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Quantitative analysis of interaction between the free troposphere and planetary boundary layer using multiple measurements and large eddy simulation model.

机译：使用多次测量和大型涡模拟模型对自由对流层与行星边界层之间相互作用的定量分析。

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摘要

We investigate the interaction between the free troposphere (FT) and planetary boundary layer (PBL) using multiple measurements and Dutch Atmospheric Large Eddy Simulation (DALES) coupled with a chemical module.;A residual layer (RL) storing high ozone concentrations can significantly influence ground ozone concentration through the entrainment process whereby the RL aloft is incorporated into the growing convective boundary layer (CBL) during the morning transition. We use DALES model coupled with a chemical module to simultaneously study the dynamical and chemical impacts of a RL (200-1200 m above ground level (AGL)) on ground-level (0-200 m AGL) ozone concentrations. Four numerical experiments test these interactions: 1) a RL with high ozone (100 ppb); 2) a RL with low ozone (50 ppb); 3) no RL with high ozone above the NBL (100 ppb from 200-1200 m AGL); and 4) no RL with low ozone above the NBL (50 ppb). The results indicate that ozone stored in the RL can contribute up to 86% of the ozone concentration in the CBL during the following day in Case 1. Even in Case 2, 64% of the ozone in the developed CBL results from intrusions from the RL. Additionally, a RL also increases the enhancement rate of ozone in the CBL.;Furthermore, we investigate the ozone diurnal variation on September 6, 2013 in Huntsville AL. The ozone variation in the CBL is mainly caused by local emissions due to the weather conditions being controlled by an anticyclonic system. The local chemical production contributes over 67% of the ozone enhancement in the CBL. The dynamical processes contribute the rest. The numerical experiments show good agreement with our ozone lidar observations. However, our simulation results and ozone lidar observations fail to reproduce a declining trend of surface ozone measured by an Environment Protection Agency (EPA) surface monitoring station that is 6 km south of our facilities, which is very likely due to the large ozone horizontal variation and the diurnal variation of ozone dry deposition under urban environment.
机译：我们使用多次测量和结合化学模块的荷兰大气大涡模拟（DALES），研究了自由对流层（FT）和行星边界层（PBL）之间的相互作用。;存储高臭氧浓度的残留层（RL）可以显着影响通过夹带过程使地面臭氧浓度升高，从而在早晨过渡期间将RL高空引流纳入到不断增长的对流边界层（CBL）中。我们将DALES模型与化学模块结合使用，以同时研究RL（高于地面200-1200 m（AGL））对地面（0-200 m AGL）臭氧浓度的动力学和化学影响。四个数值实验测试了这些相互作用：1）具有高臭氧浓度（100 ppb）的RL； 2）低臭氧（50 ppb）的RL； 3）没有高于NBL（200-1200 m AGL为100 ppb）的高臭氧含量的RL； 4）没有高于NBL（50 ppb）的低臭氧的RL。结果表明，在案例1中，RL中储存的臭氧可在第二天中贡献高达CBL中臭氧浓度的86％。即使在案例2中，已开发的CBL中64％的臭氧也来自RL的入侵。 。此外，RL还提高了CBL中臭氧的增强率。此外，我们于2013年9月6日在AL的Huntsville调查了臭氧的日变化。 CBL中的臭氧变化主要是由于天气条件受反气旋系统控制而导致的局部排放所致。在CBL中，当地的化学生产贡献了超过67％的臭氧增强作用。动态过程贡献了其余部分。数值实验表明与我们的臭氧激光雷达观测结果吻合良好。但是，我们的模拟结果和臭氧激光雷达观测结果无法再现由位于我们设施以南6公里处的环境保护局（EPA）地面监测站测量到的地面臭氧的下降趋势，这很可能是由于臭氧水平变化较大所致城市环境下臭氧干沉降的日变化

著录项

  • 作者

    Huang, Guanyu.;

  • 作者单位

    The University of Alabama in Huntsville.;

  • 授予单位 The University of Alabama in Huntsville.;
  • 学科 Atmospheric Sciences.;Environmental Sciences.;Atmospheric Chemistry.
  • 学位 Ph.D.
  • 年度 2015
  • 页码 104 p.
  • 总页数 104
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 TS97-4;
  • 关键词

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