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RISS 인기검색어
- 검색키워드
- 저자 : Yukiyo Okazaki (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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Benitez-Garcia, Sandy E.,Kanda, Isao,Okazaki, Yukiyo,Wakamatsu, Shinji,Basaldud, Roberto,Horikoshi, Nobuji,Ortinez, Jose A.,Ramos-Benitez, Victor R.,Cardenas, Beatriz Korean Society for Atmospheric Environment 2015 Asian Journal of Atmospheric Environment (AJAE) Vol.9 No.2
In the Mexico City Metropolitan Area (MCMA), ozone ($O_3$) concentration is still higher than in other urban areas in developed countries. In order to reveal the current state of photochemical air pollution and to provide data for validation of chemical transport models, vertical profiles of meteorological parameters and ozone concentrations were measured by ozonesonde in two field campaigns: the first one, during the change of season from wet to dry-cold (November 2011) and the second during the dry-warm season (March 2012). Unlike previous similar field campaigns, ozonesonde was launched twice daily. The observation data were used to analyze the production and distribution of ozone in the convective boundary layer. The observation days covered a wide range of meteorological conditions, and various profiles were obtained. The evolution of the mixing layer (ML) height was analyzed, revealing that ML evolution was faster during daytime in March 2012 than in November 2011. On a day in November 2011, the early-morning strong wind and the resulting vertical mixing was observed to have brought the high-ozone-concentration air-mass to the ground and caused relatively high surface ozone concentration in the morning. The amount of produced ozone in the MCMA was estimated by taking the difference between the two profiles on each day. In addition to the well-known positive correlation between daily maximum temperature and ozone production, effect of the ML height and wind stagnation was identified for a day in March 2012 when the maximum ground-level ozone concentration was observed during the two field campaigns. The relatively low ventilation coefficient in the morning and the relatively high value in the afternoon on this day implied efficient accumulation of the $O_3$ precursors and rapid production of $O_3$ in the ML.
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Sandy E. Benitez-Garcia,Isao Kanda,Yukiyo Okazaki,Shinji Wakamatsu,Roberto Basaldud,Nobuji Horikoshi,Jose A. Ortinez,Victor R. Ramos-Benitez,Beatriz Cardenas 한국대기환경학회 2015 Asian Journal of Atmospheric Environment (AJAE) Vol.9 No.2
In the Mexico City Metropolitan Area (MCMA), ozone (O3) concentration is still higher than in other urban areas in developed countries. In order to reveal the current state of photochemical air pollution and to provide data for validation of chemical transport models, vertical profiles of meteorological parameters and ozone concentrations were measured by ozonesonde in two field campaigns: the first one, during the change of season from wet to dry-cold (November 2011) and the second during the drywarm season (March 2012). Unlike previous similar field campaigns, ozonesonde was launched twice daily. The observation data were used to analyze the production and distribution of ozone in the convective boundary layer. The observation days covered a wide range of meteorological conditions, and various profiles were obtained. The evolution of the mixing layer (ML) height was analyzed, revealing that ML evolution was faster during daytime in March 2012 than in November 2011. On a day in November 2011, the early-morning strong wind and the resulting vertical mixing was observed to have brought the high-ozone-concentration air-mass to the ground and caused relatively high surface ozone concentration in the morning. The amount of produced ozone in the MCMA was estimated by taking the difference between the two profiles on each day. In addition to the well-known positive correlation between daily maximum temperature and ozone production, effect of the ML height and wind stagnation was identified for a day in March 2012 when the maximum ground-level ozone concentration was observed during the two field campaigns. The relatively low ventilation coefficient in the morning and the relatively high value in the afternoon on this day implied efficient accumulation of the O3 precursors and rapid production of O3 in the ML.
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Isao Kanda,Roberto Basaldud,Nobuji Horikoshi,Yukiyo Okazaki,Sandy-Edith Benítez-Garcia,Abraham Ortínez,Victor Ramos Benítez,Beatriz Cárdenas,Shinji Wakamatsu 한국대기환경학회 2014 Asian Journal of Atmospheric Environment (AJAE) Vol.8 No.3
An abnormal decrease in ozonesonde sensor signaloccurred during air-pollution study campaigns in November2011 and March 2012 in Mexico City MetropolitanArea (MCMA). Sharp drops in sensor signalaround 5 km above sea level and above were observedin November 2011, and a reduction of signal overa broad range of altitude was observed in the convectiveboundary layer in March 2012. Circumstantialevidence indicated that SO2 gas interfered withthe electrochemical concentration cell (ECC) ozonesensors in the ozonesonde and that this interferencewas the cause of the reduced sensor signal output. The sharp drops in November 2011 were attributedto the SO2 plume from Popocatépetl volcano southeastof MCMA. Experiments on the response of theECC sensor to representative atmospheric tracegases showed that only SO2 could cause the observedabrupt drops in sensor signal. The vertical profileof the plume reproduced by a Lagrangian particlediffusion simulation supported this finding. A neargroundreduction in the sensor signal in March 2012was attributed to an SO2 plume from the Tula industrialcomplex north-west of MCMA. Before and atthe time of ozonesonde launch, intermittent high SO2concentrations were recorded at ground-level monitoringstations north of MCMA. The difference betweenthe O3 concentration measured by the ozonesondeand that recorded by a UV-based O3 monitorwas consistent with the SO2 concentration recordedby a UV-based monitor on the ground. The verticalprofiles of the plumes estimated by Lagrangian particlediffusion simulation agreed fairly well with theobserved profile. Statistical analysis of the wind fieldin MCMA revealed that the effect Popocatépetl wasmost likely to have occurred from June to October,whereas the effect of the industries north of MCMA,including the Tula complex, was predicted to occurthroughout the year.
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