes.

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“…The high PM 2.5 mass concentration usually appeared with the higher relative humidity, windless and less rainfall weather, authors can found that three highest concentration days during observation period, all related with these meteorological factors. Higher RH was often associated with windless, cloudy, and insufficiently sunny days, which aggravated the accumulation and chemical reaction of pollutants [14].…”

Section: Relationship Between Major Components Of Pm 25 and Meteorolmentioning

confidence: 99%

The Relationship between Major Components of PM2.5 and Meteorological Factors in Urban Tokyo, Japan

Ping¹,

Hasegawa²

2017

JESE-B

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Abstract:In this research, the main purpose is to estimate the variation of PM 2.5 mass concentration and study the influence of meteorological characteristics on major components of PM 2.5 concentrations in urban Tokyo, Japan. The results shown that the annual mean mass concentration of PM 2.5 in urban Tokyo was higher than JEQS (Japanese Environmental Quality Standard) of the MOEJ (Ministry of the Environment Japan) (15 μg/m 3 ), and 41.1% of the daily PM 2.5 mass concentration exceeded the annual JEQS concentration during observation period. The major components of PM 2.5 including SO 4 2− , NO 3 − , NH 4 + , OC and EC were tightly related to the meteorological conditions, the correlations results shown that the wind speed and relative humidity had significant correlations with major components of PM 2.5 than the other meteorological factors. Higher relative humidity, windless and less rainfall conditions were favorable for elimination of PM 2.5 concentration. Higher temperature was beneficial to the formation of SO 4 2-, but higher temperature and stronger sunshine duration were not conducive to the formation of NO 3 -.

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Effect of wind speed and relative humidity on atmospheric dust concentrations in semi-arid climates

Cited by 254 publications

References 29 publications

Impact of atmospheric circulations on aerosol distributions in autumn over eastern China: observational evidence

Impact of atmospheric circulations on aerosol distributions in autumn over eastern China: observational evidence

An Evaluation of the CHIMERE Chemistry Transport Model to Simulate Dust Outbreaks across the Northern Hemisphere in March 2014

The Relationship between Major Components of PM2.5 and Meteorological Factors in Urban Tokyo, Japan

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