...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Geophysical Research Letters >Growth of fluoroform (CHF3, HFC-23) in the background atmosphere
【24h】

Growth of fluoroform (CHF3, HFC-23) in the background atmosphere

机译：氟仿（CHF3，HFC-23）在背景大气中的生长

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

There is growing concern over the emission and accumulation of very long-lived fluorinated trace gases in the atmosphere, due to their large global warming potentials (GWPs). Unlike CFCs and other ozone-depleting, chlorinated and brominated chemicals, consumption of these fluorinated compounds is not controlled by the Montreal Protocol or any other international agreement. Of all the known and potential trace 'greenhouse' gases, the two with the highest GWPs are sulfur hexafluoride (SF6) and fluoroform (CHF3, HFC-23). Whereas several studies have reported the detection and accumulation of SF6 in the atmosphere, the presence of HFC-23 has remained unreported. We have found that present-day HFC-23 concentrations (c. 11 pptv in late 1995) exceed those of SF6 by a factor of three. Concentrations have steadily increased in the atmosphere since at least 1978, and are continuing to do so at a present rate of 5% per year. Furthermore, HFC-23 appears to be long-lived in the atmosphere, with a stratospheric lifetime of at least 1000 years, and a modelled tropospheric lifetime of 230 years. In terms of global warming, the cumulative emissions of HFC-23 up to, and including, 1995 are equivalent to 1.6 billion tonnes of CO2. [References: 25]
机译：由于寿命长的氟化痕量气体具有很大的全球变暖潜能，因此人们越来越关注它们的排放和积累。与氟氯化碳和其他消耗臭氧层的氯化和溴化化学品不同，这些氟化物的消费不受《蒙特利尔议定书》或任何其他国际协议的控制。在所有已知和潜在的痕量“温室气体”中，具有最高GWP的两种气体是六氟化硫（SF6）和氟仿（CHF3，HFC-23）。尽管有几项研究报告了大气中SF6的检测和积累，但尚未报告HFC-23的存在。我们发现，当今的HFC-23浓度（1995年底约为11 pptv）比SF6高出三倍。至少从1978年以来，大气中的浓度一直稳定增长，并且目前以每年5％的速度持续增长。此外，HFC-23似乎在大气中寿命很长，平流层寿命至少为1000年，对流层模型寿命为230年。就全球变暖而言，直到1995年（含1995年）的HFC-23累积排放量相当于16亿吨二氧化碳。 [参考：25]

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号