...
  • 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 >PHOTOCHEMICAL OXIDANT FORMATION OVER SOUTHERN SWITZERLAND .1. RESULTS FROM SUMMER 1994
【24h】

PHOTOCHEMICAL OXIDANT FORMATION OVER SOUTHERN SWITZERLAND .1. RESULTS FROM SUMMER 1994

机译：瑞士南部的光化学氧化剂形成1。 1994年夏季的结果

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

We present ground-based and aircraft measurements of photochemically relevant trace gases from the southern part of Switzerland from summer 1994, The region is adjacent to the P0 Valley and exhibits the highest ozone concentrations within Switzerland, O-3 concentrations of up to 166 parts per billion by volume (ppbv) were measured, Isoprene was 3 ppbv on the ground and 0.3 ppbv at 1000 m altitude on average in the afternoon and dominates the volatile organic compound (VOC reactivity toward OH at the ground. Measured HONO concentrations of 0.2 ppbv in the afternoon are much higher, as can be explained from gas phase reactions alone, Radical concentrations are derived from steady state calculations using ground-based measurements in the afternoon. The resulting concentrations for OH, HO2, and RO2 are 3.1 x 10(6), 1.1 x 10(9), and 1.3 x 10(9) molecules cm(-3), respectively. Isoprene and NO have the largest influence on the estimated OH concentration, followed by O-3, photolysis frequency of O-3, and HONO, HO2 and RO2 concentrations are most sensitive to changes in HONO, O-3, and photolysis frequency of O-3 The estimated radical production is larger than the NO, emissions, suggesting low-NO, chemistry. We calculated indicators for NOx or VOC Sensitivity and show that reduction of NOx emissions would be more efficient in reducing O-3 than VOC reduction upwind of the measurement site, [References: 53]
机译：我们提供了从1994年夏季开始对瑞士南部的光化学相关痕量气体进行地面和飞机测量，该区域毗邻P0谷，并展现了瑞士境内最高的臭氧浓度，O-3浓度最高为每份166份异戊二烯在地面上的测量值为十亿体积（ppbv），下午平均为异戊二烯，在海拔1000 m处平均为0.3 ppbv，并在挥发性有机化合物（VOC对OH的反应性）方面占主导地位。测得的HONO浓度为0.2 ppbv。下午的浓度要高得多，这可以从单独的气相反应中得出，自由基的浓度是通过使用下午的地面测量值从稳态计算得出的，得出的OH，HO2和RO2的浓度为3.1 x 10（6） ，分别为1.1 x 10（9）和1.3 x 10（9）分子cm（-3）的分子，异戊二烯和NO对估计的OH浓度影响最大，其次是O-3，光解频率O-3的浓度，以及HONO，HO2和RO2的浓度对HONO，O-3和O-3的光解频率的变化最敏感。估计的自由基产生量大于NOx的排放量，表明其化学性质低。我们计算了NOx或VOC敏感性的指标，结果表明，减少O-3的排放量要比测量地点上风处的VOC减少效率更高，[参考文献：53]

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