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首页> 外文学位 >A study on dimethyl sulfide in a coastal upwelling region, formaldehyde in a coniferous forest, and estimating boundary layer height over a mountainous terrain.
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A study on dimethyl sulfide in a coastal upwelling region, formaldehyde in a coniferous forest, and estimating boundary layer height over a mountainous terrain.

机译：对沿海上升流区域的二甲基硫醚，针叶林中的甲醛进行了研究，并估算了山区地形的边界层高度。

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摘要

This study investigates the effects of biosphere as sources on two atmospheric trace gases: dimethyl sulfide (DMS) and formaldehyde (HCHO) are predominant primary and secondary trace gases in oceanic and forested environments, respectively. DMS is mainly emitted from the ocean surface by phytoplankton, and significantly contributes to global sulfur budget and sulfate aerosol formation. In this study, DMS was measured in upwelling northwestern coast of California during the summer of 2005. A newly developed parameterization, which is a combination of upwelling strength, marine boundary layer height, and wind speed, successfully reproduced observed atmospheric DMS. In addition, based on a budget equation, DMS flux from an upwelling coastal region was estimated.;HCHO was measured in a coniferous forest during the BEARPEX (Biosphere Effects on Aerosols and Photochemistry Experiment) field intensive in 2007. Various biogenic volatile organic compounds (BVOCs) were investigated as HCHO precursors (17 BVOCs for OH-initiated oxidation, 13 BVOCs for ozonolysis, and 6 species for a peroxyacetyl radical production) to explain the observed HCHO concentrations by quantifying the known production and loss terms in a HCHO budget equation. The results support the vigorous intra-canopy chemistry of reactive BVOCs and also show the importance of transported precursors along with the Sacramento plume.;Finally, atmospheric boundary layer (ABL) heights were estimated using a spectral analysis of horizontal winds over a mountainous terrain during the BEARPEX campaigns. Horizontal winds were obtained from the tower measurements with a 10Hz sonic anemometer. Estimated ABL heights showed good agreements with observations in unstable environments, whereas nocturnal wind spectra seemed to be influenced by dynamics other than turbulence. Nonetheless, a diagnostic equation suggested by previous studies is likely to explain the variations in stable nocturnal boundary layer heights.
机译：这项研究调查了生物圈作为源对两种大气痕量气体的影响：二甲基硫醚（DMS）和甲醛（HCHO）分别是海洋和森林环境中的主要初级和次级痕量气体。 DMS主要是通过浮游植物从海洋表面排放的，并且对全球硫预算和硫酸盐气溶胶的形成做出了重要贡献。在这项研究中，DMS是在2005年夏季在加利福尼亚州西北海岸的上升流中测量的。新开发的参数化是上升流强度，海洋边界层高度和风速的组合，成功地再现了观测到的大气DMS。此外，根据预算方程，估算了来自沿海上升地区的DMS通量。；在2007年密集进行BEARPEX（生物圈对气溶胶和光化学实验的影响）田间的针叶林中测量了HCHO。各种生物成因挥发性有机化合物（研究了BVOCs作为HCHO的前体（用于OH引发氧化的17种BVOC，用于臭氧分解的13种BVOC和用于过氧乙酰基产生的6种物质），通过量化HCHO预算方程中的已知产生和损失项来解释观察到的HCHO浓度。结果支持了反应性BVOC的蓬勃发展，并显示了运输的前体和萨克拉曼多羽流的重要性。最后，通过对山地地形在水平方向上的风向进行光谱分析，估算了大气边界层（ABL）的高度BEARPEX广告系列。使用10Hz声波风速计从塔的测量中获得水平风。估计的ABL高度与不稳定环境中的观测值显示出良好的一致性，而夜间风谱似乎受湍流以外的动力学影响。尽管如此，以前的研究提出的诊断方程很可能可以解释夜间夜间稳定边界层高度的变化。

著录项

  • 作者

    Choi, Won Sik.;

  • 作者单位

    University of California, Davis.;

  • 授予单位 University of California, Davis.;
  • 学科 Atmospheric Sciences.
  • 学位 Ph.D.
  • 年度 2010
  • 页码 222 p.
  • 总页数 222
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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