• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Faraday discussions >A study of the trace gas columns of O_3,NO_2 and HCHO over Africa in September 1997
【24h】

A study of the trace gas columns of O_3,NO_2 and HCHO over Africa in September 1997

机译：1997年9月非洲O_3，NO_2和HCHO微量气柱研究

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

Retrievals of trace gas columns from the measurements of backscattered radiation by GOME (Global Ozone Monitoring Experiment) show that enhanced tropospheric columns of ozone (O_3),nitrogen dioxide (NO_2) and formaldehyde (HCHO),over the African continent occur frequently.This study focuses on the behaviour of trace gases over Africa in September 1997,a period impacted by the strongest known El Nino phase of the ENSO.It investigates our qualitative and quantitative understanding of the retrieved tropospheric trace gas column densities.The emissions of NO_x and volatile organic compounds (VOC) from biomass burning,biogenic sources and lightning and their photochemical transformation have been investigated.By performing a trajectory analysis,the transport of air masses from the different emission regions was analysed and the potential atmospheric spatial distribution determined.BRemen's Atmospheric PHOtochemical model (BRAPHO) was applied to compute the chemistry along a large number of trajectories.From these results,tropospheric column amounts of 03,NO2 and HCHO were derived.Tropospheric trace gas columns retrieved from GOME measurements and those calculated are in reasonable agreement.Their general spatial extent was similar in the lower troposphere but the modeled trace gas columns in the upper troposphere were located south of the retrieved columns.We attribute this behaviour to uncertainties in the ERA-40 meteorological data in the upper troposphere.The significance of biomass burning and of biogenic emissions with respect to HCHO columns over Africa was investigated.The analysis reveals that the total amounts of HCHO generated over Africa during September 1997 as a result of biomass burning and biogenic emissions are similar.However the HCHO from biogenic sources has the highest specific columns and these are located close to their source.In comparison the HCHO from biomass burning is predicted to be produced and transported over a much wider area.Overall all the emission processes mix together to produce the plume of O_3.
机译：通过GOME（全球臭氧监测实验）对反向散射辐射的测量，对痕量气柱的检索显示，在非洲大陆上，对流层臭氧（O_3），二氧化氮（NO_2）和甲醛（HCHO）的增强现象频繁发生。重点关注1997年9月非洲上空的微量气体行为，这一时期受到ENSO最强的厄尔尼诺现象的最强烈影响，调查了我们对所获取的对流层微量气柱密度的定性和定量理解.NO_x和挥发性有机物的排放研究了生物质燃烧，生物来源和闪电产生的化合物（VOC）及其光化学转化。通过轨迹分析，分析了不同排放区域的气团运移并确定了潜在的大气空间分布。BRemen的大气光化学模型（BRAPHO）被用于沿着大量的从这些结果得出了对流层03，NO2和HCHO的数量。从GOME测量获得的对流层示踪气柱与计算得出的值是合理一致的。对流层下部的总体空间范围相似，但模拟的示踪气柱对流层上部位于对流层以南。我们将此行为归因于对流层上部ERA-40气象数据的不确定性。调查了非洲HCHO柱对生物量燃烧和生物排放的重要性。分析表明，1997年9月非洲因生物量燃烧和生物排放而产生的HCHO总量相似，但生物源HCHO的比专栏最高，且位于其来源附近。预计生物质燃烧产生的污染物将在更广阔的区域生产和运输。排放过程混合在一起产生了O_3羽。

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