scholarly journals Impact of Black Carbon on Surface Ozone in the Yangtze River Delta from 2015 to 2018

Atmosphere ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 626
Author(s):  
Yue Tan ◽  
Delong Zhao ◽  
Honglei Wang ◽  
Bin Zhu ◽  
Dongping Bai ◽  
...  
Keyword(s):  
Black Carbon ◽  
Average Rate ◽  
Surface Ozone ◽  
Yangtze River Delta ◽  
Diurnal Variations ◽  
Single Peak ◽  
Pollutant Concentrations ◽  
And Control ◽  
Meteorological Elements ◽  
Peak Pattern

Despite the yearly decline in PM2.5 in China, surface ozone has been rapidly increasing recently, which makes it imperative to coordinate and control both PM2.5 and ozone in the atmosphere. This study utilized the data of pollutant concentrations and meteorological elements during 2015 to 2018 in Nanjing, China to analyze the daily correlation between black carbon and ozone (CBO), and the distribution of the pollutant concentrations under different levels of CBO. Besides, the diurnal variations of pollutant concentrations and meteorological elements under high positive and negative CBO were discussed and compared. The results show that the percentage of positive CBO had been increasing at the average rate of 7.1%/year, and it was 38.7% in summer on average, nearly twice of that in other seasons (19.2%). The average black carbon (BC), PM2.5 and NO2 under positive CBO was lower than those under negative CBO. It is noticeable that the surface ozone began to ascend when CBO was up to 0.2, with PM2.5 and NO2 decreasing and BC remaining steady. Under negative CBO, pollutant concentrations and meteorological elements showed obvious diurnal variations: BC showed a double-peak pattern and surface ozone, PM2.5, SO2 and CO showed single-peak patterns and NO2 showed a trough from 10:00 to 19:00. Wind speed and visibility showed a single-peak pattern with little seasonal difference. Relative humidity rose first, then it lowered and then it rose. Under positive CBO, the patterns of diurnal variations became less obvious, and some of them even showed no patterns, but just fluctuated at a certain level.

Design Policy Driven Development of Chinese Industry

2019 ◽  
Vol 1 (1) ◽  
Author(s):  
Fei HU ◽  
Kun ZHOU ◽  
Hongshi ZHOU
Keyword(s):  
Industrial Design ◽  
Modern Society ◽  
Yangtze River Delta ◽  
Regional Government ◽  
Delta Area ◽  
Chinese Industry ◽  
Design Competition ◽  
The Government ◽  
Macroeconomic Regulation And Control ◽  
And Control

Governments all over the world are paying great attention to economic innovation and the development of design in modern society. They are spending more and more recourses on making rules for Industrial Design Policy and measuring its implementation. As a method to make macroeconomic regulation and control by the government, the effectiveness and importance of design policy has already been widely admitted. In a macro-background of the three turns of Chinese design policy, taking the design policy of Guangdong province as an example, this article will analyze how local/regional government should respond to the national design policy. Based on the investigation and analysis of the winners of the "Guangdong Governor Cup Industrial Design Competition", this paper discusses how industrial design competition as a part of the design policy to support the development of industrial design. After making a comparison with the design policy of the Yangtze River Delta area, this article tries to enhance and perfect the current policy path.

scholarly journals Vertical Structures of Meteorological Elements and Black Carbon at Mt. Tianshan Using an Unmanned Aerial Vehicle System

2021 ◽  
Vol 13 (7) ◽  
pp. 1267
Author(s):  
Honglei Wang ◽  
Ankang Liu ◽  
Zhongxiu Zhen ◽  
Yan Yin ◽  
Bin Li ◽  
...  
Keyword(s):  
Black Carbon ◽  
Unmanned Aerial Vehicle ◽  
Vertical Structure ◽  
Mountain Valley ◽  
Vehicle System ◽  
Aerial Vehicle ◽  
Aerosol Number Concentration ◽  
Vertical Changes ◽  
Meteorological Elements ◽  
East West

As the largest independent east–west-trending mountain in the world, Mt. Tianshan exerts crucial impacts on climate and pollutant distributions in central Asia. Here, the vertical structures of meteorological elements and black carbon (BC) were first derived at Mt. Tianshan using an unmanned aerial vehicle system (UAVS). Vertical changes in meteorological elements can directly affect the structure of the planet boundary layer (PBL). As such, the influences of topography and meteorological elements’ vertical structure on aerosol distributions were explored from observations and model simulations. The mass concentrations of BC changed slightly with the increasing height below 2300 m above sea level (a.s.l.), which significantly increased with the height between 2300–3500 m a.s.l. and contrarily decreased with ascending altitude higher than 3500 m. Topography and mountain–valley winds were found to play important roles in the distributions of aerosols and BC. The prevailing valley winds in the daytime were conducive to pollutant transport from surrounding cities to Mt. Tianshan, where the aerosol number concentration and BC mass concentration increased rapidly, whereas the opposite transport pattern dominated during nighttime.

scholarly journals Seasonal and diurnal variations of black carbon and organic carbon aerosols in Bangkok

2011 ◽  
Vol 116 (D15) ◽  
Author(s):  
L. K. Sahu ◽  
Y. Kondo ◽  
Y. Miyazaki ◽  
Prapat Pongkiatkul ◽  
N. T. Kim Oanh
Keyword(s):  
Organic Carbon ◽  
Black Carbon ◽  
Diurnal Variations ◽  
Seasonal And Diurnal Variations ◽  
Carbon Aerosols

scholarly journals Effects of black carbon and boundary layer interaction on surface ozone in Nanjing, China

2018 ◽  
Author(s):  
Jinhui Gao ◽  
Bin Zhu ◽  
Hui Xiao ◽  
Hanqing Kang ◽  
Chen Pan
Keyword(s):  
Boundary Layer ◽  
Black Carbon ◽  
Physical Process ◽  
Surface Ozone ◽  
Vertical Mixing ◽  
Ozone Pollution ◽  
Model Studies ◽  
Photolysis Rate ◽  
Boundary Layer Interaction ◽  
Physical And Chemical

Abstract. As an important solar-radiation absorbing aerosol, the effect of black carbon (BC) on surface ozone, by influencing photolysis rate, has been widely discussed by offline model studies. However, BC-boundary layer (BL) interactions also influence surface ozone. Using the online model simulations and processes analysis, we demonstrate the significant impact of BC-BL interaction on surface ozone. The absorbing effect of BC heats the air above the BL and suppresses BL development, which eventually leads to changes in the contributions of ozone through chemical and physical processes (photochemistry, vertical mixing, and advection). Different from previous offline model studies, BL suppression leads large amounts of ozone precursors being confined below the BL which offsetting the influence from the reduction of photolysis rate, thus enhancing ozone photochemical formation before noon. Furthermore, the changes in physical process show a more significant influence on surface ozone. The weakened turbulence entrains much less ozone from the overlying ozone-rich air down to surface. As a result, the net contribution of ozone from physical and chemical processes leads to surface ozone reduction before noon. The maximum reduction reaches to 16.4 ppb at 12:00. In the afternoon, the changes in chemical process are small which influence inconspicuously to surface ozone. However, physical process still influences the surface ozone significantly. Due to the delayed development of the BL, less vertically mixed BL continues to show an obvious ozone gradient near the top of the BL. Therefore, more ozone aloft can be entrained down to the surface, offsetting the surface ozone reduction. Comparing all the changes in the contributions of processes, the change in the contribution of vertical mixing plays a more important role in impacting surface ozone. Our results show the great impacts of BC-BL interactions on surface ozone. And more attention should be paid on the mechanism of aerosol-BL interactions when we deal with the ozone pollution control in China.

scholarly journals Formation of the Culture of Working with Information in the Conditions of Distance Learning During the Covid-19 Pandemic

2021 ◽  
pp. 318-333
Author(s):  
Oleksandra Markiv
Keyword(s):  
Distance Learning ◽  
Average Rate ◽  
Evaluation Criteria ◽  
Main Task ◽  
Organizational Model ◽  
Self Assessment ◽  
Formative Stage ◽  
Before And After ◽  
Kyiv Polytechnic Institute ◽  
And Control

The main purpose of the study predetermines the main issue of the article: to show the importance of formation of a culture of working with information among students during distance learning, which means the ability to evaluate, perceive information, prevent manipulation, distinguish truth from falsehood. The main task is to assess the existing and desired level of this competence, to develop an organizational model of its formation which consists of the following components: goals and objectives, pedagogical conditions and evaluation criteria. The model was implemented simultaneously at the Drahomanov National Pedagogical University and National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute” by teachers of humanities in experimental and control groups (16 people) in three stages: ascertaining, formative and final. A questionnaire and a self-assessment map of the formation of the culture of working with information were developed for the ascertaining stage; purposeful work with students was conducted (special tasks, discussion conversations, discussions) at the formative stage the results before and after the experiment were compared at the final stage in particular. Positive dynamics in the experimental group was noted, the average rate of formation increased. The proposed evaluation criteria – motivational, cognitive and activity ones have demonstrated practical value. It is advisable to recommend their use at other faculties. It is concluded that the organizational model is effective. The prospect of the study is the scientific substantiation of the implementation of the model among a wider range of students and the development of a distance specialized course.

scholarly journals Ozone production in the megacities of Tianjin and Shanghai, China: a comparative study

2012 ◽  
Vol 12 (4) ◽  
pp. 9161-9194 ◽  
Author(s):  
L. Ran ◽  
C. S. Zhao ◽  
W. Y. Xu ◽  
M. Han ◽  
X. Q. Lu ◽  
...  
Keyword(s):  
Comparative Study ◽  
Surface Ozone ◽  
Regional Scale ◽  
Yangtze River Delta ◽  
Scientific Basis ◽  
Ozone Production ◽  
Ozone Pollution ◽  
Light Alkenes ◽  
Highly Nonlinear ◽  
Ozone Precursor

Abstract. Rapid economic growth has given rise to a significant increase in ozone precursor emissions in many regions of China, especially in the densely populated North China Plain (NCP) and Yangtze River Delta (YRD). Improved understanding of ozone formation in response to different precursor emissions is imperative to address the highly nonlinear ozone problem and to provide a solid scientific basis for efficient ozone abatement in these regions. A comparative study on ozone photochemical production in summer has thus been carried out in the megacities of Tianjin (NCP) and Shanghai (YRD). Two intensive field campaigns were carried out respectively at an urban and a suburban site of Tianjin, in addition to routine monitoring of trace gases in Shanghai, providing data sets of surface ozone and its precursors including nitrogen oxides (NOx) and various volatile organic compounds (VOCs). Ozone pollution was found to be more severe in Tianjin than in Shanghai during the summer, either based on the frequency or the duration of high ozone events. Such differences might be attributed to the large amount of highly reactive VOC mixture in the Tianjin region. It is found that industry related species like light alkenes were of particular importance in both urban and suburban Tianjin, while in Shanghai aromatics dominate. In general, the ozone problem in Shanghai is on an urban scale. Stringent control policies on local emissions would help reduce the occurrence of high ozone concentrations. By contrast, ozone pollution in Tianjin is a regional problem. Combined efforts to reduce ozone precursor emissions on a regional scale must be undertaken to bring the ozone problem under control.

scholarly journals Pedestrian exposure to black carbon and PM2.5 emissions in urban hot spots: new findings using mobile measurement techniques and flexible Bayesian regression models

2021 ◽  
Author(s):  
Honey Dawn Alas ◽  
Almond Stöcker ◽  
Nikolaus Umlauf ◽  
Oshada Senaweera ◽  
Sascha Pfeifer ◽  
...  
Keyword(s):  
Black Carbon ◽  
Urban Areas ◽  
Measurement Techniques ◽  
Bayesian Regression ◽  
Spatially Resolved ◽  
Pollutant Concentrations ◽  
New Findings ◽  
Mean And Variance ◽  
Instrument Measurement ◽  
Mass Concentrations

Abstract Background Data from extensive mobile measurements (MM) of air pollutants provide spatially resolved information on pedestrians’ exposure to particulate matter (black carbon (BC) and PM2.5 mass concentrations). Objective We present a distributional regression model in a Bayesian framework that estimates the effects of spatiotemporal factors on the pollutant concentrations influencing pedestrian exposure. Methods We modeled the mean and variance of the pollutant concentrations obtained from MM in two cities and extended commonly used lognormal models with a lognormal-normal convolution (logNNC) extension for BC to account for instrument measurement error. Results The logNNC extension significantly improved the BC model. From these model results, we found local sources and, hence, local mitigation efforts to improve air quality, have more impact on the ambient levels of BC mass concentrations than on the regulated PM2.5. Significance Firstly, this model (logNNC in bamlss package available in R) could be used for the statistical analysis of MM data from various study areas and pollutants with the potential for predicting pollutant concentrations in urban areas. Secondly, with respect to pedestrian exposure, it is crucial for BC mass concentration to be monitored and regulated in areas dominated by traffic-related air pollution.

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