• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >EFFECTS OF ELECTRON AND ION REACTIONS ON ATMOSPHERIC LIFETIMES OF FULLY FLUORINATED COMPOUNDS
【24h】

EFFECTS OF ELECTRON AND ION REACTIONS ON ATMOSPHERIC LIFETIMES OF FULLY FLUORINATED COMPOUNDS

机译：电子和离子反应对全氟化合物大气寿命的影响

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

Atmospheric lifetimes are evaluated for the fully fluorinated compounds CF4, C2F6, c-C4F8, C6F14, and SF6 using a two-dimensional transport and chemistry model which includes removal by electrons and ions in the mesosphere and lower thermosphere. Laboratory measurements of the pertinent reaction rates were carried out at thermal energy for free electrons and for the atmospheric ions O+, O-2(+) O-2(-), O-2(-), NO+, H3O+, NO3-, and CO3-. Atmospheric removal by electrons reduces the lifetimes of c-C4F8 and SF6 from about 3200 years to 1400 and 800 years, respectively, only if the respective product anions C4F8- and SF6- do not subsequently regenerate the parent neutral compounds. Atmospheric removal by ion reactions is minor or negligible, with the largest effect (similar to 5%) being removal of C6F14 by O-2(+). Removal of CF4 and C2F6 by O+ is probably the most important single destruction process in the atmosphere for these two compounds, but their lifetimes are governed by removal at the Earth's surface in high-temperature combustors. While we show that the lifetimes of c-C4F8 and SF6 may be significantly shorter than previously estimated, these compounds remain extremely long-lived with significant global warming potentials. [References: 37]
机译：使用二维迁移和化学模型（包括在中层和较低热层中被电子和离子去除），评估了全氟化化合物CF4，C2F6，c-C4F8，C6F14和SF6的大气寿命。对自由电子和大气离子O +，O-2（+）O-2（-），O-2（-），NO +，H3O +，NO3-，和CO3-。仅当相应的产物阴离子C4F8-和SF6-随后不使母体中性化合物再生时，电子除去大气后，c-C4F8和SF6的寿命才分别从约3200年减少到1400和800年。离子反应在大气中的去除很小或可以忽略不计，最大的影响（约5％）是由O-2（+）去除C6F14。 O +去除CF4和C2F6可能是这两种化合物在大气中最重要的单一破坏过程，但它们的寿命取决于高温燃烧室中地表的去除。尽管我们表明c-C4F8和SF6的寿命可能比以前估计的要短得多，但这些化合物的寿命非常长，具有明显的全球变暖潜能。 [参考：37]

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