scholarly journals ANALYSIS OF GLOBAL URBAN TEMPERATURE TRENDS AND URBANIZATION IMPACTS

2018 ◽  
Vol XLII-3 ◽  
pp. 757-763
Author(s):  
K. I. Lee ◽  
J. Ryu ◽  
S. W. Jeon
Keyword(s):  
Surface Temperature ◽  
Urban Area ◽  
Urban Areas ◽  
Linear Regression Analysis ◽  
Urban Climate ◽  
Mean Value ◽  
Future Research ◽  
Temperature Trends ◽  
Standard Values

Due to urbanization, urban areas are shrinking green spaces and increasing concrete, asphalt pavement. So urban climates are different from non-urban areas. In addition, long-term macroscopic studies of urban climate change are becoming more important as global urbanization affects global warming. To do this, it is necessary to analyze the effect of urbanization on the temporal change in urban temperature with the same temperature data and standards for urban areas around the world.<br> In this study, time series analysis was performed with the maximum, minimum, mean and standard values of surface temperature during the from 1980 to 2010 and analyzed the effect of urbanization through linear regression analysis with variables (population, night light, NDVI, urban area).<br> As a result, the minimum value of the surface temperature of the urban area reflects an increase by a rate of 0.28K&amp;thinsp;decade<sup>-1</sup> over the past 31 years, the maximum value reflects an increase by a rate of 0.372K&amp;thinsp;decade<sup>-1</sup>, the mean value reflects an increase by a rate of 0.208 decade<sup>-1</sup>, and the standard deviation reflects a decrease by rate of 0.023K&amp;thinsp;decade<sup>-1</sup>. And the change of surface temperature in urban areas is affected by urbanization related to land cover such as decrease of greenery and increase of pavement area, but socioeconomic variables are less influential than NDVI in this study.<br> This study are expected to provide an approach to future research and policy-planning for urban temperature change and urbanization impacts.

scholarly journals Analysis of Long-Term Temperature Trend as an Urban Climate Change Indicator

2017 ◽  
Vol 31 (2) ◽  
pp. 196-208
Author(s):  
Dadang Subarna
Keyword(s):  
Climate Change ◽  
Surface Temperature ◽  
Linear Trend ◽  
Urban Climate ◽  
Mean Value ◽  
Test Method ◽  
Trend Test ◽  
Climatic Impact ◽  
The Mean

Temperature plays a major role in detecting climate change brought about by urbanisation and industrialisation. Most climatic impact studies rely on changes in the average values of meteorological variables such as temperature. This paper attempts to study the temporal changes in the mean value of the air surface temperature over Jakarta city during the last century, specifically in the period 1901–2002.The data used in this study were taken from the Jakarta Climatology Station because they are of are good quality, there are extensive records and there is little missing or blank data. Statistic descriptive methods were employed, including a description of the type of probabilistic model chosen to represent the monthly mean air surface temperature time series. The long-term change in temperature was evaluated using the Mann-Kendall trend test method and the statistical linear trend test; the results of these two tests agreed. During the last 100 years, data observations from the station indicate that the monthly mean value of the air surface temperature of Jakarta city has increased at a rate of about 0.152°C decade–1 and has not exhibited variability signals but has changed on average. Based on the linear regression model, the mean value of the air surface temperature over Jakarta city is estimated to reach around 28.5°C in 2050 and 29.23°C in 2100.

scholarly journals Water Woes in Zimbabwe’s Urban Areas in the Middist Of Plenty: 2000 -Present

2012 ◽  
Vol 1 (2) ◽  
pp. 151 ◽  
Author(s):  
Enock C. Makwara
Keyword(s):  
Waste Management ◽  
Water Supply ◽  
Urban Area ◽  
Urban Areas ◽  
Service Failure ◽  
Urban Residents ◽  
Contaminated Water ◽  
Recent Outbreak

Zimbabwe’s urban areas are choking under the weight of over-crowdedness amidstdilapidated infrastructure that is characterised by constant service failure. The water andsewer systems of the country’s major urban centres are on the verge of collapse, thusputting millions of people in danger of consuming contaminated water, including thatfrom underground sources. Waste management and water supply problems manifestthemselves as challenges bedevilling many an urban area in the country. The quality andquantity of water supplied in Zimbabwe’s urban centres has plummeted in recent yearsand has assumed crisis proportions owing to the difficult economic situation and otherchallenges faced by the country. The situation is desperate and dire, as is evidenced by thepoor quality of delivered water, severe water rationing and the outbreak of water-bornediseases in the urban areas dotted across the country. The situation demands and dictatesthat solutions be proffered as a matter of urgency.The recent outbreak of epidemics hasbeen blamed on lack of access to safe water and poor sanitation, two crucial factors incontrolling the spread of diseases. An overly bureaucratic environment, where decisionsand processes take longer, makes life complicated for poor urban residents. Such ascenario motivated the researchers to examine the problem with a view to suggest waysand means of intervening to mitigate and resolve the problem. It emerged from thefindings that the problem is multifaceted in nature, hence a whole range of measures needto be adopted if a long-term solution is to be provided.

Cordaid’s Post-Disaster Shelter Strategy in Haiti: Linking Relief and Development

2014 ◽  
Vol 39 (3) ◽  
pp. 77-85
Author(s):  
Harmen Janse ◽  
Kees van der Flier
Keyword(s):  
Urban Area ◽  
Urban Areas ◽  
Life Support ◽  
Comparative Case Study ◽  
Urban Context ◽  
Short Term ◽  
Stage Of Development ◽  
Post Disaster

Haiti was struck by a heavy earthquake in 2010 and international aid poured into the country. News reports in 2011 were not very positive about the results of post-disaster reconstruction: “The relief efforts are only putting Haiti on life-support instead of evolving into the next stage of development”. One of the non-governmental organisations (NGOs) involved in Haiti was Cordaid, implementing a ‘transitional shelter strategy’ to support the transformation of neigh-bourhoods from a state of life-support into a state of self-sustaining development. The strategy was implemented in both a rural and an urban area. The main feature of the strategy was the provision of structures that could be adapted from simple shelters to permanent houses. Since the results of the strategy were mixed and ambiguous, a comparative case study was conducted to evaluate the shelter strategy in both areas. The objective was to draw lessons about what has to be taken into account when formulating future urban shelter strategies. The case study is discussed in this article. The main finding from the case study is that producing the intended number of shelters within the financial and time budgets that were set (efficiency), was more difficult in the urban area than in the rural area. But the conditions for linking relief and development (effectiveness) are more favourable in the urban context. NGOs may achieve long-term (effective) results in the urban context when a lower efficiency can be justified. That is why NGOs need to engage in a debate about the extent to which they are able to focus on long-term shelter or housing strategies. The important element in the debate is communication with the donors who are often focused on short-term relief measures. However urban areas cannot be rebuilt with only short-term interventions. The link between relief and development has to be made by a process-orientated approach focusing on capacities of local participants.

Reconciling the Spatial Distribution of the Surface Temperature Trends in the Southeastern United States

2012 ◽  
Vol 25 (10) ◽  
pp. 3610-3618 ◽  
Author(s):  
V. Misra ◽  
J.-P. Michael ◽  
R. Boyles ◽  
E. P. Chassignet ◽  
M. Griffin ◽  
...  
Keyword(s):  
United States ◽  
South Carolina ◽  
Surface Temperature ◽  
Spatial Heterogeneity ◽  
Rural Areas ◽  
Urban Areas ◽  
Summer Season ◽  
Boreal Summer ◽  
Temperature Trends ◽  
Linear Trends

Abstract This study attempts to explain the considerable spatial heterogeneity in the observed linear trends of monthly mean maximum and minimum temperatures (Tmax and Tmin) from station observations in the southeastern (SE) United States (specifically Florida, Alabama, Georgia, South Carolina, and North Carolina). In a majority of these station sites, the warming trends in Tmin are stronger in urban areas relative to rural areas. The linear trends of Tmin in urban areas of the SE United States are approximately 7°F century−1 compared to about 5.5°F century−1 in rural areas. The trends in Tmax show weaker warming (or stronger cooling) trends with irrigation, while trends in Tmin show stronger warming trends. This functionality of the temperature trends with land features also shows seasonality, with the boreal summer season showing the most consistent relationship in the trends of both Tmax and Tmin. This study reveals that linear trends in Tmax in the boreal summer season show a cooling trend of about 0.5°F century−1 with irrigation, while the same observing stations on an average display warming trends in Tmin of about 3.5°F century−1. The seasonality and the physical consistency of these relationships with existing theories may suggest that urbanization and irrigation have a nonnegligible influence on the spatial heterogeneity of the surface temperature trends over the SE United States. The study also delineates the caveats and limitations of the conclusions reached herein due to the potential influence of perceived nonclimatic discontinuities (which incidentally could also have a seasonal cycle) that have not been taken into account.

scholarly journals NGHIÊN CỨU XU THẾ BIẾN ĐỘNG TRƯỜNG NHIỆT ĐỘ BỀ MẶT BIỂN VÀ ẢNH HƯỞNG CỦA ENSO ĐẾN VÙNG BIỂN TÂY NAM VIỆT NAM SỬ DỤNG DỮ LIỆU VIỄN THÁM VÀ GIS

2020 ◽  
Vol 20 (2) ◽  
pp. 129-141
Author(s):  
Tran Anh Tuan ◽  
Vu Hai Dang ◽  
Pham Viet Hong ◽  
Do Ngoc Thuc ◽  
Nguyen Thuy Linh ◽  
...  
Keyword(s):  
Surface Temperature ◽  
Sea Surface Temperature ◽  
Monsoon Season ◽  
Linear Regression Analysis ◽  
Southwest Monsoon ◽  
Sea Surface ◽  
Northeast Monsoon ◽  
Temperature Trends ◽  
Sea Surface Temperature Anomalies ◽  
Southwest Monsoon Season

In this article, the sea surface temperature trends and the influence of ENSO on the southwest sea of Vietnam were analyzed using the continuous satellite-acquired data sequence of SST in the period of 2002–2018. GIS and average statistical methods were applied to calculate the average monthly and seasonal sea surface temperature, the seasonal sea surface temperature anomalies for each year and for the whole study period. Subsequently, the changing trends of sea surface temperature in the northeast and southwest monsoon seasons were estimated using linear regression analysis. Research results indicated that the sea surface temperature changed significantly throughout the calendar year, in which the maximum and minimum sea surface temperature are 31oC in May and 26oC in January respectively. Sea surface temperature trends range from 0oC/year to 0.05oC/year during the Northeast monsoon season and from 0.025oC/year to 0.055oC/year during the southwest monsoon season. Results based on the Oceanic Niño Index (ONI) analysis also show that the sea surface temperature in the study area and adjacent areas is strongly influenced and significantly fluctuates during El Niño and La Niña episodes.

scholarly journals Proposta Metodológica Aplicada ao Estudo de Clima Urbano

2019 ◽  
Vol 12 (6) ◽  
pp. 2023
Author(s):  
Cássia De Castro Martins Ferreira ◽  
Franciele De Oliveira Pimentel ◽  
Yan Carlos Gomes Vianna
Keyword(s):  
Urban Area ◽  
Vegetation Cover ◽  
Urban Areas ◽  
Spatial Information ◽  
Urban Climate ◽  
Analytical Methodology ◽  
Thermal Fields ◽  
Dynamic Potential ◽  
Definition Of ◽  
Climate Study

Este artigo mostra uma metodologia analítica aplicada ao estudo de clima urbano, inspirada no Urban Climate Map (UC-Map). Foram utilizados uma série de camadas de informação espacial, medições climáticas e conhecimento do clima urbano para avaliar e mapear o potencial térmico e dinâmico em área urbana, visando identificar diferentes campos térmicos. As informações foram agrupadas em quatro eixos principais, a saber densidade construtiva, albedo, cobertura vegetal e altimetria. A proposta metodológica foi aplicada para a cidade de Juiz de Fora-MG, uma área urbana de médio porte, localizada em uma região de mares de morros, na qual fatores como declividade e altitude são importantes no potencial térmico e dinâmico. O resultado da aplicação desta metodologia converge com os dados experimentais e evidencia os efeitos do uso do solo, dos materiais construtivos e do fluxo de pessoas e mercadorias na definição de diferentes campos térmicos. Evidencia que a distribuição e o tamanho da cobertura vegetal, além da amplitude da ventilação, interferem e proporcionam ambientes mais frescos e, portanto, reduzem o armazenamento de calor. A metodologia apresentada é simples de aplicar e pode ser adaptada para outras áreas urbanas com características semelhantes às de Juiz de Fora-MG.  Methodological Propose Applied to The Urban Climate Study A B S T R A C TThis article shows an analytical methodology applied to the urban climate study, inspired by the Urban Climate Map (UC-Map). A series of layers of spatial information, climate measurements and knowledge of the urban climate were used to evaluate and map the thermal and dynamic potential in an urban area, in order to identify different thermal fields. The information was grouped into four main axes, namely constructive density, albedo, vegetation cover and altimetry. The methodological proposal was applied to the city of Juiz de Fora-MG, a medium-sized urban area, located in a region of sea of hills, in which factors such as slope and altitude are important in the thermal and dynamic potential. The result of the application of this methodology converges with the experimental data and evidences the effects of the use of the soil, constructive materials and the flow of people and merchandise in the definition of different thermal fields. It shows that the distribution and size of the vegetation cover, besides the amplitude of the ventilation interfere and provide fresher environments and therefore reduce the storage of heat. The methodology presented is simple to apply and can be adapted to other urban areas with characteristics similar to those of Juiz de Fora-MG.Keywords: Thermal fields, urban climate, spatial model, urban climate map, dynamic potential.

scholarly journals Comparative Study of Factors Contributing to Land Surface Temperature in High-Density Built Environments in Megacities Using Satellite Imagery

2021 ◽  
Vol 13 (24) ◽  
pp. 13706
Author(s):  
Frankie Fanjie Zeng ◽  
Jiajun Feng ◽  
Yuanzhi Zhang ◽  
Jin Yeu Tsou ◽  
Tengfei Xue ◽  
...  
Keyword(s):  
Land Use ◽  
Hong Kong ◽  
Surface Temperature ◽  
Land Surface ◽  
Urban Areas ◽  
Linear Regression Analysis ◽  
Large Area ◽  
Combination Strategy ◽  
International Airport ◽  
Artificial Heat

In this study, the root sources contributing to the urban heat island (UHI) effect between megacities, such as Hong Kong and Shenzhen, were integrated and compared using satellite remote sensing data. Classification and multilayer perceptron regression tree (CARTMLP) algorithms were used to classify land use. The radiative transfer equation method was applied to retrieve the land surface temperatures (LSTs) in the study area. Multiple linear regression analysis was applied to determine the relationship between land-use types and UHIs. The experimental results show a large area of relatively high temperature dispersed within Shenzhen, and comparatively small areas highly centralized in Hong Kong, with the retrieved LST in Hong Kong lower than that in Shenzhen. In addition, the surface temperature of large complex buildings decorated with high-albedo materials in Hong Kong was higher than in Shenzhen (e.g., Hong Kong International Airport, 25.12 °C; Shenzhen Bao’an International Airport, 23.38 °C), with artificial heat being an important contributor to these differences. These results also imply that high-albedo materials are sufficient to alleviate high temperatures. These findings are integrated to propose an organic combination strategy for reducing UHI effects in urban areas in megacities worldwide, such as Hong Kong and Shenzhen in China.

scholarly journals Differences in subjective age by filial caregiving status among US adults in mid and later life

2021 ◽  
Vol 5 (Supplement_1) ◽  
pp. 808-808
Author(s):  
Hyojin Choi ◽  
Kristin Litzelman
Keyword(s):  
Linear Regression Analysis ◽  
Adult Child ◽  
Later Life ◽  
Well Being ◽  
Chronological Age ◽  
Future Research ◽  
Subjective Age ◽  
Important Indicator ◽  
Subjective Aging

Abstract Subjective age is an important indicator of age identity and is associated with both psychological and physical well-being. Previous studies have revealed that older adults who feel younger than their chronological age show better health status, better life satisfaction, and less risk of mortality. Considerable evidence shows that stress contributes to feeling older than one’s chronological age. Given the fact that taking a caregiving role involves stress, it is expected that caregiving might accelerate subjective aging. This study examined the association between the stressor of caregiving and subjective age in mid and later life. Data were drawn from the Health and Retirement Study in 2014 and 2016. Participants aged 50 years and over (n=1,087) were identified according to adult-child caregiver status at across the two waves: those who provided care consecutively (long-term caregivers), those who became caregivers in 2016 (new caregivers), those who were no longer providing care in 2016 (recent caregivers), or those who did not report providing care in both 2014 and 2016 (non-caregivers). Linear regression analysis showed that new caregivers reported feeling older than their chronological age compared to non-caregivers. However, long-term or recent caregivers did not show significant differences in subjective age compared to non-caregivers. The finding is consistent with the stress process theory and adaptation hypothesis. Although the onset of caregiving stress may accelerate subjective aging, this deleterious effect may decrease over time due to family caregivers’ adaptability. Future research will examine the role of support, resilience and mastery in this pathway.

The Urban Network and Economic Reform in Vietnam

1995 ◽  
Vol 27 (5) ◽  
pp. 793-808 ◽  
Author(s):  
D Forbes
Keyword(s):  
Urban Area ◽  
Economic Reform ◽  
Urban Areas ◽  
Economic Reforms ◽  
Ho Chi Minh City ◽  
Urban Network ◽  
Capitalist Economy ◽  
Opening Up

Since the mid-1970s, Vietnam experienced a period of transition to socialism, before bringing in economic reforms which led to the gradual dismantling of the subsidised system of planning and the opening up of the country to the global capitalist economy. Economic reform and renovation has important implications for the urban areas of Vietnam. The emergence of markets and the abandonment of many restrictions on travel resulted in a freeing up of the urbanisation process during the 1980s and early 1990s. These processes are considered, and the implications for Vietnam's largest urban area, Ho Chi Minh City, are examined. The likely impact of Vietnam's long-term socioeconomic strategy on the urban network in the remainder of the decade is considered.

scholarly journals Measuring and Predicting Long-Term Land Cover Changes in the Functional Urban Area of Budapest

2020 ◽  
Vol 12 (8) ◽  
pp. 3331
Author(s):  
József Lennert ◽  
Jenő Zsolt Farkas ◽  
András Donát Kovács ◽  
András Molnár ◽  
Rita Módos ◽  
...  
Keyword(s):  
Land Cover ◽  
Urban Area ◽  
Urban Sprawl ◽  
Urban Areas ◽  
Agricultural Land ◽  
Arable Land ◽  
Land Cover Changes ◽  
Research Findings ◽  
Nature And Society

The loss of farmland to urban use in peri-urban areas is a global phenomenon. Urban sprawl generates a decline in the availability of productive agricultural land around cities, causing versatile conflicts between nature and society and threatening the sustainability of urban agglomerations. This study aimed to uncover the spatial pattern of long-term (80 years) land cover changes in the functional urban area of Budapest, with special attention to the conversion of agricultural land. The paper is based on a unique methodology utilizing various data sources such as military-surveyed topographic maps from the 1950s, the CLC 90 from 1990, and the Urban Atlas from 2012. In addition, the multilayer perceptron (MLP) method was used to model land cover changes through 2040. The research findings showed that land conversion and the shrinkage of productive agricultural land around Budapest significantly intensified after the collapse of communism. The conversion of arable land to artificial surfaces increased, and by now, the traditional metropolitan food supply area around Budapest has nearly disappeared. The extent of forests and grasslands increased in the postsocialist period due to national afforestation programs and the demand of new suburbanites for recreational space. Urban sprawl and the conversion of agricultural land should be an essential issue during the upcoming E.U. Common Agricultural Policy (CAP) reforms.

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