Heat Islands
Tekst lavet ved hjælp af Google Gemini
Et urban heat island-fænomen, eller en by-varmeø, opstår når tætbebyggede byområder bliver væsentligt varmere end de omkringliggende landområder. Dette sker primært fordi materialer som asfalt og beton absorberer og fastholder solens varme i dagtimerne for derefter at afgive den langsomt om natten. Samtidig bidrager manglen på træer og grønne områder, som normalt køler luften gennem fordampning, samt den menneskelige aktivitet fra trafik og industri til, at temperaturen i byen stiger. Resultatet er et mikroklima, hvor byens centrum fungerer som en isoleret varmekilde i landskabet.
Natur i byerne gør hedebølger mindre uudholdelige https://globalnyt.dk/natur-i-byerne-goer-hedeboelger-mindre-uudholdelige/
Flere træer og mindre asfalt: Her er storbyerne, der gør klar til nye hedebølger https://www.kristeligt-dagblad.dk/udland/flere-traeer-og-mindre-asfalt-her-er-storbyerne-der-goer-klar-til-nye-hedeboelger
Onsdagens høje temperaturer var kun en forsmag på fremtidens varmebølger. Det stiller nye krav til byer og boliger https://www.kristeligt-dagblad.dk/danmark/onsdagens-hoeje-temperaturer-var-kun-en-forsmag-paa-fremtidens-varmeboelger-det-stiller-nye
Urban Heat Island https://education.nationalgeographic.org/resource/urban-heat-island/
National Geographic
An urban heat island, or UHI, is a metropolitan area that's a lot warmer than the rural areas surrounding it.
An urban heat island, or UHI, is a metropolitan area that's a lot warmer than the rural areas surrounding it. Heat is created by energy from all the people, cars, buses, and trains in big cities like New York, Paris, and London. Urban heat islands are created in areas like these: places that have lots of activity and lots of people.
What Is an Urban Heat Island? https://climatekids.nasa.gov/heat-islands/
NASA
An urban heat island occurs when a city experiences much warmer temperatures than nearby rural areas. The difference in temperature between urban and less-developed rural areas has to do with how well the surfaces in each environment absorb and hold heat.
UCAR
Heat islands form as vegetation is replaced by asphalt and concrete for roads, buildings, and other structures necessary to accommodate growing populations. These surfaces absorb - rather than reflect - the sun's heat, causing surface tem-peratures and overall ambient temperatures to rise.
- Size and shape of cities
- Urban deserts
- Urban canyons
- Humidity effects
- Urban haze
- Anthropogenic heat
Heat Island Effect https://www.epa.gov/heatislands
EPA
Heat islands are urbanized areas that experience higher temperatures than outlying areas. Structures such as buildings, roads, and other infrastructure absorb and re-emit the sun's heat more than natural landscapes such as forests and water bodies. Urban areas, where these structures are highly concentrated and greenery is limited, become "islands" of higher temperatures relative to outlying areas.