|
|
Perfluorotributylamine (PFTBA) 最近被加拿大研究人员发现存在于大气层。PFTBA是世界上目前为止最强大的温室气体。 PFTBA 被广泛用于半导体设备冷却已经有30年。导热系数0.86，是已知物质中最高的。化学性质稳定，自然降解需要500年。进入大气层后会破坏臭氧层，参与全球变暖。其效果远远超过二氧化碳，氟利昂和其他气体。这种物质进入大气层会给全球变暖带来新的恐慌。
做出这一发现的是多伦多大学的博士生 Angela Hong和她的导师Scott Mabury。
World's most potent greenhouse gas detected in atmosphere
A long-lived greenhouse gas more potent than any other — at least by one measure — has been detected in the atmosphere by Canadian researchers.
Perfluorotributylamine (PFTBA) has a radiative efficiency of 0.86 — the highest of any chemical found to date, reported chemists from the University of Toronto in a recent issue of Geophysical Research Letters. Radiative efficiency is one measure of a chemical's effectiveness at warming the climate, per part per billion of volume.
Greenhouse gases make the Earth warmer by absorbing and trapping heat that would otherwise escape from the atmosphere. The biggest contributor to climate change is carbon dioxide because its concentrations are so high — 393.1 parts per million in 2012 — and growing, thanks to human activity such as the burning of fossil fuels. However, many other gases with smaller concentrations also contribute.
全文：http://www.cbc.ca/news/technology/world-s-most-potent-greenhouse-gas-detected-in-atmosphere-1.2470604
|
|
|小黑屋|手机版 Mobile|Waterloo Region Chinese Canadian Association
发表于 2013-12-20 10:55:14