To cool the city has a coup: NASA for the greening the city
[abstract] the rapid flow of asphalt pavement and towering skyscrapers could easily turn city into a hot pockets.But America's space agency, NASA, according to a new study, a very simple change can cool for expanding cities.
NASA scientists found that planting green plants can be achieved for the purpose of city
According to foreign media reports, NASA's according to a new study, a very simple change can to cool the hot city: that's a lot of planting vegetation.
Concrete, asphalt, stone and steel and other building materials are very dense and not conducive to seepage, so that they can absorb the sun's heat, and constantly to the surrounding radiation.Resulted from the "heat island effect" of cities temperature than the surrounding suburbs of the city and rural areas were more than 2 to 5 degrees Fahrenheit.
This number sounds not big difference, but it is enough to increase the demand for air conditioning, resulting in energy usage.
Vegetation is a natural insulating layer.Plants will constantly absorb the moisture in the process of evapotranspiration, and then the moisture release back into the atmosphere.This will reduce the surface temperature, with our human sweat effect is the same: when sweat evaporate from your skin with thy part of body heat.
Researchers said in a research note, city compared with vegetation island, summer temperature is 3.4 degrees Fahrenheit, the winter is higher than 2.7 degrees Fahrenheit.So if the city can cover all the green plants, in theory, it can reduce to the island and the approximate temperature range.
Cities also need to choose the right vegetation planted, however, because some plants are more good at evapotranspiration.Broad-leaved
trees, for example, has more pores, so that they can release more moisture into the atmosphere.
If the city planners is committed to planting those released into the atmosphere of many water plants, they can be more effective to cool city, reduce the energy loss, and reduce the use of fossil fuels.
Involved in the study of a NASA climate scientist said in a news briefing: "the urbanization is a good phenomenon, it makes a lot of people gathered in a small range. Road, work, and for people to share information and buildings. But we may be able to let the city become better."