Numerical Simulation of Sea Breeze Convergence over Antarctic Peninsula

Comin, Alcimoni Nelci; Acevedo, Otávio C.

doi:10.1155/2017/7686540

Cited by 3 publications

(3 citation statements)

References 29 publications

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“…The back trajectories in this study are mainly used for the generation of density maps, to indicate the extent of reginal coverage by air masses for each of the flow classifications. At this resolution, sea breezes are expected to not be captured to their full extent, as previous numerical studies of sea breezes have used horizontal resolutions of 3 km (Comin and Acevedo, 2017) and 1 km (Arrillaga et al, 2016).…”

Section: Back Trajectory Analysis and Mean Sea Level Pressure Mapsmentioning

confidence: 99%

Impact of Atmospheric Flow Conditions on Fine Aerosols in Sydney, Australia

Crawford

Cohen

Griffiths

et al. 2017

Aerosol Air Qual. Res.

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We apply a simple objective measure of an airshed's degree of ventilation and determine the impact on PM 2.5 observations at Lucas Heights, Sydney, Australia. We extend the analysis of previous studies, which considered total PM 2.5 , by: using positive matrix factorisation to split the aerosol mass by source type; and using Radon-222 measurements as an independent indicator of ventilation and mixing. For this coastal airshed we found that for 64% of the time, conditions could be classified into four categories: local recirculation (LRC; 15%), stagnation (19.5%), regional recirculation (RRC; 10.9%), or ventilation (18.6%). Mean PM 2.5 concentrations under recirculation (in this study separated into; LRC and RRC) were 33% higher than under stagnation and can be double that of concentrations under ventilation. Since the combination of LRC and RRC events account for around 26% of all events, recirculation effects on PM 2.5 concentrations are significant. However, we found that airshed ventilation doesn't affect PM 2.5 concentrations from all sources evenly. Considering the three main sources of total PM 2.5 at this site (vehicle exhaust 26.3%, secondary sulfate 23.7% and aged industrial sulfur 20.6%), conditions leading to the highest concentrations differ. The highest vehicle exhaust concentrations occur under LRC, the highest aged-industrial-sulphur concentrations occur under RRC, and secondary sulfur had similarly high concentrations under LRC and RRC. Under LRC the concentration from vehicle exhaust can be up to a factor of 3.9 greater than under ventilation. On a seasonal basis, RRC flow is most likely to occur in summer and spring (the warmer months of the year when sea breezes are more likely), whereas LRC conditions are more likely to occur in autumn and winter. These findings support those of previous studies, indicating that re-circulation can have a significant effect on PM 2.5 concentrations in coastal airsheds, and the degree of impact can vary by source type.

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Section: Back Trajectory Analysis and Mean Sea Level Pressure Mapsmentioning

confidence: 99%

Impact of Atmospheric Flow Conditions on Fine Aerosols in Sydney, Australia

Crawford

Cohen

Griffiths

et al. 2017

Aerosol Air Qual. Res.

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“…Muitos estudos foram realizados para investigar o desempenho do modelo WRF na Antártica, para períodos de alguns dias até escalas anuais, como por exemplo, Powers (2007), Tastula & Vihma (2011), Bromwich et al (2013, Comin & Acevedo (2017). Esses autores encontraram para a temperatura a 2 m da superfície uma correlação variando entre 0,51 a 0,90 e REQM entre 1,3 a 8,1°C.…”

Section: Introductionunclassified

Simulação Numérica Regional para a Temperatura do Ar no Continente Antártico

Comin

2021

Anu. Inst. Geoc.

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Este estudo investiga a temperatura do ar no continente Antártico usando o modelo WRF (Weather Research and Forecasting) versão 3.6.1. Para avaliar o desempenho do WRF são analisadas 29 estações meteorológicas, sendo 24 localizadas próximas à costa e 5 no interior do continente, para o período de 1999 a 2018. Em regiões de topografia complexa e de altitude acima de 1450 metros, o WRF apresentou dificuldade em estimar os valores das temperaturas máximas e mínimas. Observou-se uma superestimativa da temperatura mínima, possivelmente devido à dificuldade do WRF em estimar adequadamente a umidade da atmosfera. A camada espessa de neve faz com que o modelo subestime o fluxo de calor do solo, deixando muita energia na superfície que causa um aumento das temperaturas simuladas. O ciclo da temperatura é razoavelmente simulado na maioria das estações, com correlações entre 0,61 a 0,87. Em geral, as simulações com o WRF concordam razoavelmente com as observações, com desvio padrão entre 0,7 e 1,3°C para as estações localizadas entre 180°W a 90°E. Enquanto na região entre 90°E e 180°E, os desvios variam entre 0,6 e 1,4°C. Os resultados mostram, em geral, que as simulações com o WRF podem ser adotadas para preencher a inexistência de dados observados.

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“…Meanwhile, with the help of a nonhydrostatic mesoscale model, Stivar et al showed that lake breezes caused by the differences in the lake-land temperatures had significant effects on the local circulation in the Itaipu Lake area [13]. Recently, the state-of-the-art Weather Research and Forecasting (WRF) model was applied to simulate the complex structures of low atmosphere flow fields [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

An Analysis of the Physical Characteristics of the Summer Low Atmosphere in the Gobi Desert Adjacent to Bosten Lake, Xinjiang, China

Sun

Ning

et al. 2018

Advances in Meteorology

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A month-long field observation campaign was conducted, which covered approximately 100 km 2 of the Gobi Desert area on the southeast bank of Bosten Lake during the summer of 2016. The purpose of the study was to examine the physical characteristics of the low atmosphere over land-lake nonuniform underlying surfaces in the Gobi Desert of northwestern China. The results of the statistical analysis showed that, during the observational period, the average daytime surface horizontal thermal gradient reached up to −0.2 ∘ C/km from the lakeshore to southern Gobi Desert area. The near-surface wind field of the 7 km horizontal extent from the lakeshore was dominated by onshore breezes with average peak wind speeds above 5 m/s. In the atmospheric near-surface layer, an isohumidity layer at a height between 10 and 50 m a.g.l. was observed from 11:00 to 18:00 LST. Also, a case study for the atmospheric boundary layer and local circulation analyses was conducted. The onshore breezes were found to play a major role in the vertical structure of the local atmospheric boundary layer. The numerical simulation results indicated that there was an alternating day-night local circulation in the Bosten Lake area.

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Numerical Simulation of Sea Breeze Convergence over Antarctic Peninsula

Cited by 3 publications

References 29 publications

Impact of Atmospheric Flow Conditions on Fine Aerosols in Sydney, Australia

Impact of Atmospheric Flow Conditions on Fine Aerosols in Sydney, Australia

Simulação Numérica Regional para a Temperatura do Ar no Continente Antártico

An Analysis of the Physical Characteristics of the Summer Low Atmosphere in the Gobi Desert Adjacent to Bosten Lake, Xinjiang, China

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