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首页> 外文学位 >Measurements of Atmospheric Ozone, Nitrite, OClO, and Bromium Oxide at 80 degrees N using UV-Visible Spectroscopy.
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Measurements of Atmospheric Ozone, Nitrite, OClO, and Bromium Oxide at 80 degrees N using UV-Visible Spectroscopy.

机译：使用紫外可见光谱法在80度N下测量大气臭氧，亚硝酸盐，OClO和氧化溴。

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摘要

The motivation for this thesis was to study chemical and dynamical processes in the Arctic stratosphere, using data from two ground-based spectrometers (GBSs). The GBSs took atmospheric trace gas measurements at the Polar Environment Atmospheric Research Laboratory (PEARL), which is located at Eureka, Nunavut, Canada (80.05°N, 86.42°W) and operated by the Canadian Network for the Detection of Atmospheric Change. The University of Toronto GBS took measurements at Eureka on a campaign basis from 1999-2011. The PEARL-GBS was installed permanently at Eureka in 2006 and has taken measurements during the sunlit part of the year since then.;GBS and other ground-based ozone and NO2 column measurements were compared with Atmospheric Chemistry Experiment (ACE) and Optical Spectrograph and Infra-Red Imaging System (OSIRIS) satellite measurements above Eureka. Ozone from all instruments agreed within 9.2%, while NO2 from most instruments, including the GBS, agreed to within 20%.;On 1 August 2008, a solar eclipse of 98% totality passed over Eureka. GBS NO2 increased to 1.84+0.12-0.43 times normal levels. This agrees with a ratio of 1.91 that was calculated using a photochemical model, adjusted for reduced sunlight during the eclipse.;In spring/winter 2011, up to 47% (250 DU) ozone loss was calculated using GBS data and modeled passive ozone. This was the largest ozone loss in the 11-year GBS measurement record. GBS OClO was elevated, indicating chlorine activation and NO2 was low, suggesting denitrification. GBS, satellite, and chemical transport model data were used to investigate the 2011 vortex breakup. NOx transport led to middle-stratosphere ozone loss within an anticyclone. Furthermore, isolated, or "frozen-in", vortex and lower-latitude airmasses were observed following the vortex breakup.;Stratospheric BrO was retrieved from spring 2008 GBS zenith-sky measurements, using an optimal estimation technique. GBS BrO was compared with OSIRIS and Ozone Monitoring Instrument (OMI) satellite data. Discrepancies are partly attributed to bromine explosions in the boundary layer. New off-axis GBS measurements taken in spring 2010 are sensitive to boundary layer bromine. The combination of GBS stratospheric and tropospheric BrO measurements will be useful for future estimates of the Arctic bromine budget.
机译：本论文的目的是利用来自两个地面光谱仪（GBS）的数据研究北极平流层中的化学和动力学过程。 GBS在位于加拿大努纳武特（40.05°N，86.42°W）的极地环境大气研究实验室（PEARL）进行了大气痕量气体测量，并由加拿大大气变化探测网络负责。多伦多大学GBS于1999-2011年在运动中对尤里卡进行了测量。 PEARL-GBS于2006年在尤里卡（Eureka）永久安装，此后在一年中的日照期间进行了测量。GBS和其他地面臭氧和NO2柱的测量结果与大气化学实验（ACE）和光学光谱仪进行了比较，尤里卡上方的红外成像系统（OSIRIS）卫星测量值。所有仪器中的臭氧含量在9.2％的范围内，而包括GBS在内的大多数仪器中的NO2含量在20％的范围内。2008年8月1日，尤里卡上空发生了总计98％的日食。 GBS NO2增加到正常水平的1.84 + 0.12-0.43倍。这与使用光化学模型计算的比率1.91一致，并针对日食期间的日照减少进行了调整。; 2011年春/冬，使用GBS数据和模拟的被动臭氧计算得出的臭氧损失高达47％（250 DU）。这是11年GBS测量记录中最大的臭氧损失。 GBS OClO升高，表明氯活化，NO2含量低，表明反硝化作用。 GBS，卫星和化学物质传输模型数据用于调查2011年的涡旋破裂。 NOx的运输导致反旋风分离器中平流层臭氧的损失。此外，在涡旋破裂后，观察到了孤立的或“冻结”的涡旋和低纬度气团。；采用最佳估算技术，从2008年春季的GBS天顶天空测量中获得了平流层BrO。 GBS BrO与OSIRIS和臭氧监测仪（OMI）卫星数据进行了比较。差异部分归因于边界层中的溴爆炸。 2010年春季进行的新的离轴GBS测量对边界层溴敏感。 GBS平流层和对流层BrO测量值的结合将对北极溴预算的未来估算有用。

著录项

  • 作者

    Adams, Cristen Luna Frith.;

  • 作者单位

    University of Toronto (Canada).;

  • 授予单位 University of Toronto (Canada).;
  • 学科 Atmospheric Chemistry.
  • 学位 Ph.D.
  • 年度 2012
  • 页码 322 p.
  • 总页数 322
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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