The influence of vegetation, mesoclimate and meteorology on urban atmospheric microclimates across a coastal to desert climate gradient

Crum, Steven M.; Shiflett, Sheri A.; Jenerette, G. Darrel

doi:10.1016/j.jenvman.2017.05.077

Cited by 22 publications

(13 citation statements)

References 54 publications

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“…As a result, the positive result from urbanization enables more inhabitants to enjoy the convenient life through living in cities. At the same time, urbanization has also incurred many significant negative changes, resulting in degraded urban ecosystem services in some aspects, such as loss of vegetated land, and has created heat islands, traffic jams, and air pollution [7,8]. Particularly, the continuously shrinking green vegetation space in urban and suburban areas has been a critical issue for sustainable urban development and public health in many cities [7].…”

Section: Introductionmentioning

confidence: 99%

“…At the same time, urbanization has also incurred many significant negative changes, resulting in degraded urban ecosystem services in some aspects, such as loss of vegetated land, and has created heat islands, traffic jams, and air pollution [7,8]. Particularly, the continuously shrinking green vegetation space in urban and suburban areas has been a critical issue for sustainable urban development and public health in many cities [7]. It was reported that nine out of thirteen cities in England had exhibited declined extent in urban vegetation cover during 2000-2008 [9].…”

Section: Introductionmentioning

confidence: 99%

“…Vegetation supports sustainable urban development [7,13]. As the principal component in the garden city concept (GCC), vegetation was found to have a consistent cooling effect on the canopy layer temperature in some tropical cities [14].…”

Section: Introductionmentioning

confidence: 99%

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Mapping the Changes in Urban Greenness Based on Localized Spatial Association Analysis under Temporal Context Using MODIS Data

Sha

Ali

Wang

et al. 2018

IJGI

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Vegetation plays an irreplaceable role for urban ecosystem services. Urban greenness represents all vegetation cover in and around cities. Understanding spatiotemporal patterns of the changes in urban greenness (CUG) provides fundamental clues for urban planning. The impact on CUG can be roughly categorized as being climate-induced and human-induced. Methods for mapping human-induced CUG (H-CUG) are rare. In this paper, a new framework, known as Localized Spatial Association Analysis under Temporal Context (LSAA-TC), was proposed to explore H-CUG. Localized spatial association analysis (LSAA) was performed first to extract local spatial outliers (LSOs), or locations that differ significantly in urban greenness from those located in the neighborhood. LSOs were then analyzed under the temporal context to map their intertemporal variations known as spatiotemporal outliers. We applied LSAA-TC to mapping H-CUG in the Wuhan Metropolitan Area, China during 2000–2015 using the vegetation index from Moderate-resolution Imaging Spectroradiometer (MODIS) 13Q1 as the proxy for urban greenness. The computed H-CUG demonstrated apparent spatiotemporal patterns. The result is consistent with the fact that the traditional downtown area presents the lowest H-CUG, while it is found that the peripheral area in the circular belt within 14–20 km from the urban center demonstrates the most significant H-CUG. We conclude that LSAA-TC can be a widely applicable framework to understand H-CUG patterns and is a promising tool for informative urban planning.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mapping the Changes in Urban Greenness Based on Localized Spatial Association Analysis under Temporal Context Using MODIS Data

Sha

Ali

Wang

et al. 2018

IJGI

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“…This was due to the paved surfaces, where densely populated and built‐up areas trap radiation and hence contribute to additional warming (Hamdi & Schayes, 2007) in STN5. Urban impermeable surfaces with high heat storage capacity absorb heat during the day and release it at night (Chakraborty, Kant, & Mitra, 2015; Crum, Shiflett, & Jenerette, 2017; Davis, Jung, Pijanowski, & Minor, 2016) leading to increased minimum air temperature. In contrast, the airport weather station that is located in an open space area in the east of the city is highly affected by the desert climate where the daily air temperature has a wide variance, and minimum air temperature can fall quite low (Elsharkawy & Elmallah, 2016; Mamtimin, Et‐Tantawi, Schaefer, Meixner, & Domroes, 2011).…”

Section: Discussionmentioning

confidence: 99%

“…Previous studies demonstrated the impact of urban vegetated areas on increasing the air humidity compared to built‐up areas covered by impervious materials (Bowler, Buyung‐Ali, Knight, & Pullin, 2010; Potchter, Cohen, & Bitan, 2006). Crum et al (2017) studied the impact of five different land covers including asphalt, bare surface, turfgrass, short trees and tall trees on local air temperature and relative humidity in Riverside, California. The highest relative humidity difference was observed between grass and asphalt surface cover.…”

Section: Discussionmentioning

confidence: 99%

Assessment of reference evapotranspiration across an arid urban environment having poor data monitoring system

Shafieiyoun

Gheysari

Khiadani

et al. 2020

Hydrological Processes

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Estimation of reference evapotranspiration (ET0) in urban areas is challenging but essential in arid urban climates. To evaluate ET0 in an urban environment and non‐urban areas, air temperature and relative humidity were measured at five different sites across the arid city of Isfahan, Iran, over 4 years. Wind speed and sunshine hours were obtained from an urban surrounding weather station over the same period and used to estimate ET0. Calculated ET0 was compared with satellite‐based ET0 retrieved from the MOD16A2 PET product. Although MODIS PET was strongly correlated with the Valiantzas equation, it overestimated ET0 and showed average accuracy (r = 0.93–0.94, RMSE = 1.18–1.28 mm/day, MBE = 0.73–0.84 mm/day). The highest ET0 differences between an urban green space and a non‐urban area were 1.1 and 0.87 mm/day, which were estimated by ground measurements and MODIS PET, respectively. The sensitivity of ET0 to wind speed and sunshine hours indicated a significant effect on cumulative ET0 at urban sites compared to the non‐urban site, which has a considerable impact on the amount of irrigation required in those areas. Although MODIS PET requires improvement to accurately reflect field level microclimate conditions affecting ET0, it is beneficial to hydrological applications and water resource managers especially in areas where data is limited. In addition, our results indicated that using limited data methods or meteorological data from regional weather stations, leads to incorrect estimation of ET0 in urban areas. Therefore, decision‐makers and urban planners should consider the importance of precisely estimating ET0 to optimize management of urban green space irrigation, especially in arid and semi‐arid climates such as the city of Isfahan.

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The use of green infrastructure and irrigation in the mitigation of urban heat in a desert city

Gao,

Haddad,

Paolini

et al. 2024

Build. Simul.

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Severe urban heat, a prevalent climate change consequence, endangers city residents globally. Vegetation-based mitigation strategies are commonly employed to address this issue. However, the Middle East and North Africa are under investigated in terms of heat mitigation, despite being one of the regions most vulnerable to climate change. This study assesses the feasibility and climatic implications of wide-scale implementation of green infrastructure (GI) for heat mitigation in Riyadh, Saudi Arabia—a representative desert city characterized by low vegetation coverage, severe summer heat, and drought. Weather research forecasting model (WRF) is used to simulate GI cooling measures in Riyadh’s summer condition, including measures of increasing vegetation coverage up to 60%, considering irrigation and vegetation types (tall/short). In Riyadh, without irrigation, increasing GI fails to cool the city and can even lead to warming (0.1 to 0.3 °C). Despite irrigation, Riyadh’s overall GI cooling effect is 50% lower than GI cooling expectations based on literature meta-analyses, in terms of average peak hour temperature reduction. The study highlights that increased irrigation substantially raises the rate of direct soil evaporation, reducing the proportion of irrigation water used for transpiration and thus diminishing efficiency. Concurrently, water resource management must be tailored to these specific considerations.

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The influence of vegetation, mesoclimate and meteorology on urban atmospheric microclimates across a coastal to desert climate gradient

Cited by 22 publications

References 54 publications

Mapping the Changes in Urban Greenness Based on Localized Spatial Association Analysis under Temporal Context Using MODIS Data

Mapping the Changes in Urban Greenness Based on Localized Spatial Association Analysis under Temporal Context Using MODIS Data

Assessment of reference evapotranspiration across an arid urban environment having poor data monitoring system

The use of green infrastructure and irrigation in the mitigation of urban heat in a desert city

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