基于遥感的低层城市热岛特征分析

IF 6 2区 工程技术 Q1 ENVIRONMENTAL SCIENCES
Muhammad Usman , Janet E. Nichol , Ayman M. Abdallah , Muhammad Bilal
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引用次数: 0

摘要

这项研究评估了尼日利亚卡诺这个低海拔半干旱城市的城市温度。在过去40年里,大规模的城市增长引发了人们对城市化对家庭影响的担忧,因为热浪更频繁,电力供应也更差。对MODIS地表温度(LST)进行了研究,以表征潜在的城市热岛(UHI)效应和20年来城市温度的变化。由于该研究表明卫星地表温度与气温之间存在很强的关系,因此地表温度被用于评估城市化对当地气候的影响。在这项为期20年的研究中,城市地区的日最高气温至少上升了1.5摄氏度,而农村地区则上升了0.8摄氏度。大部分城市地区的年夜间地表温度在晚上10点30分增加了3.2°C,夏季增加了3.6°C。城市气温上升幅度大于农村地区,夜间气温上升幅度大于白天,都归因于热岛效应。观测到的夏季白天地表城市冷岛(sui)令人惊讶,因为其他地方的白天sui要么归因于高层建筑,要么归因于植被繁茂,而卡诺不是。此外,当地气候站的气温表明,夏季白天的热岛指数约为9°C。这种差异可能是由于使用镀锌金属屋顶,其发射率低于卫星LST校准值。观测到的夏季夜间地表城市热岛强度(SUHII)平均6.6°C可能被低估了,因为实际地表温度将高于图像校准值。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Characterising the Urban Heat Island in a low-rise indigenous city using remote sensing
The study evaluates urban temperatures in the low-rise, semi-arid city of Kano, Nigeria. Massive urban growth over four decades raises concern about impacts of urbanisation on households, given more frequent heat waves and poor access to electricity supply. MODIS Land Surface Temperatures (LST)s are examined to characterise potential Urban Heat Island (UHI) effects, and changes in urban temperatures over two decades. As the study demonstrates strong relationships between satellite LST and air temperatures, LST is used to evaluate the effects of urbanisation on local climate. Over the 2-decade study, daily maximum air temperatures have risen by at least 1.5 °C in urban areas, compared to 0.8 °C in rural areas. Annual nighttime LST over much of the urban area has increased by up to 3.2 °C at 10:30 pm and summer shows an increase of up to 3.6 °C. Greater temperature increases for urban than rural areas, and for nighttime than daytime, are attributed to UHI effects. The observed summer daytime Surface Urban Cool Island (SUCI) is surprising, as daytime SUCIs elsewhere are attributed to either being high rise or well vegetated, which Kano is not. Furthermore, air temperatures from local climate stations indicate a summer daytime UHI approximating 9 °C. The disparity may be due to use of galvanised metal roofing, which has lower emissivity than values in satellite LST calibrations. The observed summer nighttime Surface Urban Heat Island Intensity (SUHII) averaging 6.6 °C may be an underestimate, as real surface temperatures would be higher than image calibrated values.
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来源期刊
Urban Climate
Urban Climate Social Sciences-Urban Studies
CiteScore
9.70
自引率
9.40%
发文量
286
期刊介绍: Urban Climate serves the scientific and decision making communities with the publication of research on theory, science and applications relevant to understanding urban climatic conditions and change in relation to their geography and to demographic, socioeconomic, institutional, technological and environmental dynamics and global change. Targeted towards both disciplinary and interdisciplinary audiences, this journal publishes original research papers, comprehensive review articles, book reviews, and short communications on topics including, but not limited to, the following: Urban meteorology and climate[...] Urban environmental pollution[...] Adaptation to global change[...] Urban economic and social issues[...] Research Approaches[...]
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