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Testing an energy exchange and microclimate cooling hypothesis for the effect of vegetation configuration on urban heat
Yan, Jingli; Zhou, Weiqi1,2; Jenerette, G. Darrel
2019-12-15
Source PublicationAGRICULTURAL AND FOREST METEOROLOGY
ISSN0168-1923
Volume279Pages:-
AbstractWhile an effect of urban vegetation configuration on land surface temperature (LST) has been identified worldwide, the mechanism underlying configuration-LST relationships remains unclear as most urban LST data only resolve to neighborhood scales. Here we ask: does urban vegetation provide more cooling arranged in fewer and larger patches or more numerous but smaller patches in the Phoenix metropolitan area, Arizona, USA? We hypothesized the combination of energy exchanges between adjacent patches and microclimate cooling induced by vegetation are key processes determining how configuration affects LST. Using high resolution thermal data (7 m), we evaluated predictions from this hypothesis through a multiple scale analysis spanning from within individual patches to among neighborhoods. We found tree cover is the dominant factor influencing urban cooling and that tree and grass configurations also substantially affect cooling, with effects generally exceeding 40% that of tree cover. The effects of tree and grass cover and configuration on LST were scale-dependent and reflect differences from within individual patches to among neighborhoods. In general, greater edge density and shape complexities of vegetation patches cool the landscape but may warm individual vegetation patches. Conversely, increasing individual vegetation patch size and reducing shape complexity may lead to cooler vegetation patches but a hotter landscape. Our findings suggest more edge area strengthens energy exchanges between vegetation and surroundings and more vegetation core area lead to greater cooling within individual patches. Through applications of high resolution thermal remote sensing, we are able to more directly connect effects of land cover composition and configuration to LST distributions that can help cities plan and evaluate local climate adaptation strategies.
Department城市与区域生态国家重点实验室
KeywordConfiguration Scale Urban Microclimate MASTER Remote sensing Vegetation
Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/42471
Collection城市与区域生态国家重点实验室
Affiliation1.Univ Calif Riverside, Dept Bot & Plant Sci, Riverside, CA 92521 USA
2.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Urban & Reg Ecol, 18 Shuangqing Rd, Beijing 100085, Peoples R China
3.Univ Chinese Acad Sci, 19 Yuquan Rd, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Yan, Jingli,Zhou, Weiqi,Jenerette, G. Darrel. Testing an energy exchange and microclimate cooling hypothesis for the effect of vegetation configuration on urban heat[J]. AGRICULTURAL AND FOREST METEOROLOGY,2019,279:-.
APA Yan, Jingli,Zhou, Weiqi,&Jenerette, G. Darrel.(2019).Testing an energy exchange and microclimate cooling hypothesis for the effect of vegetation configuration on urban heat.AGRICULTURAL AND FOREST METEOROLOGY,279,-.
MLA Yan, Jingli,et al."Testing an energy exchange and microclimate cooling hypothesis for the effect of vegetation configuration on urban heat".AGRICULTURAL AND FOREST METEOROLOGY 279(2019):-.
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