Impact of the Urban Heat Island Effect on Ozone Pollution in Chengdu City, China

Chinese Geographical Science, Год журнала: 2023, Номер 33(6), С. 1017 - 1032

Опубликована: Сен. 13, 2023

With the advancement of urbanization, urban heat island effect and ozone pollution have become hot issues in research. The can impact conversion, but its mechanism action is unclear. In this study, effects on concentration Chengdu City, China, were investigated by comparing under different levels with data from March 2020 to February 2021 temperature wind field ERA5-Land during same period. results showed that: 1) regarding distribution characteristics, presented a 'high summer low winter' distribution. (189.54 µg/m3) was nearly twice that winter (91.99 µg/m3), diurnal variation 'single peak single valley' distribution, at 16:00. 2) For characteristics effect, intensity obviously higher spring than other seasons, trough values appearing 9:00 17:00, respectively. Spatially, eastern part island, while western northwestern parts mostly cold island. 3) correlation analysis between significant positive 7–8 h time lag. Ambient air not main factor affecting concentration. impacts two ways: changing local budget promote generation forming wind, which promotes diffusion or accumulation forms areas high values.

Язык: Английский

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Spatiotemporal Pattern Evolution of Urban Ecosystem Resilience Based on “Resistance-Adaptation-Vitality”: A Case Study of Nanchang City

Frontiers in Earth Science, Год журнала: 2022, Номер 10

Опубликована: Май 10, 2022

With the rapid development of economy and society in recent years, ecological environment has deteriorated significantly. The governments at all levels, departments, relevant scholars have begun to pay attention urban construction research on disaster prevention mitigation. concept resilience gained widespread this context. However, present, is still its infancy, there are many qualitative but few quantitative studies terms assessment methods. This study explores complex dynamic evolution mechanism ecosystem based three characteristics selects Nanchang, an important barrier middle lower reaches Yangtze River a model area for integrated management Great Lakes basin, as target. establishes measurement evaluation framework dimensions (resistance, adaptation, vitality) conducts comprehensive resilience. results show that trend land-use change from 1990 2020 mainly characterized by continuous decrease arable land (forestland, grassland, water) increase land, among which attitude largest, reaching 5.33% 2005. During period, overall Nanchang showed gradual decline was always moderate-to-low level, with long-term distribution pattern “low high surrounding areas” clear spatial heterogeneity. helps clarify security status regional provides reference exploring

Язык: Английский

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A Comparative Study of the Simulation Accuracy and Efficiency for the Urban Wind Environment Based on CFD Plug-Ins Integrated into Architectural Design Platforms

Buildings, Год журнала: 2022, Номер 12(9), С. 1487 - 1487

Опубликована: Сен. 19, 2022

The deterioration of the urban environment is a problem which has captured attention governmental departments and researchers, who are committed to improving from perspective optimizing morphology. Although many researchers have applied computational fluid dynamics (CFD) plug-ins study problems ventilation pollutant accumulation, studies on reliability simulation accuracy verification CFD currently scarce. Therefore, we used three based different architectural design platforms evaluate compare their operation difficulty, accuracy, efficiency through analysis results ventilation. This complements validation plug-in simulations guides planners architects in selection application plug-ins. show that generally underestimates wind speed at pedestrian level prediction poor wake area obstacles, especially with GH_Wind plug-in. Under 0° inflow direction, Butterfly were most consistent experimental values. When direction increased 22.5° 45°, Autodesk showed best accuracy. Overall, achieves balance between airflow simulation.

Язык: Английский

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Outdoor ventilation evaluation and optimization based on spatial morphology analysis in Macau

Urban Climate, Год журнала: 2022, Номер 46, С. 101335 - 101335

Опубликована: Ноя. 4, 2022

Язык: Английский

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Research on Time Series and Spatial Gradient of Urban Heat Island Expansion from the Perspective of Urban Renewal

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, Год журнала: 2023, Номер 16, С. 8680 - 8688

Опубликована: Янв. 1, 2023

Currently, Urban Heat Island (UHI) has evolved beyond being a homogeneous climate and environmental issue, it emerged as critical threat to the sustainable development of urban environment. This study highlights substantial spatio-temporal expansions UHIs in China between 2005 2020. Notably, heat island intensity (UHII) exhibited more pronounced increase during nighttime than daytime, with land surface temperature (LST) rises 0.46℃ 0.17℃, respectively. Analysis 48 representative cities revealed that although most experienced faster UHII growth rate new compared pre-existing ones, significant initial disparity hinders 2010 2015 from catching up short term. However, by 2025, is projected daytime will surpass 21 cities, while same trend expected 31 nighttime. Furthermore, spatial gradient analysis unveiled individual variations within different buffer rings. These findings provide valuable insights into expansion dynamics China, contributing understanding UHI effects. Moreover, these can inform renewal strategies aimed at mitigating UHI's adverse impacts, enhancing resilience, fostering livable cities.

Язык: Английский

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