scholarly journals A new approach for highly resolved air temperature measurements in urban areas

2011 ◽  
Vol 4 (1) ◽  
pp. 1001-1019 ◽  
Author(s):  
M. Buttstädt ◽  
T. Sachsen ◽  
G. Ketzler ◽  
H. Merbitz ◽  
C. Schneider
Keyword(s):  
Air Temperature ◽  
Urban Areas ◽  
Thermal Conditions ◽  
Research Programme ◽  
Temperature Data ◽  
Urban Structure ◽  
New Approach ◽  
Local Climate ◽  
Climate Conditions ◽  
The City

Abstract. In different fields of applied local climate investigation, highly resolved data of air temperature are of great importance. As a part of the research programme entitled City2020+, which deals with future climate conditions in agglomerations, this study focuses on increasing the quantity of urban air temperature data intended for the analysis of their spatial distribution. A new measurement approach using local transport buses as "riding thermometers" is presented. By this means, temperature data with a very high temporal and spatial resolution could be collected during scheduled bus rides. The data obtained provide the basis for the identification of thermally affected areas and for the investigation of factors in urban structure which influence the thermal conditions. Initial results from the ongoing study, which show the temperature distribution along different traverses through the city of Aachen, are presented.

scholarly journals Aumento das temperaturas extremas na cidade do Rio de Janeiro e o desvio ocasionado durante um evento de El Niño intenso (Thermal change in the city of Rio de Janeiro and the deviation caused during an intense El Niño event)

2019 ◽  
Vol 12 (4) ◽  
pp. 1291
Author(s):  
Henderson Silva Wanderley ◽  
Ronabson Cardoso Fernandes ◽  
André Luiz De Carvalho
Keyword(s):  
Air Temperature ◽  
El Niño ◽  
Urban Areas ◽  
Rio De Janeiro ◽  
El Nino ◽  
Pearson Correlation ◽  
Temperature Data ◽  
Kolmogorov Smirnov ◽  
The City ◽  
Maximum Air Temperature

O processo de urbanização tem o potencial de alterar a característica térmica e aerodinâmica da superfície dos grandes centros urbanos, possibilitando o aumento da temperatura do ar. No entanto, a correlação da intensificação da temperatura do ar em áreas urbanas em resposta a um evento extremo de El Niño é escassa, principalmente no que se refere à cidade do Rio de Janeiro. Assim, o objetivo deste estudo visa quantificar as mudanças ocorridas na temperatura do ar (máxima e mínima) na cidade do Rio de Janeiro e o desvio ocasionado às temperaturas extremas durante um evento de El Niño intenso. Os dados de temperatura do ar utilizados referem-se às normais climatológicas nos períodos climatológicos de 1961-1990 e 1980-2010, comparados entre si, e posteriormente, comparou-se as normais climatológicas do período de 1980-2010 com as do El Niño intenso de 2015-2016. Para a análise, dados de temperatura mínima e máxima do ar em uma escala mensal foram comparados. As médias mensais das temperaturas em análise foram submetidas ao ajuste do coeficiente de correlação de Pearson, ao teste t de Student e ao teste de Kolmogorov-Smirnov. Os resultados mostraram um aumento médio na temperatura do ar mínima (máxima) de +0,66 °C e +0,73 °C (+1,21 °C e +0,90 °C), respectivamente entre os períodos climatológicos e o último período climatológico com o evento El Niño intenso, entretanto, sem diferença estatística para o aumento da média e de sua distribuição.   A B S T R A C TUrbanization process has potential to change the thermal and aerodynamic characteristics of large urban centers surface, allowing the increase of air temperature. However, correlation of air temperature intensification in urban areas in response to an extreme event of El Niño is scarce, especially in relation to the city of Rio de Janeiro. Thus, the objective of this study is to quantify the changes occurred in the air temperature (maximum and minimum) in the city of Rio de Janeiro and the deviation caused to extreme temperatures during an intense event of El Niño. Data of air temperature data refer to the climatological normals in the periods of 1961-1990 and 1980-2010, and intense event of El Niño occurred in 2015-2016. For the analysis, minimum and maximum air temperature data on a monthly scale were compared. Monthly mean values of the air temperature under analysis were adjusted to the Pearson correlation coefficient, Student's t-test and Kolmogorov-Smirnov test. The results showed a mean increase in minimum (maximum) air temperature of +0.66 °C and +0.73 °C (+1.21 °C and +0.90 °C), respectively between the climatological periods and the last climatological period with the intense event of El Niño, however, with no statistical difference for the increase of the mean and its distribution.Keywords: Urban climate, ENSO, air temperature.

scholarly journals EVALUATION OF THE SEASONAL NIGHTTIME LST-AIR TEMPERATURE DISCREPANCIES AND THEIR RELATION TO LOCAL CLIMATE ZONES (LCZ) IN STRASBOURG

2021 ◽  
Vol XLIII-B3-2021 ◽  
pp. 391-398
Author(s):  
S. Del Pozo ◽  
T. Landes ◽  
F. Nerry ◽  
P. Kastendeuch ◽  
G. Najjar ◽  
...  
Keyword(s):  
Spatial Resolution ◽  
Air Temperature ◽  
Land Surface ◽  
Urban Areas ◽  
Research Work ◽  
Local Climate ◽  
Urban Climatology ◽  
Urban Energy Balance ◽  
Local Climate Zones ◽  
The City

Abstract. More and more uses and applications are being given to local climate zone (LCZ) maps, which describe the structure of the urban and semi-urban areas. Among others, it is worth highlighting its use in studies of urban heat islands (UHI), sustainability and urban energy balance. Even if the classes are well described in the literature, it is difficult to estimate the general precision of these classification maps because the classification is highly dependent of the urban typology of the city under study. However, LCZ maps represent a reference in the field of urban climatology. This research work aims to make use of these maps to explain the strong influence of LCZ classes on land surface temperature (LST) and, consequently, on air temperature (AT). This kind of investigations will help us to explain the outliers observed in previous work between LST and AT at specific locations in the city of Strasbourg for the period 2012–2019. The LST data were obtained from the thermal infrared data of both ASTER (with 90-m spatial resolution and 16-days temporal resolution) and MODIS satellite (with 1-km spatial resolution and daily revisit period). The reference ATs were obtained from different field measurement provided by a huge network of meteorological stations distributed in the city of Strasbourg. The comparison of measured ATs and remote LSTs provide the opportunity to thoroughly evaluate the relationship between these two parameters both during the day and night, for different land covers and for different times of the year. Finally, UHI maps of Strasbourg for every season are presented.

scholarly journals Urban Cold and Heat Island in the City of Bragança (Portugal)

Climate ◽  
2018 ◽  
Vol 6 (3) ◽  
pp. 70 ◽  
Author(s):  
Artur Gonçalves ◽  
Gabriella Ornellas ◽  
António Castro Ribeiro ◽  
Filipe Maia ◽  
Alfredo Rocha ◽  
...  
Keyword(s):  
Rural Areas ◽  
Urban Areas ◽  
Thermal Environment ◽  
Urban Climate ◽  
Heat Island ◽  
Local Climate ◽  
Climate Conditions ◽  
Urban Green Spaces ◽  
Local Climate Zones ◽  
The City

The thermal environment is an important aspect of the urban environment because it affects the quality of life of urban residents and the energy use in buildings. Urban Heat Island (UHI) and Urban Cold Island (UCI) are complementary effects that are the consequence of cities’ structures interference with the local climate. This article presents results from five years of urban climate monitoring (2012–2016) in a small Portuguese city (Bragança) using a dense meteorological network of 23 locations covering a wide array of Local Climate Zones (LCZ), from urban areas to nearby rural areas. Results show the presence of both the UHI effect, from mid-afternoon until sunrise, and the UCI after sunrise, both being more intense under the dense midrise urban context and during the summer. Urban Green Spaces had an impact on both UHI and UCI, with an important role in cooling areas of the city during daytime in the summer. Other LCZs had less impact on local thermal conditions. Despite the small size of this city, both effects (UHI and UCI) had a relevant intensity with an impact on local climate conditions. Both effects tend to decrease in intensity with increasing wind speed and precipitation.

scholarly journals EMMISION OF POLLUTANTS ORIGINATING FROM MOBILE SOURCES ON THE EXAMPLE OF THE CITY OF KRAGUJEVAC

2019 ◽  
pp. 115
Author(s):  
Zoran Marjanović ◽  
Miomir Raos ◽  
Milena Jovanovic ◽  
Jovana Randjelović
Keyword(s):  
Air Pollution ◽  
Urban Areas ◽  
Motor Vehicles ◽  
Traffic Density ◽  
Human Environment ◽  
Local Climate ◽  
Climate Conditions ◽  
Exhaust Gases ◽  
Mobile Sources ◽  
The City

Traffic jam makes cities less pleasant for living and it also decreases traffic efficiency whereas travel time, fuel consumption and drivers’ stress are increased. A special problem is its influence on people’s health caused by emission of exhaust gases. Emission of pollutants originating from mobile sources is primarily conditioned by a level of technologies applied to the vehicle, vehicle’s technical state, traffic intensity, traffic density, local climate conditions, etc. Air pollution due to use of motor vehicles is becoming one of the major problems in urban areas across the world. With the increase of the number of motor vehicles and traffic intensification, the influence of exhaust gases on human environment also has increased. Considering the average age of the vehicles participating in traffic in the city of Kragujevac and the traffic capacity of traffic arteries, most frequently not designed for such a large number of vehicles concentrated at the core of the city, it is to be expected that the air pollution coming from mobile sources will become a problem that requires detailed analysis. For that purpose, a detailed statistical analysis of the vehicle fleet of the city of Kragujevac is conducted. An estimation of the influence of the vehicles on the air pollution in the city of Kragujevac, has been given in the paper.

scholarly journals Thermal Comfort Simulation on Cik Ditiro Corridor

2019 ◽  
Vol 46 (1) ◽  
pp. 67-78
Author(s):  
Septian Eka Prayoga ◽  
Arif Kusumawanto
Keyword(s):  
Land Use ◽  
Thermal Comfort ◽  
Urban Areas ◽  
Rapid Development ◽  
Thermal Conditions ◽  
Simulation Method ◽  
Surface Material ◽  
Climate Variable ◽  
The City ◽  
Research Show

Surface materials that turn into hard surface material and lack of vegetations are some of the effects of rapid development that can affect the micro climate in urban areas. This happened on Cik Ditiro corridor in the city of Yogyakarta which had quite dense activities, this was marked by various functions of land use and human activities throughout the day. The method is simulation method that uses the EnviMET 4.0 software and the empirical measurements. This method is to simulate the value of each climate variable in existing conditions and ideal conditions. The results of this research show that the condition of the Cik Ditiro corridor still belongs to the heat which is uncomfortable thermal conditions. Recommendations result of this research is to make better thermal comfort on corridor. The result of this research to give recommendations in terms of improving better for thermal comfort.

scholarly journals Periurbanization and conservation pressures over remnants of native vegetation: impact on ecosystem services for a Latin-American capital city

2019 ◽  
Vol 4 (1) ◽  
pp. 21-32 ◽  
Author(s):  
Francisco de la Barrera ◽  
Cristián Henríquez ◽  
Fanny Coulombié ◽  
Cynnamon Dobbs ◽  
Alejando Salazar
Keyword(s):  
Ecosystem Services ◽  
Latin American ◽  
Urban Areas ◽  
Urban Expansion ◽  
Capital City ◽  
Local Climate ◽  
Urban Green Spaces ◽  
Vegetation Impact ◽  
Development Alternatives ◽  
The City

Abstract Urban expansion in Latin-American cities is faster than urban planning. In order to implement sustainable planning the capacity of peri-urban areas to provide ecosystem services must be evaluated in the context of competing urbanization and conservation pressures. In this study we analyzed the effect of urban expansion on peri-urban vegetation of the Metropolitan Area of Santiago and what ecosystem services are provided by El Panul, land rich in biodiversity embedded in the fringe of the city. The city has lost vegetation while urbanized areas grow. Under this context, we evaluated the multi-functionality of El Panul through the quantification of three ecosystem services (ES): sense of place through the interviews of 60 residents, recreation via GIS analyses, and local climate regulation determined with air temperature measurements. El Panul increased the provision of urban green spaces, where inhabitants recognize and appreciate ES, and it plays a significant role in mitigating the urban heat island on summer nights. ES have emerged as a concept and framework for evaluating competing urban development alternatives.

Correlation of air temperature and land surface temperature of Landsat-8 in cities of South Korea

2020 ◽  
Author(s):  
Sungwon Choi ◽  
Donghyun Jin ◽  
Noh-hun Seong ◽  
Daeseong Jung ◽  
Kyung-soo Han
Keyword(s):  
Correlation Analysis ◽  
Surface Temperature ◽  
Air Temperature ◽  
Land Surface ◽  
Urban Areas ◽  
Temperature Data ◽  
Landsat 8 ◽  
In Situ Data ◽  
Urban Greenery ◽  
Important Position

<p>Recently, there are many problems in urban area such as urban thermal island phenomenon, changes in urban green area, changes in urban weather and various urban types. And surface temperature data have been utilized in many areas to identify these phenomena. This means that surface temperatures is an important position in urban greenery and weather. High temporal and spatial resolution satellite data are needed to continuously observe the phenomenon in urban areas. In addition, the surface temperature varies from type of indicator, topography, and various factors, so there is a limit to the in-situ data for observing changes throughout the city. Therefore, various organizations around the world are currently conducting surface temperature measurements using satellites. However, the use of data in clear pixel is essential for accurate surface temperature calculations using satellites, but the accuracy of results will be reduced if the data from in the pixel which conclude clouds.</p><p>Therefore, we tried to solve these problems by analyzing the correlation between the air temperature data and the Landsat-8 LST data. The variables used in the correlation analysis are air temperature, Landsat-8 LST, NDVI and NDWI, and the study period is 2014 to 2016 and the study area is South Korea's five cities (Seoul, Busan, Daejeon, Daegu, Gwangju). For correlation analysis, the air temperature data points provided by the Korea Meteorological Administration and the Landsat-8 pixels were matched, and the correlation coefficient calculated by the correlation analysis was applied to the Landsat-8 satellite to calculate the LST. We validated by direct comparison the re-produced Landsat-8 LST with observed Landsat-8 LST. And the result of validation showed a high correlation of 0.9. It shows that compensation for the satellite's shortcomings from clouds by using the correlation between temperature and LST.</p>

scholarly journals Urban Emissions of CO2 from Davos, Switzerland: The First Real-Time Monitoring System Using an Atmospheric Inversion Technique

2013 ◽  
Vol 52 (12) ◽  
pp. 2654-2668 ◽  
Author(s):  
Thomas Lauvaux ◽  
Natasha L. Miles ◽  
Scott J. Richardson ◽  
Aijun Deng ◽  
David R. Stauffer ◽  
...  
Keyword(s):  
Real Time ◽  
Urban Areas ◽  
Atmospheric Model ◽  
Cold Wave ◽  
Local Climate ◽  
Diurnal Cycles ◽  
Mixing Ratios ◽  
Highly Correlated ◽  
The City ◽  
Atmospheric Inversion

AbstractAnthropogenic emissions from urban areas represent 70% of the fossil fuel carbon emitted globally according to carbon emission inventories. The authors present here the first operational system able to monitor in near–real time daily emission estimates, using a mesoscale atmospheric inversion framework over the city of Davos, Switzerland, before, during, and after the World Economic Forum 2012 Meeting (WEF-2012). Two instruments that continuously measured atmospheric mixing ratios of greenhouse gases (GHGs) were deployed at two locations from 23 December 2011 to 3 March 2012: one site was located in the urban area and the other was out of the valley in the surrounding mountains. Carbon dioxide, methane, and carbon monoxide were measured continuously at both sites. The Weather Research and Forecasting mesoscale atmospheric model (WRF), in four-dimensional data assimilation mode, was used to simulate the transport of GHGs over the valley of Davos at 1.3-km resolution. Wintertime emissions prior to the WEF-2012 were about 40% higher than the initial annual inventory estimate, corresponding to the use of heating fuel in the winter. Daily inverse fluxes were highly correlated with the local climate, especially during the severe cold wave that affected most of Europe in early February 2012. During the WEF-2012, emissions dropped by 35% relative to the first month of the deployment, despite similar temperatures and the presence of several thousand participants at the meeting. On the basis of composite diurnal cycles of hourly CO/CO2 ratios, the absence of traffic peaks during the WEF-2012 meeting indicated that change in road emissions is potentially responsible for the observed decrease in the city emissions during the meeting.

A Simulation Study on Energy Consumption of Cluster Distribution of Residential Buildings in Cold Zones

2011 ◽  
Vol 243-249 ◽  
pp. 5822-5827
Author(s):  
Jing Yuan Zhao ◽  
Qi Bo Liu
Keyword(s):  
Energy Consumption ◽  
Simulation Study ◽  
Residential Buildings ◽  
Thermal Conditions ◽  
Minimal Energy ◽  
Local Climate ◽  
Climate Conditions ◽  
Cluster Distribution ◽  
Different Seasons ◽  
Energy Consumption Simulation

The distribution of residential buildings is closely related to local climate conditions. This paper takes Xi’an region as its representative city to study the thermal conditions of various shapes of cluster distribution by utilizing energy consumption simulation. By sequentially changing the dimensions of each unit building in the cluster, it sets up models of mathematical examples which meet the requirements of different seasons. Based on the annual minimal energy consumption of buildings, the paper quantitatively expounds the influence of cluster distribution on buildings’ energy consumption. This study finally works out a recommendation for the cluster distribution in Xi’an region, i.e. the annual comprehensive energy consumption of buildings is at its minimum when buildings facing both south and north are “L”-shaped enclosures and when they have no westward extension and their length ratio between eastward extended exterior walls and southward level exterior walls is 0.5:1.

scholarly journals A high-resolution air temperature data set for the Chinese Tian Shan in 1979–2016

2018 ◽  
Vol 10 (4) ◽  
pp. 2097-2114 ◽  
Author(s):  
Lu Gao ◽  
Jianhui Wei ◽  
Lingxiao Wang ◽  
Matthias Bernhardt ◽  
Karsten Schulz ◽  
...  
Keyword(s):  
High Resolution ◽  
Air Temperature ◽  
Socioeconomic Development ◽  
Temperature Data ◽  
Efficiency Coefficient ◽  
Data Set ◽  
High Resolution Data ◽  
Local Climate ◽  
Chinese Tianshan ◽  
Tian Shan

Abstract. The Chinese Tian Shan (also known as the Chinese Tianshan Mountains, CTM) have a complex ecological environmental system. They not only have a large number of desert oases but also support many glaciers. The arid climate and the shortage of water resources are the important factors restricting the area's socioeconomic development. This study presents a unique high-resolution (1 km, 6-hourly) air temperature data set for the Chinese Tian Shan (41.1814–45.9945∘ N, 77.3484–96.9989∘ E) from 1979 to 2016 based on a robust elevation correction framework. The data set was validated by 24 meteorological stations at a daily scale. Compared to original ERA-Interim temperature, the Nash–Sutcliffe efficiency coefficient increased from 0.90 to 0.94 for all test sites. Approximately 24 % of the root-mean-square error was reduced from 3.75 to 2.85 ∘C. A skill score based on the probability density function, which was used to validate the reliability of the new data set for capturing the distributions, improved from 0.86 to 0.91 for all test sites. The data set was able to capture the warming trends compared to observations at annual and seasonal scales, except for winter. We concluded that the new high-resolution data set is generally reliable for climate change investigation over the Chinese Tian Shan. However, the new data set is expected to be further validated based on more observations. This data set will be helpful for potential users to improve local climate monitoring, modeling, and environmental studies in the Chinese Tian Shan. The data set presented in this article is published in the Network Common Data Form (NetCDF) at https://doi.org/10.1594/PANGAEA.887700. The data set includes 288 nc files and one user guidance txt file.

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