...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Meteorological factors associated with inhomogeneous ozone concentrations within the Mexico City basin
【24h】

Meteorological factors associated with inhomogeneous ozone concentrations within the Mexico City basin

机译：墨西哥城盆地内与非均匀臭氧浓度相关的气象因素

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

Meteorological processes associated with inhomogeneous ozone concentrations over Mexico City are examined by using observations from a recent field campaign and a mesoscale dynamics and dispersion modeling system. During this 4-week field campaign, meteorological measurements of the spatial flow structure within the Mexico City basin were obtained for the first time. A mesoscale model that employs four-dimensional data assimilation is used to create analyses that describe the boundary layer characteristics and local and regional circulations in the vicinity of Mexico City. The mesoscale analyses are then used to drive a Lagrangian particle dispersion model to simulate pollutant transport and diffusion. The resemblance between the calculated particle concentration fields and the observed spatial ozone patterns indicates that the mesoscale analyses, based on the model and the observed profiles of wind, temperature, and humidity, captured the main flow features responsible for the inhomogeneous ozone concentrations within the basin. The highest particle concentrations usually occurred in the vicinity of the peak ozone concentrations during the afternoon. The observations and mesoscale analyses provided evidence that the circulations are highly complex, and relatively weak upper level synoptic systems had an impact on the local and regional thermally driven flows in the area. Ln addition to horizontal advection and vertical diffusion, vertical wind shears, recirculation patterns associated with venting and entrainment processes, and mean vertical motions due to convergence within the basin also played an important role in producing the spatial variations in the near-surface particle distributions. The contribution of emissions from the previous day was found to be relatively minor for the periods examined in this study, even though the nocturnal wind speeds were light, suggesting that the high ozone concentrations are not due to multiday accumulation of pollutants. [References: 41]
机译：通过使用最近一次野外活动的观测结果以及中尺度的动力学和色散建模系统，研究了与墨西哥城上空的臭氧浓度不均匀相关的气象过程。在为期4周的野战期间，首次获得了墨西哥城盆地内空间流结构的气象测量结果。使用四维数据同化的中尺度模型用于创建描述边界层特征以及墨西哥城附近局部和区域环流的分析。然后，中尺度分析被用于驱动拉格朗日粒子扩散模型，以模拟污染物的迁移和扩散。计算出的颗粒物浓度场与观测到的空间臭氧模式之间的相似性表明，基于模型和观测到的风，温度和湿度剖面的中尺度分析捕获了造成盆地内臭氧浓度不均匀的主要流量特征。 。最高的颗粒浓度通常发生在下午的臭氧峰值浓度附近。观测和中尺度分析提供了证据，证明了环流高度复杂，相对较弱的高层天气系统对该地区的局部和区域热驱动流动产生了影响。除了水平对流和垂直扩散外，垂直风切变，与通气和夹带过程有关的再循环模式，以及盆地内收敛引起的平均垂直运动，在产生近地表颗粒分布的空间变化方面也起着重要作用。即使在夜间风速较轻的情况下，在本研究中发现，前一天的排放贡献相对较小，这表明高臭氧浓度不是由于污染物的多日累积所致。 [参考：41]

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