Atmospheric Pollution and Fog Frequency in Oxford, 1926–1980

Gómez, Breogán; Smith, Christopher G.

doi:10.1002/j.1477-8696.1984.tb06749.x

Cited by 15 publications

(14 citation statements)

References 5 publications

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“…The days and distribution of visibility >19 km and <10 km in the multi-cities of central Liaoning is shown in Figure 11, classified according to Gomez and Smith [68], which has an inverse correlation in contrast to the MLH.…”

Section: Resultsmentioning

confidence: 99%

The Relationship of PM Variation with Visibility and Mixing-Layer Height under Hazy/Foggy Conditions in the Multi-Cities of Northeast China

Zhao

Che

et al. 2017

IJERPH

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The variations of visibility, PM-mass concentration and mixing-layer height (MLH) in four major urban/industry regions (Shenyang, Anshan, Benxi and Fushun) of central Liaoning in Northeast China are evaluated from 2009 to 2012 to characterize their dynamic effect on air pollution. The annual mean visibilities are about 13.7 ± 7.8, 13.5 ± 6.5, 12.8 ± 6.1 and 11.5 ± 6.8 km in Shenyang, Anshan, Benxi and Fushun, respectively. The pollution load (PM × MLH) shows a weaker vertical diffusion in Anshan, with a higher PM concentration near the surface. High concentrations of fine-mode particles may be partially attributed to the biomass-burning emissions from September in Liaoning Province and surrounding regions in Northeast China as well as the coal burning during the heating period with lower MLH in winter. The visibility on non-hazy fog days is about 2.5–3.0 times higher than that on hazy and foggy days. The fine-particle concentrations of PM2.5 and PM1.0 on hazy and foggy days are ~1.8–1.9 times and ~1.5 times higher than those on non-hazy foggy days. The MLH declined more severely during fog pollution than in haze pollution. The results of this study can provide useful information to better recognize the effects of vertical pollutant diffusion on air quality in the multi-cities of central Liaoning Province in Northeast China.

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Section: Resultsmentioning

confidence: 99%

The Relationship of PM Variation with Visibility and Mixing-Layer Height under Hazy/Foggy Conditions in the Multi-Cities of Northeast China

Zhao

Che

et al. 2017

IJERPH

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“…In Katowice and Kraków fog was clearly related to anticyclonic types with air advection from the southeastern sector (Sa, SEa) and nonadvective types Ca and Ka, while in Latvia (Avotniece et al 2015) the most favourable conditions for fog formation exist during anticyclonic situations with air advection from S, SW and W. Anticyclonic conditions also favoured fog occurrence in Oxford in the winter season (Gomez and Smith 1984). Moreover, the long-term variability of fog frequency in Latvia in the 52-year-long period of 1960-2012 was similar to that in Kraków (Avotniece et al 2015).…”

Section: Discussionmentioning

confidence: 91%

“…Klemm and Lin (2016) found that a change of ten percent in aerosol concentration had about the same effect on fog occurence as a change of 0.1°C in air temperature. Reduction in fog frequency over the last 30 years has been reported for more than 300 stations in Europe (Vautard et al 2009) and other localities (Gomez and Smith 1984;Koepke 1995, 1997;Kokkola et al 2003;Shi et al 2008;Witi and La Dochy 2008;van Oldenborgh et al 2010;Sugimoto et al 2013;Fu et al 2014). An increase in the frequency of fog events due to growing industrial activity and rising atmospheric pollution concentration is observed in India (Singh and Dey 2012;Shrivastava et al 2016) and other parts of South Asia (Syed et al 2012).…”

Section: Discussionmentioning

confidence: 97%

Synoptic climatology of fog in selected locations of southern Poland (1966–2015)

Łupikasza

Niedźwiedź

2016

Bulletin of Geography. Physical Geography Series

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Abstract. This paper investigates fog frequency in southern Poland in relation to various topography (concave and convex forms) and atmospheric circulation types. It also discusses long-term variability in the annual and seasonal number of days with fog. Daily information on fog occurrence was taken from three high quality synoptic stations representing various landforms: Kraków-Balice (bottom of the hollow), Katowice-Muchowiec (Silesian Upland) and Bielsko-Aleksandrowice (summit of Carpathian Foothill). In the central part of southern Poland during the last 50 years fog occurred on average during 53-67 days a year. The annual number of foggy days in Kraków (67 days) located in a structural basin was by 14-15 days higher than in Bielsko (53 days) situated in the Silesian Foothills. In the annual course, high fog occurrence (above 6 days per month) was observed from September to January, with the maximum in Kraków (10 days in October). At every station the monthly minimum of fog occurrence fell in July (2 days). In summer and spring the highest probability of fog occurrence was found on days with anticyclonic types and air advection from the northeastern (Na, NEa) and eastern (Ea, SEa) sectors. In autumn, a high probability was also found for the anticyclonic types with advection of air mass from the eastern and southern sectors. In the Carpathian Foothills (Bielsko) the probability of fog occurrence in winter was significantly enhanced only for the cyclonic types with air advection from the eastern sector (NEc, Ec, SEc) and nonadvective types Cc (cyclone centre) and Bc (cyclonic trough). Trends in the fog frequency were mostly insignificant. The only significant decreasing trend was found in Kraków on the annual scale and in summer when fog frequency was low.

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Section: Introductionmentioning

confidence: 99%

“…With a decrease in aerosol counts, this effect is diminished. Second, increasing air temperatures in the lower atmospheric layers, especially during winter, lead to the fact that the dew point is exceeded less often and so gaseous water vapour generally condenses less frequently to form fog (Gomez and Smith, 1984;Vautard et al, 2009;Avotniece et al, 2015;Łupikasza and Niedźwiedź, 2016;Veljović and Vujović, 2018). Although these studies cover long time periods, they are only based on station data with few measurements per day.…”

Section: Introductionmentioning

confidence: 99%

A spatially explicit and temporally highly resolved analysis of variations in fog occurrence over Europe

Egli

Thies

Bendix

2019

Quart J Royal Meteoro Soc

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Fog plays a major role in many ecological aspects and it influences human life in various ways. In this study, a temporally highly resolved and spatially explicit analysis of variations in fog occurrence was conducted for Europe and links to general weather conditions were investigated. To this end, a high‐resolution fog product based on Meteosat Second Generation data was developed. Characteristic fog distributions were identified by applying a Self Organizing Map approach to the dataset. It was found that the resulting fog patterns are primarily determined by terrain characteristics. Simultaneous occurrences between these patterns and the predominant general weather situations were analyzed. The results show that the general weather situations can be categorized into three main groups, each responsible for the formation of a different group of fog patterns. Additionally, distinct regional differences could be identified in the diurnal and annual fog frequency cycles and the derived region‐specific frequency variations were used to draw conclusions about the fog types prevailing in these regions.

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Atmospheric Pollution and Fog Frequency in Oxford, 1926–1980

Abstract: G is said to occur when the horizontal visibility is reduced to less than loo0 metres.

Cited by 15 publications

References 5 publications

The Relationship of PM Variation with Visibility and Mixing-Layer Height under Hazy/Foggy Conditions in the Multi-Cities of Northeast China

The Relationship of PM Variation with Visibility and Mixing-Layer Height under Hazy/Foggy Conditions in the Multi-Cities of Northeast China

Synoptic climatology of fog in selected locations of southern Poland (1966–2015)

A spatially explicit and temporally highly resolved analysis of variations in fog occurrence over Europe

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