• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >Investigation of ozone concentrations in the tropical Atlantic marine boundary layer during Saharan dust and biomass burning events.
【24h】

Investigation of ozone concentrations in the tropical Atlantic marine boundary layer during Saharan dust and biomass burning events.

机译：调查撒哈拉尘埃和生物质燃烧事件期间热带大西洋海洋边界层中的臭氧浓度。

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

The trans-Atlantic Aerosol and Ocean Science Expedition experiments were conducted to investigate the chemical and microphysical evolution of the Saharan air layer (SAL) during its long range transport into the eastern seaboard of the United States and the Caribbean, and to quantify the effects of the SAL on the regional environment and climate. Analyses of air mass history, satellite imagery, surface weather maps, and chemical and aerosol datasets allowed the characterization of four distinct meteorological regimes: marine background, dust, mixed dust and biomass burning, and biomass burning air mass regimes. During the AEROSE experiments, continuous in-situ measurements of ozone were collected during both Saharan dust and biomass burning events. Along the AEROSE-I ship track, the ship encountered air masses with significant Saharan dust loading early in the cruise, and mixed dust and biomass burning aerosols later along the cruise track. While traveling through the dominant dust regime, ozone concentrations were reduced by up to 70%. Photochemistry was not dominant within the dust regime and the reduced ozone concentrations are most likely due to dry deposition or removal by nitric oxide (NO). During the mixed dust and biomass burning regimes, smoke was observed to dominate the chemistry of the air masses. During AEROSE-II, ozone concentrations exceeding 150 ppb were observed over 4,800 km downstream of a biomass burning source region. Back trajectory analyses, satellite imagery, and streamline analyses confirmed that the ship was traveling through air masses influenced by biomass burning. Elevated ozone concentrations aloft were also apparent from observations of ozonesondes that were launched during the biomass burning regime.
机译：进行了跨大西洋气溶胶和海洋科学考察实验，以研究撒哈拉空气层（SAL）远距离运输到美国和加勒比海东部海岸期间的化学和微物理演变，并量化SAL有关区域环境和气候的信息。通过对空气质量历史，卫星图像，地表天气图以及化学和气溶胶数据集进行分析，可以表征四种不同的气象状况：海洋背景，尘埃，混合尘埃和生物质燃烧以及生物质燃烧空气质量状况。在AEROSE实验期间，在撒哈拉尘埃和生物质燃烧过程中都连续进行了臭氧的现场测量。沿AEROSE-I船航迹，该船在巡航初期遇到大量撒哈拉尘埃负荷很大的空气团，随后在巡航航道上遇到了混合尘埃和燃烧生物质的气溶胶。通过主要的粉尘状态时，臭氧浓度最多降低了70％。光化学在粉尘范围内并不占主导地位，降低的臭氧浓度很可能是由于干沉积或被一氧化氮（NO）去除所致。在粉尘和生物质的混合燃烧过程中，观察到烟雾占主导地位的空气质量。在AEROSE-II期间，在生物质燃烧源区域下游4,800 km处观察到臭氧浓度超过150 ppb。背向轨迹分析，卫星图像和流线分析证实，该船正在穿越受生物质燃烧影响的空气团。从在生物质燃烧过程中发射的臭氧探空仪的观测结果也可以明显看出，臭氧浓度升高了。

著录项

  • 作者

    Hawkins, Michelle Denise.;

  • 作者单位

    Howard University.;

  • 授予单位 Howard University.;
  • 学科 Atmospheric Sciences.; Environmental Sciences.
  • 学位 Ph.D.
  • 年度 2007
  • 页码 103 p.
  • 总页数 103
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境科学基础理论;
  • 关键词

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