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To what extent do molecular collisions arising from water vapour efflux impede stomatal O_3 influx?

机译：水蒸气外流引起的分子碰撞在多大程度上阻止了气孔O_3的涌入？

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摘要

Pre-requisite for reliable O_3 risk assessment for plants is determination of stomatal O_3 uptake. One unaddressed uncertainty in this context relates to transpiration-induced molecular collisions impeding stomatal O_3 influx. This study quantifies, through physical modelling, the error made when estimating stomatal O_3 flux without accounting for molecular collisions arising from transpiratory mass flow of gas out of the leaf. The analysis demonstrates that the error increases with increasing leaf-to-air water vapour mole fraction difference (Aw), being zero in water vapour saturated air and 4.2% overestimation at Aw of 0.05. Overestimation is approximately twice as large in empirical studies quantifying stomatal O_3 flux from measured leaf or canopy water flux, if neglecting both water vapour-dry air collisions (causing overestimation of leaf conductance) and collisions involving O_3. Correction for transpiration induced molecular collisions is thus relevant for both empirical research and for large-scale modelling of stomatal O_3 flux across strong spatial Aw gradients.
机译：对植物进行可靠的O_3风险评估的前提是确定气孔O_3的摄入量。在这种情况下，一个未解决的不确定性与蒸腾诱导的分子碰撞有关，阻碍了气孔O_3的涌入。这项研究通过物理模型量化了估算气孔O_3通量时所产生的误差，而没有考虑到气体从叶片中蒸腾出来的质量流量所引起的分子碰撞。分析表明，该误差随叶对空气中水蒸气摩尔分数差（Aw）的增加而增加，在水蒸气饱和空气中为零，Aw为0.05时高估了4.2％。如果忽略水蒸气-干空气的碰撞（导致对叶片电导的高估）和涉及O_3的碰撞，量化从测得的叶片或冠层水通量产生的气孔O_3通量的经验研究中，高估大约是两倍。因此，对蒸腾作用引起的分子碰撞的校正与实证研究以及跨越强空间Aw梯度的气孔O_3通量的大规模建模都相关。

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  • 来源
    《Environmental Pollution》 |2012年第11期|p.39-42|共4页
  • 作者

    Johan Uddling; Rainer Matyssek; Jan B.C. Pettersson; Gerhard Wieser;

  • 作者单位

    Department of Biological and Environmental Sciences, University of Gothenburg, P. 0. Box 461, SE-405 30 Goeteborg, Sweden;

    Ecophysiology of Plants, Technische Universitat Miinchen, von-Carlowitz Platz 2, D-85354 Freising-Weihenstephan, Germany;

    Department of Chemistry and Molecular Biology, Atmospheric Science, University of Gothenburg, SE-412 96 Goeteborg, Sweden;

    Department of Alpine Timberline Ecophysiology, Federal Office and Research Centre for Forests, Rennweg 1, A-6020 Innsbruck, Austria;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    ozone; arbon dioxide water vapour molecular collisions stomata;

    机译：臭氧;二氧化碳水蒸气分子碰撞气孔;

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