Modeling Urban Heat Islands and Thermal Comfort During a Heat Wave Event in East China With CLM5 Incorporating Local Climate Zones

Journal of Geophysical Research Atmospheres, Год журнала: 2023, Номер 128(16)

Опубликована: Авг. 7, 2023

Abstract The urban expansion‐induced heat can exacerbate stress for dwellers, especially during waves. With a focus on the intra‐urban variability of islands (UHIs) and thermal comfort, parameterization within Community Land Model version 5 (CLM5) was modified incorporating local climate zones (LCZs) framework, named CLM5‐LCZs, to simulate wave (HW) event in summer 2013. evaluation model performance demonstrated that it did reasonable job simulating surface energy balance regimes cities against observational fluxes from flux tower measurement site temperatures automatic meteorological stations Nanjing, China. Then we investigated characteristics causes UHIs associated with background climate, inhomogeneity HW intensity East results exhibited daytime nighttime canopy island (CUHII) were highest Compact Low Rise (LCZ3) High (LCZ1) areas, respectively, while (SUHII) peaked Large (LCZ8) areas nighttime, respectively. Urban dwellers easier exposed serious environment LCZ3 LCZ1 over north subtropical zone. Contrasts CUHII SUHII among different classes could exceed 1.7°C 5.4°C. heterogeneity may alter dominant factors controlling SUHII, which also modulated by intensity. Unlike other factors, impact contribution urban‐rural contrast convection efficiency larger than features. Overall, CLM5‐LCZs displayed potential implementing detailed simulations inter‐ intra‐city at scale, enhancing capabilities modeling exploring controls UHIs.

Язык: Английский

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Higher UHI Intensity, Higher Urban Temperature? A Synthetical Analysis of Urban Heat Environment in Urban Megaregion

Remote Sensing, Год журнала: 2023, Номер 15(24), С. 5696 - 5696

Опубликована: Дек. 12, 2023

Urban heat islands (UHIs) aggravate urban stress and, therefore, exacerbate heat-related morbidity and mortality as global warming continues. Numerous studies used surface island intensity (SUHII) to quantify the change in UHI effect its drivers for mitigation. However, whether variations SUHII among cities can demonstrate physical difference fluctuation of thermal environment is poorly understood. Here, we present a comparison study on temporal trends LST nonurban areas 13 Beijing–Tianjin–Hebei (BTH) megaregion China further identify different types changes based land temperature (LST) from 2000 2020. We also measured four socioecological factors (i.e., population density, vegetation greenness (EVI), GDP, built-up area) understand dynamic interaction between development. found following. (1) Nine out thirteen showed significant increasing trend SUHII, indicating that SUHI effects have been intensified most BTH megaregion. (2) The spatial pattern summer mean varied greatly. Among cities, Beijing had highest but Handan temperature, which suggests city with stronger does not necessarily higher or hazardous environment. (3) Four were identified resulted areas. In particular, one type seven greater (increasing LST) than (SUHII↑1), another Chengde was attributed cooling (decreasing (SUHII↑2). Meanwhile, third Zhangjiakou due (SUHII↑3). contrast, three decreasing caused by increase areas, (SUHII↓1). (4) relationship (TrendSUHII) (Trendpopulation TrendGDP per captica, TrendEVI, Trendbuild-up area), significantly positive correlation TrendSUHII TrendEVI indicated related an increased rate EVI. This mainly because would result lower temperatures

Язык: Английский

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Supporting Design to Develop Rural Revitalization through Investigating Village Microclimate Environments: A Case Study of Typical Villages in Northwest China

International Journal of Environmental Research and Public Health, Год журнала: 2022, Номер 19(14), С. 8310 - 8310

Опубликована: Июль 7, 2022

China has the largest number of villages in world, and research on rural microclimate will contribute to global climate knowledge. A three-by-three grid method was developed explore village microclimates through field measurement ENVI-met simulation. regression model used mechanistic relationship between spatial morphology, predicted mean vote (PMV) selected evaluate outdoor thermal comfort. The results showed that able microclimate, as Pearson’s correlation coefficient greater than 0.8 absolute percentage error (MAPE) from 2.16% 3.79%. Moreover, air temperature west–east road slightly higher south–north, especially morning. height-to-width ratio (H/W) most significant factor affect compared building coverage (PBC) wind speed. In addition, H/W had a relatively strong negative when 0.52 0.93. PMV indicated downwind edge area prevailing comfortable. This study provides data support reference for optimizing land use, mediating living environment, promoting revitalization.

Язык: Английский

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Investigation Of Emissions And Fuel Consumption In Diesel-Engine Vehicles During Idle Conditions

Deleted Journal, Год журнала: 2024, Номер 8(1), С. 29 - 29

Опубликована: Март 30, 2024

Idling engines when automobiles are not moving leads to inefficient fuel consumption and may harm human health the environment. No scientific reports have evaluated effects of idling diesel on public wastage in Malaysia; thus, a study is required. This work aims characteristics emissions, heat dissipation, due operations diesel-engine vehicles under idle concerning The was conducted by measuring emissions during conditions using various instruments, namely gas analyser, particulate matter monitor, temperature sensor, meter at selected locations where heavy were commonly found left with engines. It that idling-vehicle vicinity pedestrians far higher than limits set Malaysia Ambient Air Quality Standard 2020, implying an unhealthy practice. levels also 15 200 times more standard limit. silent hazard would be detrimental public, leading problems. Furthermore, it lead hefty medical bills for government. emission high, discomfort issues passersby. From economic point view, waste from exorbitantly thus suggesting authorities should regulate practice Keywords: engine, wastage, emission, engines, pollutant

Язык: Английский

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