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Time lag between the tropopause height and ~7Be activity concentrations on surface air

机译：对流层顶高度与地面空气〜7Be活性浓度之间的时间差

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摘要

A strong positive correlation between the seasonal changes of the tropopause height and the concentration of ~7Be in the surface air (R = 0.94, p ＜ 0.0001) was observed at 40°N. Moreover, a strong positive correlation was revealed between the activity concentrations of ~7Be and the temperature T(℃) (R = 0.97, p ＜ 0.001), confirming that the increased rate of vertical transport within the troposphere, especially during warmer months, has as a result the descent to the surface of air masses enriched in ~7Be. The results of the present work suggest that the temperature and the tropopause height are good indicators for transport time of air masses enriched in ~7Be to the surface. Higher values of temperature or tropopause height seem to result to shorter transport times. This is attributed to atmospheric convection which provides an effective mechanism for vertical transport of air masses. Increasing tropospheric temperature has generally as a result that convection penetrates more deeply which in turn leads to an increase in tropopause height. But, the atmospheric procedures do not occur immediately after the fluctuations of correlated factors. Thus, a time lag is expected between the tropopause height and ~7Be activity concentrations on surface air that might be from hours to days or weeks. The result suggests that ~7Be concentrations fully respond within three days after the changes in the tropopause height.
机译：在40°N观测到对流层顶高度的季节变化与地表空气中〜7Be的浓度之间存在强正相关（R = 0.94，p ＜0.0001）。此外，在〜7Be的活动浓度与温度T（℃）之间显示出强烈的正相关关系（R = 0.97，p ＜0.001），这证实了对流层内垂直运输速率的增加，特别是在较温暖的月份结果下降到富含〜7Be的气团表面。目前的工作结果表明，温度和对流层顶高度是〜7Be富集的气团向地面传输时间的良好指标。较高的温度值或对流层顶高度似乎会缩短运输时间。这归因于大气对流，它提供了有效的气团垂直输送机制。对流层温度升高通常导致对流穿透更深，进而导致对流层顶高度增加。但是，大气过程不会在相关因素波动之后立即发生。因此，预计对流层顶高度与地表空气中〜7Be活性浓度之间可能会有数小时至数天或数周的时间延迟。结果表明，对流层顶高度变化后三天内〜7Be浓度完全反应。

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  • 来源
    《Journal of Environmental Radioactivity》 |2014年第3期|80-85|共6页
  • 作者

    A. Ioannidou; A. Vasileiadis; D. Melas;

  • 作者单位

    Aristotle University of Thessaloniki, Physics Department, Nuclear Physics Laboratory, Thessaloniki 54124, Greece;

    Aristotle University of Thessaloniki, Physics Department, Nuclear Physics Laboratory, Thessaloniki 54124, Greece;

    Aristotle University of Thessaloniki, Physics Department, Laboratory of Atmospheric Physics, Thessaloniki 54124, Greece;

  • 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

    Radionuclide tracer; Tropopause height; Transport time; Mid latitudes;

    机译：放射性核素示踪剂;对流线高度运输时间;中纬度;

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