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See full article\/ Veure l’article complet: https:\/\/doi.org\/10.1016\/j.uclim.2021.100863<\/a><\/strong><\/p>\n English:<\/strong><\/p>\n The frequency and intensity of heat waves (HW) in cities are on the rise due to climate change as well as urban fabric materials and\u00a0anthropogenic activities<\/a>\u00a0that affect heat accumulation. The efficacy of HW\u00a0mitigation strategies<\/a>\u00a0depends on a city’s specific and unique morphology,\u00a0land use<\/a>, building materials, climate and geography. In this study, we show the effectiveness of cool roofs and vegetation in reducing temperature in the Metropolitan Area of Barcelona (AMB). We use the Weather and Research\u00a0Forecasting<\/a> (WRF) model with the urban scheme BEP+BEM, including 11 urban classes to simulate a HW that occurred in August 2015. We find that cool roofs reduce temperature best during the day (0.67\u00a0\u00b0C average and 2.22\u00a0\u00b0C maximum reductions), while additional green areas moderate temperatures to a lesser degree but also more evenly during the day and at night (average reductions of 0.15\u00a0\u00b0C and 0.17\u00a0\u00b0C, respectively). However, when irrigation is increased, the temperature reduction during the day is intensified due to the cooling effect of more\u00a0evapotranspiration<\/a>. The thermal regulation of combining the two strategies is the most evenly distributed over the AMB and has the highest impact, with an average and maximum reduction of 1.26\u00a0\u00b0C and 4.73\u00a0\u00b0C at 13:00UTC.<\/span><\/p>\n Catal\u00e0:<\/strong><\/p>\n La freq\u00fc\u00e8ncia i intensitat de les onades de calor (HW) a les ciutats est\u00e0 incrementant a causa del canvi clim\u00e0tic i tamb\u00e9 dels materials de construcci\u00f3 i les activitats antropog\u00e8niques que incrementen l’acumulaci\u00f3 de calor. L’efic\u00e0cia de les estrat\u00e8gies de mitigaci\u00f3 d’onada de calor dep\u00e8n de la morfologia espec\u00edfica de cada ciutat, aix\u00ed com l’\u00fas del s\u00f2l, clima i geografia. En aquest estudi es mostra l’efectivitat dels sostres freds (blancs) i la vegetaci\u00f3 pel que fa a reducci\u00f3 de temperatura a l’\u00c0rea Metropolitana de Barcelona (AMB). S’utilitza el model meteorol\u00f2gic “Weather and Research Forecasting” (WRF) amb l’esquema urb\u00e0 BEP+BEM, el qual inclou 11 classes urbanes per simular l’onada de calor que va succeir l’agost de 2015. Hem descobert que els sostres freds redueixen m\u00e9s la temperatura durant les hores di\u00fcrnes (0.67\u00baC de mitjana i 2.22\u00baC de reducci\u00f3 m\u00e0xima), mentre que les zones verdes\u00a0 redueixen la temperatura en menor mesura, per\u00f2 ho fa m\u00e9s al llarg de la nit (reducci\u00f3 mitjana de 0.15\u00baC i 0.17\u00baC respectivament). Malgrat aix\u00f2, quan s’incrementa la irrigaci\u00f3, la reducci\u00f3 de temperatura di\u00fcrna millora notablement gr\u00e0cies a l’efecte de refredament causat per l’evapotranspiraci\u00f3. La regulaci\u00f3 t\u00e8rmica que resulta de la combinaci\u00f3 de les dues estrat\u00e8gies \u00e9s la m\u00e9s homog\u00e8nia a l’AMB i la que te major impacte, amb una reducci\u00f3 mitjana de 1.26\u00baC i m\u00e0xima de 4.73\u00baC a les 13:00UTC.<\/p>\n Figure:<\/strong>\u00a0Reference case averages of three days during the heat wave: a) Temperature 2 m (with wind direction) daytime, b) Temperature 2 m (with wind direction) nightime, c) RH daytime, d) RH nighttime.<\/p>\n Figura:<\/strong>\u00a0Mitjana dels tres dies d’onada de calor pels casos de refer\u00e8ncia: a) Temperatura di\u00fcrna a 2m (amb direcci\u00f3 del vent), b) Temperatura nocturna (amb direcci\u00f3 del vent), c) Humitat relativa di\u00fcrna, d) Humitat relativa nocturna.<\/p>\n <\/p>\n","protected":false},"excerpt":{"rendered":" In this study, we show the effectiveness of cool roofs and vegetation in reducing temperature in the Metropolitan Area of Barcelona (AMB). We use the Weather and Research\u00a0Forecasting (WRF) model with the urban scheme BEP+BEM.<\/p>\n","protected":false},"author":3153,"featured_media":1083,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1069","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-general"],"_links":{"self":[{"href":"https:\/\/webs.uab.cat\/atmosphere\/wp-json\/wp\/v2\/posts\/1069","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=1069"}],"version-history":[{"count":0,"href":"https:\/\/webs.uab.cat\/atmosphere\/wp-json\/wp\/v2\/posts\/1069\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/webs.uab.cat\/atmosphere\/wp-json\/wp\/v2\/media\/1083"}],"wp:attachment":[{"href":"https:\/\/webs.uab.cat\/atmosphere\/wp-json\/wp\/v2\/media?parent=1069"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/webs.uab.cat\/atmosphere\/wp-json\/wp\/v2\/categories?post=1069"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/webs.uab.cat\/atmosphere\/wp-json\/wp\/v2\/tags?post=1069"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
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