scholarly journals Vertical Characteristics of Secondary Aerosols Observed in the Seoul and Busan Metropolitan Areas of Korea during KORUS-AQ and Associations with Meteorological Conditions

Atmosphere ◽  
2021 ◽  
Vol 12 (11) ◽  
pp. 1451
Author(s):  
Jong-Min Kim ◽  
Hyo-Jung Lee ◽  
Hyun-Young Jo ◽  
Yu-Jin Jo ◽  
Cheol-Hee Kim
Keyword(s):  
Metropolitan Area ◽  
Metropolitan Areas ◽  
Northeast Asia ◽  
Ground Level ◽  
Policy Support ◽  
Chemical Components ◽  
Emission Characteristics ◽  
Synoptic Conditions ◽  
Vertical Distributions ◽  
Clean Air

In this study, the chemical components of aerosols observed at ground level and in upper layers during the Korea–United States Air Quality (KORUS-AQ) campaign were analyzed in two representative metropolitan areas of Korea: the Seoul metropolitan area (SMA) and the Busan-containing southeastern metropolitan area (BMA). First, we characterized emissions using the Clean Air Policy Support System (CAPSS) emission statistics, and compared them with both ground- and aircraft-based measurements obtained during the KORUS-AQ campaign. The emission statistics showed that the SMA had higher NOx levels, whereas BMA had significantly higher SO2 levels. Ground-level observations averaged for the summer season also showed SMA–nitrate and BMA–sulfate relationships, reflecting the CAPSS emission characteristics of both areas. However, organic carbon (OC) was higher in BMA than SMA by a factor of 1.7, despite comparable volatile organic compound (VOC) emissions in the two areas. DC-8 aircraft-based measurements showed that, in most cases, nitrogen-rich localities were found in the SMA, reflecting the emission characteristics of precursors in the two sampling areas, whereas sulfur-rich localities in the BMA were not apparent from either ground-based or aircraft observations. KORUS-AQ measurements were classified according to two synoptic conditions, stagnant (STG) and long-range transport (LRT), and the nitrate-to-sulfate (N/S) ratio in both ground and upper layers was higher in the SMA for both cases. Meanwhile, organic aerosols reflected local emissions characteristics in only the STG case, indicating that this stagnant synoptic condition reflect local aerosol characteristics. The LRT case showed elevated peaks of all species at altitudes of 1.0–3.5 km, indicating the importance of LRT processes for predicting and diagnosing aerosol vertical distributions over Northeast Asia. Other chemical characteristics of aerosols in the two metropolitan areas were also compared.

Superstar Cities

2013 ◽  
Vol 5 (4) ◽  
pp. 167-199 ◽  
Author(s):  
Joseph Gyourko ◽  
Christopher Mayer ◽  
Todd Sinai
Keyword(s):  
Metropolitan Area ◽  
Metropolitan Areas ◽  
House Prices ◽  
Aggregate Demand ◽  
House Price ◽  
Lower Income ◽  
Local Factors ◽  
The Past ◽  
Long Run ◽  
Price Appreciation

We document large long-run differences in average house price appreciation across metropolitan areas over the past 50 years, and show they can be explained by an inelastic supply of land in some unique locations combined with an increasing number of highincome households nationally. The resulting high house prices and price-to-rent ratios in those “superstar” areas crowd out lower income households. The same forces generate a similar pattern among municipalities within a metropolitan area. These facts suggest that disparate local house price and income trends can be driven by aggregate demand, not just changes in local factors such as productivity or amenities. (JEL R11, R23, R31, R52)

scholarly journals The Delimitation of Bipolar Metropolitan Area Within the Kujawsko-Pomorskie Region

2014 ◽  
Vol 5 (2) ◽  
pp. 101-122 ◽  
Author(s):  
Mirosław Biczkowski ◽  
Iwona Müller-Frączek ◽  
Joanna Muszyńska ◽  
Michał Bernard Pietrzak ◽  
Justyna Wilk
Keyword(s):  
Data Analysis ◽  
Regional Development ◽  
Metropolitan Area ◽  
Multivariate Data Analysis ◽  
Metropolitan Areas ◽  
Linear Arrangement ◽  
Knowledge Based ◽  
Knowledge Based Economy ◽  
Development Levels ◽  
Dual Core

The objective of the article was to re-define the bipolar metropolitan area within the area of the Kujawsko-Pomorskie region (NUTS 2). Concentration of metropolitan features, as well as socio-economic situations of its communes (NUTS 5) in 2011, and also the dynamics of communes’ development in the period 2009-2011 were considered in the procedure of delimitation. Bydgoszcz and Toruń, as the economically strongest cities in the region, were established as the dual core of the bipolar metropolitan area. It was assumed that the determined metropolitan area would cover the best developed and the fastest developing communes which met the following criteria of a metropolitan area: neighbourhood, continuity, compactness, maximum distance and population. The development levels of the communes were determined with the use of synthetic measure. Its values were calculated considering the economic (e.g. the amount of income) and also social (e.g. unemployment) aspects of regional development, as well as features typical of metropolitan areas, such as: well-developed sectors of R&D, knowledge-based economy and serving superior services. In the research, linear arrangement methods classifying as taxonomic tools of multivariate data analysis was applied. The metropolitan area resulting from the research (BipOM) slightly differs from the Bydgoszcz-Toruń Metropolitan Area (B-TOM) which was formally appointed in 2005 and composed all of the communes located within the area of the Bydgoski and Toruński districts (NUTS 4). Chełmża and Koronowo, as the less developed communes of the districts, were excluded from the new metropolitan area, while the communes of Ciechocinek, Nakło and Unisław, belonging to the neighbouring districts of the region, were included in the BipOM due to their significant level of regional development and its dynamics. Furthermore the Inowrocław district (bordered on the BipOM) was identified as the prospective candidate for the BipOM, due to the fact that its communes demonstrate a high potential for regional development.

The Fragmentation of Metropolitan Public School Districts and the Segregation of American Schools: A Longitudinal Analysis

2014 ◽  
Vol 116 (12) ◽  
pp. 1-30 ◽  
Author(s):  
Meredith P. Richards ◽  
Kori J. Stroub
Keyword(s):  
Public School ◽  
School District ◽  
School Districts ◽  
Metropolitan Area ◽  
Rapid Growth ◽  
Metropolitan Areas ◽  
Public School Districts ◽  
Ethnic Segregation ◽  
Public School District ◽  
Racial Ethnic

Context Scholars have increasingly raised concerns about the “fragmentation” or proliferation of metropolitan public school districts, citing the potential for fragmentation to facilitate racial/ethnic segregation by permitting individuals to sort more efficiently across district boundaries. In addition, scholars have expressed particular concern about the rapid growth of charter districts and their potential to exacerbate segregation. Purpose of Study In this study, we provide initial evidence on the effect of public school district fragmentation on the trajectory of racial/ethnic segregation in metropolitan areas, attending to the differential effects of regular school district fragmentation as well as charter district fragmentation. Research Design Using NCES Common Core data for the 2002–2010 school years, we computed measures of regular public school district fragmentation and charter district fragmentation as well as nine measures of racial/ethnic segregation for all 366 U.S. metropolitan areas (3 geographic x 3 racial/ethnic decompositions). We then estimated a series of multilevel longitudinal models predicting change in each measure of segregation as a function of regular and charter school district fragmentation. Results We found that school district fragmentation is unrelated to the overall level of segregation in a metropolitan area. More fragmented metropolitan areas have higher levels of segregation across districts than less fragmented metropolitan areas; however, they have lower levels of segregation within districts and equivalent levels of total metropolitan segregation. Likewise, school district fragmentation was not associated with worsening segregation over time or with attenuation of the secular trend toward declining segregation. More fragmented metropolitan areas had smaller declines in between-district segregation over the study period than less fragmented metropolitan areas; however, they had equivalent declines in within-district and total metropolitan segregation. In addition, charter district fragmentation was unrelated to the level or trajectory of school segregation in a metropolitan area. Conclusions Our results provide a somewhat more sanguine assessment of school district fragmentation than previous research. We found that the fragmentation of regular public school districts serves to shift the geographic scale of segregation from within districts to between districts; however, fragmentation does not exacerbate metropolitan racial/ethnic segregation. In addition, despite the rapid growth of charter districts, we find no evidence that charter district fragmentation has worsened overall metropolitan racial/ethnic segregation. Moreover, metropolitan areas are not experiencing the “fragmentation” of their traditional public school districts; rather, traditional school districts are consolidating despite increasing enrollment.

School Leavers With Verified Disabilities

2020 ◽  
pp. 327-366
Author(s):  
Helena Stark
Keyword(s):  
Young Adults ◽  
Retrospective Study ◽  
Young Adult ◽  
21St Century ◽  
Metropolitan Area ◽  
Small Town ◽  
Metropolitan Areas ◽  
Youth Engagement ◽  
Transition Outcomes ◽  
Employment Rates

Globally, young adult employment rates have declined in the 21st century. In Australia, youth from non-metropolitan areas have a lower engagement rate in employment than their metropolitan peers, despite one rarely hearing declarations from school leavers that they aim to be unemployed and never work. This chapter investigates transition outcomes for young adults from a non-metropolitan area through a small retrospective study. The purpose is to identify influences that may impact youth engagement in employment or training for school leavers in a small town, and that may be dissimilar from influences affecting their metropolitan counterparts. Research also focuses on the influences affecting transition to employment for school leavers with verified disabilities in non-metropolitan areas and what barriers they experience to accessing employment or study.

scholarly journals Long-Range Transport Influence on Key Chemical Components of PM2.5 in the Seoul Metropolitan Area, South Korea, during the Years 2012–2016

Atmosphere ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 48 ◽  
Author(s):  
Changhan Bae ◽  
Byeong-Uk Kim ◽  
Hyun Cheol Kim ◽  
Chul Yoo ◽  
Soontae Kim
Keyword(s):  
Long Range ◽  
Metropolitan Area ◽  
Inorganic Ions ◽  
Long Range Transport ◽  
Chemical Components ◽  
Component Ratio ◽  
Seoul Metropolitan Area ◽  
Range Transport ◽  
The Impact ◽  
Pm2.5 Concentration

This study identified the key chemical components based on an analysis of the seasonal variations of ground level PM2.5 concentrations and its major chemical constituents (sulfate, nitrate, ammonium, organic carbon, and elemental carbon) in the Seoul Metropolitan Area (SMA), over a period of five years, ranging from 2012 to 2016. It was found that the mean PM2.5 concentration in the SMA was 33.7 μg/m3, while inorganic ions accounted for 53% of the total mass concentration. The component ratio of inorganic ions increased by up to 61%–63% as the daily mean PM2.5 concentration increased. In spring, nitrate was the dominant component of PM2.5, accounting for 17%–32% of the monthly mean PM2.5 concentrations. In order to quantify the impact of long-range transport on the SMA PM2.5, a set of sensitivity simulations with the community multiscale air-quality model was performed. Results show that the annual averaged impact of Chinese emissions on SMA PM2.5 concentrations ranged from 41% to 44% during the five years. Chinese emissions’ impact on SMA nitrate ranged from 50% (winter) to 67% (spring). This result exhibits that reductions in SO2 and NOX emissions are crucial to alleviate the PM2.5 concentration. It is expected that NOX emission reduction efforts in China will help decrease PM2.5 concentrations in the SMA.

scholarly journals Regenerative Food Systems to Restore Urban-Rural Relationships: Insights from the Concepción Metropolitan Area Foodshed (Chile)

2019 ◽  
Vol 11 (10) ◽  
pp. 2892 ◽  
Author(s):  
Ana Zazo-Moratalla ◽  
Isidora Troncoso-González ◽  
Andrés Moreira-Muñoz
Keyword(s):  
Metropolitan Area ◽  
Food Systems ◽  
Metropolitan Areas ◽  
Local Food Systems ◽  
Food Traceability ◽  
Methodological Tool ◽  
Urban Rural ◽  
Key Aspects ◽  
The City ◽  
Shed Light

Cities, in recent years, have seen their functional and metabolic relationships with their agrarian hinterland being either broken off completely or substantially damaged. Within this context, Local Food Systems (LFS) can play a key role in restoring the supply relationships under regenerative assumptions. This paper analyses LFS within the Concepción Metropolitan Area (CMA) as a representative case of Metropolitan Areas in Chile. The aim of the paper is to evaluate whether LFS are regenerating sustainable rural-urban relationships, and to accomplish this goal, foodsheds have been used as a methodological tool to both characterise and represent food traceability. For this purpose, three quantitative foodshed indicators have been applied and three qualitative spatial analytical categories of the Regenerative Food Systems (RFS) defined to decode the behaviour of LFS in the CMA. The proposed method has been successful as an initial exploratory attempt to characterize the regenerative potential of RFS. The results highlight that LFS in the CMA are certainly restoring relationships between the city and its surrounding farmland by establishing new and renewed supply linkages. Further, the application of this method has shed light on some key aspects that show how an LFS is being converted into a potential RFS.

scholarly journals Regional contributions to particulate matter concentration in the Seoul metropolitan area, South Korea: seasonal variation and sensitivity to meteorology and emissions inventory

2017 ◽  
Vol 17 (17) ◽  
pp. 10315-10332 ◽  
Author(s):  
Hyun Cheol Kim ◽  
Eunhye Kim ◽  
Changhan Bae ◽  
Jeong Hoon Cho ◽  
Byeong-Uk Kim ◽  
...  
Keyword(s):  
Particulate Matter ◽  
Seasonal Variation ◽  
Air Quality ◽  
South Korea ◽  
Metropolitan Area ◽  
Policy Support ◽  
Seoul Metropolitan Area ◽  
Regional Air Quality ◽  
Emissions Inventories ◽  
The Impact

Abstract. The impact of regional emissions (e.g., domestic and international) on surface particulate matter (PM) concentrations in the Seoul metropolitan area (SMA), South Korea, and its sensitivities to meteorology and emissions inventories are quantitatively estimated for 2014 using regional air quality modeling systems. Located on the downwind side of strong sources of anthropogenic emissions, South Korea bears the full impact of the regional transport of pollutants and their precursors. However, the impact of foreign emissions sources has not yet been fully documented. We utilized two regional air quality simulation systems: (1) a Weather Research and Forecasting and Community Multi-Scale Air Quality (CMAQ) system and (2) a United Kingdom Met Office Unified Model and CMAQ system. The following combinations of emissions inventories are used: the Intercontinental Chemical Transport Experiment-Phase B, the Inter-comparison Study for Asia 2010, and the National Institute of Environment Research Clean Air Policy Support System. Partial contributions of domestic and foreign emissions are estimated using a brute force approach, adjusting South Korean emissions to 50 %. Results show that foreign emissions contributed  ∼  60 % of SMA surface PM concentration in 2014. Estimated contributions display clear seasonal variation, with foreign emissions having a higher impact during the cold season (fall to spring), reaching  ∼  70 % in March, and making lower contributions in the summer,  ∼  45 % in September. We also found that simulated surface PM concentration is sensitive to meteorology, but estimated contributions are mostly consistent. Regional contributions are also found to be sensitive to the choice of emissions inventories.

Origin and distribution of the polyatomic molecules in the atmosphere

1956 ◽  
Vol 236 (1205) ◽  
pp. 187-193 ◽  
Keyword(s):  
Water Vapour ◽  
Ultra Violet ◽  
Ground Level ◽  
Absorption Bands ◽  
Ultra Violet Radiation ◽  
Low Concentrations ◽  
Vertical Distributions ◽  
Similar Accuracy ◽  
Lapse Rates ◽  
Made In

Of those gases which occur in the upper atmosphere and have strong absorption bands in the infra-red part of the spectrum and which must, therefore, be con­sidered when calculating the absorption and radiation of heat in the atmosphere, only carbon dioxide is uniformly mixed with the air at all heights which we are likely to be dealing with; it will not be considered further here. The vertical distributions of water vapour and ozone are of great interest, particularly when considered together. Water vapour, originating at ground level, usually decreases rather rapidly with increasing height, particularly in the lower stratosphere. This leads to extremely low concentrations at a height of about 15 km. On the other hand, ozone, being formed by the action of solar ultra-violet radiation at a height of 30 km or more, decreases in concentration downwards. We find, therefore, ozone diffusing downwards and water vapour diffusing upwards through the same region of the atmosphere, but, as we shall see, with very different lapse rates. Water vapour The standard hygrometers which are used to measure the humidity from free balloons are only satisfactory at temperatures above about 235°K, and our knowledge of the humidity at high levels in the atmosphere is almost entirely dependent on measurements made with frost-point hygrometers carried on air­craft. The work of the Meteorological Research Flight of the British Meteorological Office is notable for the very large number of measurements made from Mosquito aircraft to a height of about 12 km and more recently from Canberra aircraft to 15 km. Most unfortunately, hardly any measurements having similar accuracy have been made in other parts of the world. However, at the present time Dr A. W. Brewer is in north Norway making such measurements with the kind co-operation of the Norwegian Air Force and I had hoped that some results might have been available in time to report them at this Discussion (see note at end of paper).

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