Eva Beele , Raf Aerts , Maarten Reyniers , Ben Somers
{"title":"绿地的空间布局很重要城市土地覆盖与气温之间的关系","authors":"Eva Beele , Raf Aerts , Maarten Reyniers , Ben Somers","doi":"10.1016/j.landurbplan.2024.105121","DOIUrl":null,"url":null,"abstract":"<div><p>Global warming and urbanization have exacerbated urban heat island issues in cities, affecting the liveability and long-term health and well-being of its citizens. This study explores how landscape composition and configuration regulate diurnal air temperature variations and the cooling potential of urban green spaces.</p><p>Using a spatially-dense citizen science weather station network in Leuven (Belgium), mean night temperature, mean day temperature, and diurnal temperature range were recorded during summer heat periods of 2022. Urban land cover data were collected at two buffer scales (50m and 250m) and analysed using composition (relative cover) and configuration metrics (aggregation and shape indices). Multiple linear (mixed) models were used to investigate associations between the composition and configuration of various land covers and air temperature at different temporal and spatial scales.</p><p>Results reveal dynamic effects of urban landscape on air temperature. A 10% increase in tree cover mitigated daytime warming by 0.11 °C, likely through shading and evapotranspiration. Aggregated trees further improved daytime cooling by 0.42 °C. A 10% increase in grasses and shrubs offered significant night-time cooling up to 0.47 °C, probably due to high albedo and ventilation potential. Additionally, increasing the aggregation of grasses and shrubs by 10% enhanced nocturnal cooling by 1.62 °C, while increasing the shape complexity of trees promotes night-time cooling by 0.44 °C.</p><p>This study further highlights the need for context-specific strategies. Conserving green locations as urban forests, while designing enclosed grey locations as urban savannas, characterized by interconnected grasses and shrubs interspersed with standalone trees, could mitigate urban heat stress and enhance urban resilience.</p></div>","PeriodicalId":54744,"journal":{"name":"Landscape and Urban Planning","volume":null,"pages":null},"PeriodicalIF":7.9000,"publicationDate":"2024-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Spatial configuration of green space matters: Associations between urban land cover and air temperature\",\"authors\":\"Eva Beele , Raf Aerts , Maarten Reyniers , Ben Somers\",\"doi\":\"10.1016/j.landurbplan.2024.105121\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Global warming and urbanization have exacerbated urban heat island issues in cities, affecting the liveability and long-term health and well-being of its citizens. This study explores how landscape composition and configuration regulate diurnal air temperature variations and the cooling potential of urban green spaces.</p><p>Using a spatially-dense citizen science weather station network in Leuven (Belgium), mean night temperature, mean day temperature, and diurnal temperature range were recorded during summer heat periods of 2022. Urban land cover data were collected at two buffer scales (50m and 250m) and analysed using composition (relative cover) and configuration metrics (aggregation and shape indices). Multiple linear (mixed) models were used to investigate associations between the composition and configuration of various land covers and air temperature at different temporal and spatial scales.</p><p>Results reveal dynamic effects of urban landscape on air temperature. A 10% increase in tree cover mitigated daytime warming by 0.11 °C, likely through shading and evapotranspiration. Aggregated trees further improved daytime cooling by 0.42 °C. A 10% increase in grasses and shrubs offered significant night-time cooling up to 0.47 °C, probably due to high albedo and ventilation potential. Additionally, increasing the aggregation of grasses and shrubs by 10% enhanced nocturnal cooling by 1.62 °C, while increasing the shape complexity of trees promotes night-time cooling by 0.44 °C.</p><p>This study further highlights the need for context-specific strategies. Conserving green locations as urban forests, while designing enclosed grey locations as urban savannas, characterized by interconnected grasses and shrubs interspersed with standalone trees, could mitigate urban heat stress and enhance urban resilience.</p></div>\",\"PeriodicalId\":54744,\"journal\":{\"name\":\"Landscape and Urban Planning\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":7.9000,\"publicationDate\":\"2024-05-28\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Landscape and Urban Planning\",\"FirstCategoryId\":\"93\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0169204624001208\",\"RegionNum\":1,\"RegionCategory\":\"环境科学与生态学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"ECOLOGY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Landscape and Urban Planning","FirstCategoryId":"93","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0169204624001208","RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ECOLOGY","Score":null,"Total":0}
Spatial configuration of green space matters: Associations between urban land cover and air temperature
Global warming and urbanization have exacerbated urban heat island issues in cities, affecting the liveability and long-term health and well-being of its citizens. This study explores how landscape composition and configuration regulate diurnal air temperature variations and the cooling potential of urban green spaces.
Using a spatially-dense citizen science weather station network in Leuven (Belgium), mean night temperature, mean day temperature, and diurnal temperature range were recorded during summer heat periods of 2022. Urban land cover data were collected at two buffer scales (50m and 250m) and analysed using composition (relative cover) and configuration metrics (aggregation and shape indices). Multiple linear (mixed) models were used to investigate associations between the composition and configuration of various land covers and air temperature at different temporal and spatial scales.
Results reveal dynamic effects of urban landscape on air temperature. A 10% increase in tree cover mitigated daytime warming by 0.11 °C, likely through shading and evapotranspiration. Aggregated trees further improved daytime cooling by 0.42 °C. A 10% increase in grasses and shrubs offered significant night-time cooling up to 0.47 °C, probably due to high albedo and ventilation potential. Additionally, increasing the aggregation of grasses and shrubs by 10% enhanced nocturnal cooling by 1.62 °C, while increasing the shape complexity of trees promotes night-time cooling by 0.44 °C.
This study further highlights the need for context-specific strategies. Conserving green locations as urban forests, while designing enclosed grey locations as urban savannas, characterized by interconnected grasses and shrubs interspersed with standalone trees, could mitigate urban heat stress and enhance urban resilience.
期刊介绍:
Landscape and Urban Planning is an international journal that aims to enhance our understanding of landscapes and promote sustainable solutions for landscape change. The journal focuses on landscapes as complex social-ecological systems that encompass various spatial and temporal dimensions. These landscapes possess aesthetic, natural, and cultural qualities that are valued by individuals in different ways, leading to actions that alter the landscape. With increasing urbanization and the need for ecological and cultural sensitivity at various scales, a multidisciplinary approach is necessary to comprehend and align social and ecological values for landscape sustainability. The journal believes that combining landscape science with planning and design can yield positive outcomes for both people and nature.