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Influence of local air flow regimes on the ozone content of two Pyrenean valleys

机译：当地空气流动方式对两个比利牛斯山谷的臭氧含量的影响

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摘要

The Pyrenees Mountains, the natural border between France and Spain, have experienced a large increase in road traffic in the last decade. Due to this fact, a research program named PAP (Pollution Atmospheric in the Pyrenees) was established in 2004 by several laboratories from Spain and France to address the influence of meteorological regimes on the pollution levels of two adjacent valleys, Aspe valley (France) and Canfranc valley (Spain), situated in the center of the Pyrenean range. Pollution measurements show that mean ozone concentrations increase with height. In Sarrance, the site placed at the bottom of the valleys at 335 m above sea level (ASL), the mean ozone value was 23 ppb, whereas at the Pic Midi observatory (2877 m ASL), the top of the PAP network, the value found for mean ozone values was 52 ppb. A linear trend fits this altitudinal variation with a vertical gradient of 17 ppb km~(-1). The data demonstrate that the observatories located over 1400 m ASL do not show the classical mean daily ozone cycle, and that mean ozone concentrations throughout the day are nearly constant. By contrast, below 1400 m ASL the classical mean daily ozone cycle is clear, reaching a maximum around noon. These findings indicate that the photochemical reactions are almost inactive at the elevated observatories and, as a result, it can be concluded that ozone levels at those locations are mostly caused by advection of aged air masses. Consequently, we could find that the gradient inside the valleys follows a linear trend of 29 ppb km~(-1). Finally, it has been observed that in north Foehn situations, intrusions of polluted air coming from the Free Troposphere (FT) can be detected in the upper part of the Spanish valley of Canfranc, where the mean daily ozone cycle changes significantly and becomes similar to the ones measured at the stations situated above 1400 m ASL However, the results also pointed out that, except for the Foehn situations, the different local air flow regimes do not strongly affect the mean diurnal cycle of ozone and the mean ozone concentrations.
机译：比利牛斯山脉是法国和西班牙之间的天然边界，在过去十年中，道路交通量大幅增加。由于这个事实，西班牙和法国的几个实验室于2004年制定了一项名为PAP（比利牛斯山脉的大气污染）的研究计划，以解决气象制度对两个相邻山谷（法国Aspe山谷和法国）的污染水平的影响。坎弗兰克山谷（西班牙），位于比利牛斯山脉的中心。污染测量表明，平均臭氧浓度随高度增加。在Sarrance，该地点位于海拔335 m的谷底，平均臭氧值为23 ppb，而在Pic Midi天文台（2877 m ASL）是PAP网络的顶部，臭氧平均含量的值为52 ppb。线性趋势与垂直梯度为17 ppb km〜（-1）的高度变化拟合。数据表明，位于ASL 1400 m以上的天文台没有显示经典的平均每日臭氧循环，并且一天中的平均臭氧浓度几乎恒定。相比之下，在1400 m ASL以下，经典的平均每日臭氧循环是清晰的，在中午左右达到最大值。这些发现表明，高架天文台的光化学反应几乎没有活性，因此，可以得出结论，这些地点的臭氧水平主要是由老化的空气对流引起的。因此，我们发现谷底内的梯度遵循29 ppb km〜（-1）的线性趋势。最后，据观察，在北福恩的情况下，可以在西班牙坎弗兰克山谷的上部发现来自自由对流层（FT）的污染空气入侵，那里的平均每日臭氧循环发生显着变化，并与在高于1400 m ASL的站点上进行测量的结果。但是，结果还指出，除了Foehn情况以外，不同的局部空气流动方式不会对臭氧的平均日循环和平均臭氧浓度产生强烈影响。

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  • 来源
    《Atmospheric environment》 |2013年第8期|367-377|共11页
  • 作者

    A. Ezcurra; B. Benech; A. Echelecou; J.M. Santamaria; I. Herrero; E. Zulueta;

  • 作者单位

    Dpto. Fisica Aplicada Ⅱ, Universidad del Pais Vasco UPV-EHU, Spain;

    CRA Lannemezan, Universite de Toulouse, France;

    Dpto. Geographie, Universite de Pau, France;

    Dpto. Quimica y Edafologia, Universidad de Navarra, Spain;

    Dpto. Expresion Crafica y Proyectos, Universidad del Pals Vasco UPV-EHU, Bilbao, Spain;

    Dpto. Ingenieria y Automatization de Sistemas, Universidad del Pais Vasco UPV-EHU, Spain;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Ozone; Mountain pollution; Mountain meteorology; Pyrenees;

    机译：臭氧;山地污染;山区气象;比利牛斯山脉;

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