德黑兰大都市昼夜SUHI的时空分析及其与土地利用、NDVI和空气污染物的关系

IF 2.3 Q2 REMOTE SENSING
Firouz Aghazadeh, Samaneh Bageri, Mohammad Kazemi Garajeh, Mohammad Ghasemi, Shiba Mahmodi, Ehsan Khodadadi, Bakhtiar Feizizadeh
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引用次数: 0

摘要

城市热岛领域应该调查和监测的基本因素之一是对其时空变化的探索和检测,这在空间统计学中已经得到了很好的解决。本研究旨在检测德黑兰大都市地表城市热岛(SUHI)在月尺度和季节尺度上以及在一年中的温暖和寒冷时期的昼夜时空变化。首次研究了20年期间(2001-2020年)由MODIS/006/MOD11A1提取的日间/夜间地表温度(LST)和由MODIS-006/MOD13A2提取的NDVI等许多因素的后果。然后,计算研究区域的SUHI指数。下一阶段将研究热岛与城市土地利用(交通、人口密度、机场等)、空气污染物(CO、NO2、SO2等)和NDVI之间的相关性。最后,使用Moran算法测量空间自相关,并使用Gi统计量分析冷点和暖点。结果表明,LST在白天/夜间呈恒定趋势,NDVI也有轻微上升趋势。SUHI地图的结果表明,在温暖和寒冷的季节,白天有热岛的区域位于城市的南部、东南部和西部。夜间,城市中心区以及东部和东南部的一些地区出现了更高的热岛效应。热岛与土地利用、植被和空气污染物之间的相关性结果表明,随着时间的推移,热岛与机场和工业用地之间存在直接相关性,而与其他土地利用呈负相关。在夜间,所有的土地利用都与热岛直接相关。在空气污染物方面,PM2.5和PM10在白天/晚上与热岛最相关,而其他污染物则呈负相关。热岛和NDVI在白天/夜间也呈负相关。OLS(普通最小二乘法)模型结果还表明,一年中寒冷时期白天/夜间的R2值分别为0.70和0.59,而温暖时期的R2值为0.69和0.68。全球Moran的I和G*I统计结果还表明,德黑兰大都市的热岛具有集群分布的空间结构,其中南部、西部、西南部和北部白天有暖点,夜间有冷点。此外,北部和东北部白天有冷点,中部和东部夜间有暖点。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Spatial-temporal analysis of day-night time SUHI and its relationship between urban land use, NDVI, and air pollutants in Tehran metropolis

One of the basic factors that should be investigated and monitored in the field of urban heat islands is the exploration and detection of their spatiotemporal changes, which have been well addressed in spatial statistics. The current study aimed to detect the spatiotemporal changes of surface urban heat islands (SUHI) in Tehran metropolis during the daytime/nighttime at monthly and seasonal scales and over the warm and cold periods of the year. The consequences of many elements like as daytime/nighttime land surface temperature (LST) extracted by the MODIS/006/MOD11A1 and the NDVI extracted by MODIS/006/MOD13A2 over a 20-year period (2001–2020) were first investigated. Then, the SUHI index was computed for the study area. The correlations between the heat islands and urban land use (traffic, population density, airport, etc.), air pollutants (CO, NO2, SO2, etc.), and NDVI were investigated in the next stage. Finally, Moran’s algorithm was used to measure the spatial autocorrelation, and Gi statistic was used to analyze the cold and warm spots. The results indicated that the LST trend was constant during the daytime/nighttime, and the NDVI also had a slight rising trend. The results of the SUHI maps indicated that the zones with heat islands during the daytime over the seasons’ warm and cold times are located in the south, southeast, and west of the city. During the nighttime, the central zones of the city as well as some parts in the east and southeast have had higher heat islands. The results of the correlation between the heat islands and land use, vegetation, and air pollutants indicated a direct correlation between the heat islands and the airport and industrial land use over time, while it was inversely correlated with other land uses. During the nighttime, all land uses had a direct correlation with the heat islands. Regarding the air pollutants, PM2.5 and PM10 were most correlated with the heat islands during both daytime/nighttime while other pollutants have been inversely correlated. The heat islands and the NDVI were also inversely correlated during both daytime/nighttime. The OLS (ordinary least-squares) model results also indicated that the R2 values during the daytime/nighttime were 0.70 and 0.59, respectively, over the cold period of the year, compared to values of 0.69 and 0.68 over the warm period of the year. The results of global Moran’s I and G*i statistics also indicated that the heat islands of the Tehran metropolis had a spatial structure distributed in a cluster in which the southern, western, southwestern, and northern parts had warm spots during the daytime and cold spots during the nighttime. Moreover, the northern and northeastern parts had cold spots during the daytime, and the central and eastern parts had warm spots during the nighttime.

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来源期刊
Applied Geomatics
Applied Geomatics REMOTE SENSING-
CiteScore
5.40
自引率
3.70%
发文量
61
期刊介绍: Applied Geomatics (AGMJ) is the official journal of SIFET the Italian Society of Photogrammetry and Topography and covers all aspects and information on scientific and technical advances in the geomatics sciences. The Journal publishes innovative contributions in geomatics applications ranging from the integration of instruments, methodologies and technologies and their use in the environmental sciences, engineering and other natural sciences. The areas of interest include many research fields such as: remote sensing, close range and videometric photogrammetry, image analysis, digital mapping, land and geographic information systems, geographic information science, integrated geodesy, spatial data analysis, heritage recording; network adjustment and numerical processes. Furthermore, Applied Geomatics is open to articles from all areas of deformation measurements and analysis, structural engineering, mechanical engineering and all trends in earth and planetary survey science and space technology. The Journal also contains notices of conferences and international workshops, industry news, and information on new products. It provides a useful forum for professional and academic scientists involved in geomatics science and technology. Information on Open Research Funding and Support may be found here: https://www.springernature.com/gp/open-research/institutional-agreements
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