scholarly journals Impacts of atmospheric circulations on aerosol distributions in autumn over eastern China: observational evidences

2015 ◽  
Vol 15 (3) ◽  
pp. 3285-3325 ◽  
Author(s):  
X.-Y. Zheng ◽  
Y.-F. Fu ◽  
Y.-J. Yang ◽  
G.-S. Liu
Keyword(s):  
Eastern China ◽  
Weather Condition ◽  
Reanalysis Data ◽  
East China ◽  
Economic Activities ◽  
Middle Troposphere ◽  
Atmospheric Circulations ◽  
Heavy Pollution ◽  
The Government ◽  
Pollution Events

Abstract. Regional heavy pollution events in East China (110–122° E, 28–40° N) are the main environmental problems recently because of the high urbanization and rapid economic development connected with too much emissions of pollutants. However, appropriate weather condition is another factor which cannot be ignored for these events. In this study, the relationship between regional pollution status and larger scale atmospheric circulations over East China in October is investigated using ten-year (2001–2010) MODIS/Terra aerosol optical depth (AOD) product and the NCEP reanalysis data together with case analysis and composite analysis. Generally, statistics in East China show values of mean AOD vary from 0.3 to 0.9 in October over the region, and larger AOD variances are accompanied with the distribution of higher average AOD. Eighteen pollution episodes (regional mean AOD > 0.6) and ten clean episodes (regional mean AOD < 0.4) are selected and then categorized into six polluted types and three clean types, respectively. Each type represents different weather pattern associated with the combination of lower and upper atmospheric circulation. Generally, the uniform surface pressure field in East China or steady straight westerly in middle troposphere, particularly the rear of anticyclone at 850 hPa, are typical weather patterns responsible for heavy pollution events, while clean episodes occur when strong southeastward cold air advection prevails below the middle troposphere or air masses are transported from sea to the mainland. The above studies are especially useful to the government decision make on balance of economic activities and pollution mitigations.

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

2015 ◽  
Vol 15 (21) ◽  
pp. 12115-12138 ◽  
Author(s):  
X. Y. Zheng ◽  
Y. F. Fu ◽  
Y. J. Yang ◽  
G. S. Liu
Keyword(s):  
Large Scale ◽  
Eastern China ◽  
Lower Troposphere ◽  
Reanalysis Data ◽  
Circulation Type ◽  
Lower Atmosphere ◽  
Study Region ◽  
Middle Troposphere ◽  
Heavy Pollution ◽  
Pollution Events

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 low-level winds (larger than 1.79 × 10−2 s−1) are strong. Otherwise, it is more likely to be a polluted episode.

scholarly journals Aerosol optical characteristics and their vertical distributions under enhanced haze pollution events: effect of the regional transport of different aerosol types over eastern China

2017 ◽  
Author(s):  
Tianze Sun ◽  
Huizheng Che ◽  
Bing Qi ◽  
Yaqiang Wang ◽  
Yunsheng Dong ◽  
...  
Keyword(s):  
Eastern China ◽  
Weather Condition ◽  
Dust Particles ◽  
Hygroscopic Growth ◽  
Emission Layer ◽  
Regional Transport ◽  
Haze Pollution ◽  
Fine Mode ◽  
The Yrd ◽  
Pollution Events

Abstract. The climatological variation of aerosol properties and the planetary boundary layer (PBL) during 2013–2015 over the Yangtze River Delta (YRD) region were investigated by employing ground-based Microwave Pulse Lidar (MPL) and CE-318 sun-photometer observations. Combining MODIS and CALIPSO satellite products, enhanced haze pollution events affected by different types of aerosol over the YRD region were analyzed through vertical structures, spatial distributions, backward trajectories, and the Potential Source Contribution Function (PSCF) model. The results show that aerosols in the YRD are dominated by fine-mode particles, except in March. The aerosol optical depth (AOD) in June and September is higher due to high single scattering albedo (SSA) from hygroscopic growth, but is lower in July and August due to wet deposition from precipitation. The PBL height (PBLH) is greater (means ranging from 1.23 to 1.84 km) and more variable in the warmer months of March to August, due to the stronger diurnal cycle and exchange of heat. Northern fine-mode pollutants are brought to the YRD at a height of 1.5 km. The SSA increases blocking the radiation to the surface, and cooling the surface, thereby weakening turbulence, lowering the PBL, and in turn accelerating the accumulation of pollutants, creating a feedback to the cooling effect. Originated from the deserts in Xinjiang and Inner Mongolia, long-range transported dust masses are seen at heights of about 2 km over the YRD region with an SSA440 nm below 0.84, which heat air and upraise PBL, accelerating the diffusion of dust particles. Regional transport from biomass burning spots to the south of the YRD region bring mixed aerosol particles at a height below 1.5 km, resulting in an SSA440 nm below 0.89. During the winter, the accumulation of local emission layer is facilitated by stable weather condition, staying within the PBL even below 0.5 km.

scholarly journals Warm Cover – Precursory Strong Signals hidden in the Middle Troposphere for Haze Pollution

2021 ◽  
Author(s):  
Xiangde Xu ◽  
Wenyue Cai ◽  
Tianliang Zhao ◽  
Xinfa Qiu ◽  
Wenhui Zhu ◽  
...  
Keyword(s):  
Air Pollution ◽  
Eastern China ◽  
Air Pollutant ◽  
Pollutant Emissions ◽  
Ambient Atmosphere ◽  
Large Area ◽  
Middle Troposphere ◽  
Haze Pollution ◽  
Close Relationship ◽  
Pollution Events

Abstract. Eastern China (EC), located on the downstream region of Tibetan Plateau (TP), is a large area that has become vulnerable to frequent haze. In addition of air pollutant emissions, meteorological conditions were a key inducement for air pollution episodes. Based on the study of the Great Smog of London in 1952 and haze pollution in EC over recent decades, it is found that the abnormal warm cover in the middle troposphere, as a precursory strong signal hidden, could connect to severe air pollution events. The convection and diffusion in the atmospheric boundary layer (ABL) were suppressed by a relatively stable structure of warm cover in the middle troposphere, leading to the ABL height decreases, which were favourable for the accumulation of air pollutants in the ambient atmosphere. The warming TP built the warm cover in the middle troposphere from the plateau to the downstream EC region and even the entire East Asian region. The frequent haze events in EC is connected with a significantly strong warm cover in the interdecadal variability. It is also revealed that a close relationship existed between interannual variations of the TP's heat source and the warm cover hidden in the middle troposphere over EC.

Women Welfare Measures Implemented During DMK Regime

Think India ◽  
2019 ◽  
Vol 22 (3) ◽  
pp. 772-779
Author(s):  
T.Vinsela Jeev
Keyword(s):  
Police Department ◽  
Small Scale ◽  
Economic Activities ◽  
The Poor ◽  
Small Scale Industry ◽  
Poor Women ◽  
The Government ◽  
Physically Challenged ◽  
Self Help Groups ◽  
School Books

During the DMK regime many welfare schemes for implemented for women especially. This schemes for developments for socio and economic activities for women. The poor women, widows, physically challenged were benefited their schemes. The government allotted lot of sewing machines, Free school books, Midday meal schemes, Small scale Industry, Self help groups, Boating supply for fisher mans and many women teachers were appointed in Elementary school, Middle school, High schools. Women’s were appointed in police Department and also so many schemes for the development of socio and economic condition of the poor women people.

PENELITIAN ASPEK PERKOTAAN DUMAI DAN BITUNG DAN KEMUNGKINANNYA SEBAGAI LOKASI KAWASAN EKONOMI KHUSUS DI INDONESIA

2012 ◽  
Vol 11 (1) ◽  
Author(s):  
CB Herman Edyanto
Keyword(s):  
Programming Model ◽  
National Income ◽  
Special Economic Zone ◽  
Good Prospect ◽  
Economic Activities ◽  
Processing Industry ◽  
North Sulawesi ◽  
Job Opportunity ◽  
Economic Zone ◽  
The Government

Special Economic Zone has been introduced as a new approach in Indonesia for regional development purposes on the basic of economic activities concentration. Some countries have run such project as part of national income and thus opening new job opportunity for the local people. A concept for its development need to be established since it also affects to the government’s expenditure. This is a chance for the government to open mind in creating new investment from other countries to Indonesia. Two cities have been chosen as cases of study namely Bitung – north Sulawesi Province and Dumai – Riau Province. The first is known as fish processing industry city whereas the second one is known as CPO processing industry city. This study has proved that Dumai has a good prospect as a special economic zone based on the application of Powersim dynamic programming model for its analysis.

scholarly journals Lifting of Social Distancing Measures: Perspectives From Vietnam

2020 ◽  
pp. 1-3 ◽  
Author(s):  
Trang H.D. Nguyen
Keyword(s):  
Transmission Rate ◽  
The Other ◽  
Economic Recovery ◽  
Economic Activities ◽  
Social Distancing ◽  
Medical Products ◽  
Domestic Tourism ◽  
The Government

ABSTRACT While many nations are struggling to slow the transmission rate of the coronavirus disease 2019 (COVID-19), Vietnam has seen no new locally acquired cases since April 16. After implementing 22 d of nationwide social distancing, on April 23, the government of Vietnam announced the easing of social distancing measures. This allows the country to restart its socio-economic activities in a gradual, prudent manner. Domestic tourism and exports of agricultural and anti-COVID-19 medical products take priority over the other sectors in this postpandemic economic recovery. Importantly, the country needs to stay vigilant on the fight against the disease to prevent a possibility of another outbreak.

“Air pollution arrested not imprisoned”: The impact of laws invoked on Covid-19 city lockdowns

2021 ◽  
Vol 2 (4) ◽  
Author(s):  
Emmanuel Mensah Aboagye ◽  
◽  
Nana Osei Owusu ◽  
Keyword(s):  
Air Pollution ◽  
Environmental Problem ◽  
World Health Organisation ◽  
Developed Countries ◽  
World Health ◽  
Economic Activities ◽  
Global Pandemic ◽  
Depth Study ◽  
The Government ◽  
The Impact

Air pollution continues to be an environmental problem that poses a lot of health risks to the young and aged. Developed countries have invested heavily to curb this environmental problem, causing severe threats to human lives, yet the results do not look convincing. In developing countries, the situation is difficult than they can imagine, resulting in governments borrowing to fight what looks like a lost battle [1-3]. The in-depth study of this environmental menace - air pollution, suggests that the government enacts stringent measures to help fight this battle. This is because air pollution has natural (volcanic eruption) and anthropogenic (human activities) causes. In December 2019, the deadly Coronavirus (Covid-19) outbreak was soon declared as a global pandemic by the World Health Organisation (WHO) [4]. Majority of countries have had their share of the impact of this outbreak. Many countries resorted to city lockdown to strictly control the movement of people and economic activities as recommended by WHO.

scholarly journals Erratum to: Regional Meteorological Patterns for Heavy Pollution Events in Beijing

2018 ◽  
Vol 32 (3) ◽  
pp. 516-516
Author(s):  
Ting You ◽  
Renguang Wu ◽  
Gang Huang ◽  
Guangzhou Fan
Keyword(s):  
Heavy Pollution ◽  
Pollution Events
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