Muhammad Usman , Janet E. Nichol , Ayman M. Abdallah , Muhammad Bilal
{"title":"基于遥感的低层城市热岛特征分析","authors":"Muhammad Usman , Janet E. Nichol , Ayman M. Abdallah , Muhammad Bilal","doi":"10.1016/j.uclim.2025.102433","DOIUrl":null,"url":null,"abstract":"<div><div>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 (<em>LST</em>)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 <em>LST</em> and air temperatures, <em>LST</em> 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 <em>LST</em> 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 <em>LST</em> 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.</div></div>","PeriodicalId":48626,"journal":{"name":"Urban Climate","volume":"61 ","pages":"Article 102433"},"PeriodicalIF":6.0000,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Characterising the Urban Heat Island in a low-rise indigenous city using remote sensing\",\"authors\":\"Muhammad Usman , Janet E. Nichol , Ayman M. Abdallah , Muhammad Bilal\",\"doi\":\"10.1016/j.uclim.2025.102433\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>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 (<em>LST</em>)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 <em>LST</em> and air temperatures, <em>LST</em> 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 <em>LST</em> 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 <em>LST</em> 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.</div></div>\",\"PeriodicalId\":48626,\"journal\":{\"name\":\"Urban Climate\",\"volume\":\"61 \",\"pages\":\"Article 102433\"},\"PeriodicalIF\":6.0000,\"publicationDate\":\"2025-04-30\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Urban Climate\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S221209552500149X\",\"RegionNum\":2,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"ENVIRONMENTAL SCIENCES\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Urban Climate","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S221209552500149X","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}
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.
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[...]