Synoptic patterns and air mass transport during ozone episodes in northwestern Iberia

Saavedra, Santiago; Rodríguez, Antonio Pérez; Taboada, J. J.; Souto, José A.; Casares, J.J.

doi:10.1016/j.scitotenv.2012.09.014

Cited by 52 publications

(32 citation statements)

References 51 publications

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“…High ozone values under eastern component situations in the Iberian Peninsula have already been described by other authors. The presence of an anticyclone located between the British Isles promote the transport of hot and dry air masses from Central Europe (Saavedra et al, 2012), which foments the formation of this secondary pollutant (Russo et al, 2014).…”

Section: Weather Types and Ozone Concentrationmentioning

confidence: 99%

Surface ozone concentration trends and its relationship with weather types in Spain (2001–2010)

Santurtún

Gonzalez‐Hidalgo

Sánchez-Lorenzo

et al. 2015

Atmospheric Environment

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Section: Weather Types and Ozone Concentrationmentioning

confidence: 99%

Surface ozone concentration trends and its relationship with weather types in Spain (2001–2010)

Santurtún

Gonzalez‐Hidalgo

Sánchez-Lorenzo

et al. 2015

Atmospheric Environment

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“…In some other regions, strong links between the concentration of aerosols and certain synoptic weather condition have already been identified (Demuzere et al, 2009;Saavedra et al, 2012). It has also been revealed that under the circumstances of the same pollutant emission quantity, the ground concentration of pollutants varies directly with different synoptic patterns (Wang et al, 2013).…”

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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“…The application of these criteria resulted in the identification of a set of 61 days, grouped into eight episodes (with duration between 3 and 17 days). These episodes were analysed in detail in terms of synoptic pattern and origin of air masses using backtrajectories produced with the Hybrid Single-Particle Lagrangian Integrated Trajectory model (HYSPLIT model) developed by National Oceanic and Atmospheric Administration Air Resources Laboratory (NOAA-ARL) (Draxler and Hess 1998;Draxler and Hess 1997; http://ready.arl.noaa.gov/HYSPLIT.php), following the methodology previously applied over the Iberian Peninsula by Saavedra et al (2012).…”

Section: Episode Selectionmentioning

confidence: 99%

Air quality plan for ozone: an urgent need for North Portugal

Borrego

Monteiro

Martins

et al. 2015

Air Qual Atmos Health

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Each summer period, ozone concentrations surpass the legislation limits in the north of Portugal, more precisely at the Douro Norte monitoring station. To solve/mitigate this air pollution problem, and respond to the EU requirements, air quality plans were studied and designed. An air quality numerical modelling system was applied, with a source apportionment technique (to the most relevant ozone episodes) to identify the major source regions and the main activity sectors responsible for the ozone values at this site. Modelling results pointed out that the background values contribute with more than 50 % to the ozone concentration measured, followed by transport and residential sectors-the main anthropogenic activities. More regional and transboundary strategies are needed to reduce the background concentrations, besides local actions on road transport and residential combustion at urban regions (e.g., the Porto area).

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Synoptic patterns and air mass transport during ozone episodes in northwestern Iberia

Cited by 52 publications

References 51 publications

Surface ozone concentration trends and its relationship with weather types in Spain (2001–2010)

Surface ozone concentration trends and its relationship with weather types in Spain (2001–2010)

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

Air quality plan for ozone: an urgent need for North Portugal

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