{"id":1864,"date":"2022-09-27T12:32:04","date_gmt":"2022-09-27T10:32:04","guid":{"rendered":"https:\/\/urbag.eu\/?p=1864"},"modified":"2022-09-27T12:32:04","modified_gmt":"2022-09-27T10:32:04","slug":"new-publication-in-urban-climate","status":"publish","type":"post","link":"https:\/\/webs.uab.cat\/atmosphere\/2022\/09\/27\/new-publication-in-urban-climate\/","title":{"rendered":"New publication in “Urban Climate”"},"content":{"rendered":"

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See full article\/ Veure l’article complet<\/strong><\/a><\/p>\n

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English:<\/strong><\/p>\n

Street trees are an important driver of street\u00a0microclimate<\/a>\u00a0through shading and transpirative cooling, which are key mechanisms for improving thermal comfort in urban areas.\u00a0Urban canopy<\/a>\u00a0models (UCM) with integrated trees are useful tools because they represent the impacts of street trees on neighborhood-scale climate, resolving the interactions between buildings, trees and the atmosphere. In this study, we present the results of a measurement campaign where vehicle transects were completed along two similar parallel streets of Barcelona with different tree densities, recording upward and downward radiation fluxes, air temperature and humidity at street level. These observations are used to evaluate and improve the multi-layer UCM Building Effect Parameterization with Trees (BEP-Tree). Prior simulations of the model revealed insufficient heat exchange between the canyon surfaces and the air at the lowest vertical levels inside the deep canyons, which we solve by including turbulent buoyancy driven\u00a0wind velocity<\/a>\u00a0in the model. Air temperatures are on average 1.3\u00a0\u00b0C higher in the street with sparser trees when wind direction is perpendicular to the streets. The BEP-Tree simulations demonstrate good agreement with the observations in terms of temperature and radiation, and capture the diurnal evolution of temperature and radiation between the two streets.<\/p>\n

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Catal\u00e0:<\/strong><\/p>\n

L’arbrat viari \u00e9s un important motor del microclima<\/a> viari a trav\u00e9s de l’ombra i el refredament generat per la transpiraci\u00f3, els quals s\u00f3n mecanismes clau per millorar el confort t\u00e8rmic a les zones urbanes. \u00a0Els models de “urban canopy”<\/a> (UCM) amb arbres integrats s\u00f3n eines \u00fatils perqu\u00e8 representen els impactes de l’arbrat viari en el clima a escala de barri, resolent les interaccions entre edificis, arbres i atmosfera. En aquest estudi presentem els resultats d’una campanya de mesures on es van completar els transsectes amb vehicle al llarg de dos carrers paral\u00b7lels similars de Barcelona amb diferents densitats d’arbres, registrant fluxos de radiaci\u00f3 ascendents i descendents, temperatura de l’aire i humitat a peu de carrer. Aquestes observacions s’utilitzen per avaluar i millorar la parametritzaci\u00f3 de l’efecte de construcci\u00f3 de la UCM multicapa amb arbres (BEP-Tree). Simulacions pr\u00e8vies del model van revelar un intercanvi de calor insuficient entre les superf\u00edcies del carrer i l’aire als nivells verticals m\u00e9s baixos de l’interior dels canons profunds, que solucionem incloent la velocitat del vent impulsada per la turbul\u00e8ncia en el model. Les temperatures de l’aire s\u00f3n de mitjana 1,3 \u00b0C m\u00e9s altes al carrer amb arbres escassos quan la direcci\u00f3 del vent \u00e9s perpendicular als carrers. Les simulacions BEP-Tree demostren una bona conformitat amb les observacions en termes de temperatura i radiaci\u00f3, i capturen l’evoluci\u00f3 di\u00fcrna de la temperatura i la radiaci\u00f3 entre els dos carrers.<\/p>\n

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Figure: Modelled with the default BEP-Tree model (BT def., dashed lines), the BEP-Tree with the buoyancy driven wind speed (BT w*, straight lines) and observed (Obs., circles) canyon averaged road surface temperature (a) and air temperature (at 1.5 m height from the ground) (b) for Sparsely_treed (blue) and Densely_treed (green) streets in Barcelona. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.) \/\/ Simulat amb el model BEP-Tree per defecte (BT def., l\u00ednies discont\u00ednues), el BEP-Tree amb la velocitat del vent impulsada per la turbul\u00e8ncia (BT w*, l\u00ednies rectes) i observat (Obs., cercles) la temperatura mitjana de la superf\u00edcie de la carretera (a ) i temperatura de l’aire (a 1,5 m d’al\u00e7ada del terra) (b) per als carrers Sparsely_treed (blau) i Densely_treed (verd) de Barcelona. (Per a la interpretaci\u00f3 de les refer\u00e8ncies al color en aquesta llegenda de la figura, es remet al lector a la versi\u00f3 web d’aquest article.)<\/p>\n","protected":false},"excerpt":{"rendered":"

Title: How do street trees affect urban temperatures and radiation exchange? Observations and numerical evaluation in a highly compact city \/<\/p>\n

Street trees are an important driver of street\u00a0microclimate\u00a0through shading and transpirative cooling, which are key mechanisms for improving thermal comfort in urban areas.\u00a0Urban canopy\u00a0models (UCM) with integrated trees are useful tools because they represent the impacts of street trees on neighborhood-scale climate.<\/p>\n","protected":false},"author":3153,"featured_media":1873,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[7,16,155,156,157,158,159,160,161,162,163,164,10,165,166,62],"class_list":["post-1864","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-general","tag-amb","tag-barcelona","tag-bep-tree","tag-clima","tag-climate","tag-confort-termic-temperatura","tag-radiacio","tag-radiation","tag-temperature","tag-thermal-comfort","tag-trees","tag-ucm","tag-urbag","tag-urban-canopy","tag-urban-climate","tag-wrf"],"_links":{"self":[{"href":"https:\/\/webs.uab.cat\/atmosphere\/wp-json\/wp\/v2\/posts\/1864","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/webs.uab.cat\/atmosphere\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/webs.uab.cat\/atmosphere\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/webs.uab.cat\/atmosphere\/wp-json\/wp\/v2\/users\/3153"}],"replies":[{"embeddable":true,"href":"https:\/\/webs.uab.cat\/atmosphere\/wp-json\/wp\/v2\/comments?post=1864"}],"version-history":[{"count":0,"href":"https:\/\/webs.uab.cat\/atmosphere\/wp-json\/wp\/v2\/posts\/1864\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/webs.uab.cat\/atmosphere\/wp-json\/wp\/v2\/media\/1873"}],"wp:attachment":[{"href":"https:\/\/webs.uab.cat\/atmosphere\/wp-json\/wp\/v2\/media?parent=1864"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/webs.uab.cat\/atmosphere\/wp-json\/wp\/v2\/categories?post=1864"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/webs.uab.cat\/atmosphere\/wp-json\/wp\/v2\/tags?post=1864"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}