Observational evidence for the impact of the lake breeze circulation on ozone concentrations in Southern Ontario

Hastie, D. R.; Narayan, J.; Schiller, C. L.; Niki, H.; Shepson, P. B.; Sills, David; Taylor, Peter A.; Moroz, W. J.; Drummond, J.W.; Reid, N.; Taylor, Ron; Roussel, P.B.; Melo, O.T.

doi:10.1016/s1352-2310(98)00199-x

Cited by 59 publications

(37 citation statements)

References 19 publications

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“…Dynamics at the lake-breeze front have been studied to understand effects on pollutants. Hastie et al (1999) noted that the arrival of the lake breeze coincided with maximum trace gas concentrations with rapid decreases behind the front suggesting that vertical mixing generated by the front could result in entrainment of cleaner air from above the inflow layer. Kitada and Kitagawa (1990) showed that the vertical profile of pollutants was strongly impacted by the micro-scale features of the sea breeze such as the transport of pollutants in the downdraft behind the front and suggested that the most aged air mass would be found in the upper part of the circulation behind the front.…”

Section: Distribution and Evolution Of Trace Gases And Particlesmentioning

confidence: 99%

“…Specifically, a number of studies have been conducted in the Great Lakes area to examine lake breezes and their influence on air quality (e.g. Biggs and Graves, 1962;Lyons, 1972;Lyons and Cole, 1976;Reid et al, 1996;Sills 1998;Hastie et al, 1999). The region of southwestern Ontario often experiences poor air quality due to elevated O 3 and particulate matter (PM) concentrations (OME, 2008).…”

Section: Introductionmentioning

confidence: 99%

“…The impact of the lakes and their associated lake-breeze circulations has been a complicating factor in elucidating chemical processes on a fine spatial scale in this region. For example, aircraft measurements showed that aged, polluted air masses over Lake Ontario were advected over land by lake breezes with abrupt increases in O 3 concentrations, as well as other pollutants such as NO x and PAN (Reid et al, 1996;Hastie et al, 1999). However, the interaction between lake breezes, chemical transport and processes behind the increases is not well understood.…”

Section: Introductionmentioning

confidence: 99%

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Aircraft study of the impact of lake-breeze circulations on trace gases and particles during BAQS-Met 2007

et al. 2011

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Abstract. High time-resolved aircraft data, concurrent surface measurements and air quality model simulations were explored to diagnose the processes influencing aerosol chemistry under the influence of lake-breeze circulations in a polluted region of southwestern Ontario, Canada. The analysis was based upon horizontal aircraft transects conducted at multiple altitudes across an entire lake-breeze circulation. Air mass boundaries due to lake-breeze fronts were identified in the aircraft meteorological and chemical data, which were consistent with the frontal locations determined from surface analyses. Observations and modelling support the interpretation of a lake-breeze circulation where pollutants were lofted at a lake-breeze front, transported in the synoptic flow, caught in a downdraft over the lake, and then confined by onshore flow. The detailed analysis led to the development of conceptual models that summarize the complex 3-D circulation patterns and their interaction with the synoptic flow. The identified air mass boundaries, the interpretation of the lake-breeze circulation, and the air parcel circulation time in the lake-breeze circulation (3.0 to 5.0 h) enabled formation rates of organic aerosol (OA/ CO) and SO 2− 4 to be determined. The formation rate for OA (relative to excess CO in ppmv) was found to be 11.6-19.4 µg m −3 ppmv −1 h −1 and the SO 2− 4 formation rate was 5.0-8.8 % h −1 . The formation rates are enhanced relative to regional background rates implying that lake-breeze circulations are an important dynamic in the formation of SO 2− 4 and secondary organicCorrespondence to: K. L. Hayden (katherine.hayden@ec.gc.ca) aerosol. The presence of cumulus clouds associated with the lake-breeze fronts suggests that these enhancements could be due to cloud processes. Additionally, the effective confinement of pollutants along the shoreline may have limited pollutant dilution leading to elevated oxidant concentrations.

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Section: Distribution and Evolution Of Trace Gases And Particlesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Aircraft study of the impact of lake-breeze circulations on trace gases and particles during BAQS-Met 2007

et al. 2011

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“…Some of this early work (e.g., Yap et al, 1988) suggested that local impacts on ozone levels were generally small, while some noted a more significant impact (Mukammal et al, 1982(Mukammal et al, , 1985. Ozone concentration increases of 30 ppbv over the course of a few minutes were linked through surface station and satellite observations to the passage of a lake-breeze front in a later, more detailed analysis (Hastie et al, 1999). Time-coincident aircraft measurements of precursor NO x and VOCs suggested that the air mass associated with the ozone maximum was well-aged and had moved inland from a position originating over Lake Ontario.…”

Section: Introductionmentioning

confidence: 99%

Mass tracking for chemical analysis: the causes of ozone formation in southern Ontario during BAQS-Met 2007

et al. 2010

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Abstract.A three-level nested regional air pollution model has been used to study the processes leading to high ozone concentrations in the southern Great Lakes region of North America. The highest resolution simulations show that complex interactions between the lake-breeze circulation and the synoptic flow lead to significant enhancements in the photochemical production and transport of ozone at the local scale. Mass tracking of individual model processes show that Lakes Erie and St. Clair frequently act as photochemical ozone production regions, with average mid-day production rates of up to 3 ppbv per hour. Enhanced ozone levels are evident over these two lakes in 23-day-average surface ozone fields. Analysis of other model fields and aircraft measurements suggests that vertical circulation enhances ozone levels at altitudes up to 1500 m over Lake St. Clair, whereas subsidence enhances ozone over Lake Erie in a shallow layer only 250 m deep. Mass tracking of model transport shows that lake-breeze surface convergence zones combined with the synoptic flow can then carry ozone and its precursors hundreds of kilometers from these source areas, in narrow, elongated features. Comparison with surface mesonet ozone observations confirm the presence, magnitude, and timing of these features, which can create local ozone enhancements on the order of 30 ppbv above the regional ozone levels. Sensitivity analyses of model-predicted ozone and HO x concentrations show that most of the region is VOC-limited, and that the secondary oxidation pathways of aromatic hydrocarbons have a key role in setting the region's ozone and HO x levels.

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“…Além disso, a concentração temporal desse poluente é significativamente acompanhada das condições meteorológicas, incluindo a radiação solar, temperatura do ar, umidade relativa, precipitação e velocidade e direção do vento (Hastie et al, 1999;Kovač--Andrić, Brana & Gvozdić, 2009). O O 3 , no nível da superfície, tem efeitos negativos sobre a saúde humana, tais como dor de cabeça, irritação nos olhos, infecção respiratória e inflamação dos pulmões, bem como sobre a agricultura (Ashmore, 2005;Pinto, Blande, Souza, Amnerg & Holopainen, 2010).…”

Section: Introductionunclassified

Impacto De Fatores Meteorológicos Sobre as Concentrações De Ozônio Modelados Por Análise De Séries Temporais E Métodos Estatísticos Multivariados

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Aristone

et al. 2017

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O objetivo desta pesquisa foi de desenvolver um modelo para prever as concentrações de ozônio em função das variáveis climáticas. As medidas de concentração do ozônio foram realizadas na Universidade Federal de Mato Grosso do Sul, utilizando dados do período de janeiro a dezembro de 2014. As variáveis preditoras referentes ao clima (umidade relativa, velocidade do vento, chuva, aeerossóis, índice de claridade, radiação solar global e temperatura) foram cedidas pela CEMTEC-Campo Grande-MS. Foram realizadas análise de componentes principais (PCA) e análise de regressão linear múltipla (MLR) aplicadas a estas séries temporais. As principais relações observadas nestas análises foram então usadas para obter uma equação de regressão que liga as concentrações de ozônio diurnas com parâmetros climáticos. O modelo desenvolvido é capaz de explicar 99% da variabilidade nas concentrações de ozônio de superfície com um erro de 0,2%

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Observational evidence for the impact of the lake breeze circulation on ozone concentrations in Southern Ontario

Cited by 59 publications

References 19 publications

Aircraft study of the impact of lake-breeze circulations on trace gases and particles during BAQS-Met 2007

Aircraft study of the impact of lake-breeze circulations on trace gases and particles during BAQS-Met 2007

Mass tracking for chemical analysis: the causes of ozone formation in southern Ontario during BAQS-Met 2007

Impacto De Fatores Meteorológicos Sobre as Concentrações De Ozônio Modelados Por Análise De Séries Temporais E Métodos Estatísticos Multivariados

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