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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >THE TERDIURNAL TIDE IN THE MESOSPHERE AND LOWER THERMOSPHERE OVER LONDON, CANADA (43-DEGREES-N, 81-DEGREES-W)
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THE TERDIURNAL TIDE IN THE MESOSPHERE AND LOWER THERMOSPHERE OVER LONDON, CANADA (43-DEGREES-N, 81-DEGREES-W)

机译：加拿大伦敦中上层和下层热层的地面潮汐（43度-N，81度-W）

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Radars have been used successfully for many years to measure atmospheric diurnal and semidiurnal tides, but studies of the atmospheric terdiurnal tide have only rarely been reported to date in the literature. In this paper we investigate the amplitude, phase, and vertical wavelength for the terdiurnal tide using the University of Western Ontario (UWO) 2 MHz radar near London, Canada. Emphasis is placed on short-term, monthly, seasonal, and annual variations of the terdiurnal tide. The results of the present study bring out certain new aspects of the terdiurnal tide at midlatitudes in the northern hemisphere. We show that terdiurnal tides have significant amplitudes in the mesosphere and lower thermosphere; indeed, the terdiurnal amplitudes are often comparable to the diurnal ones. We also draw attention to the annual variability and especially highlight the occurrence of the terdiurnal tide in nonwinter months. For example, the occurrence of the terdiurnal tide in spring months is not uncommon. Thus it seems that the 8-hour component observed over London, Canada, cannot be explained by the terdiurnal tide being due to solar heating alone. Particular cases of the terdiurnal tide are examined, and the observed amplitude and phase profiles of the terdiurnal tide at certain times of the year are discussed in terms of nonlinear interaction between the diurnal and semidiurnal tides. We suspect that this effect may also explain the fact that diurnal and semidiurnal tides at our station often seem suppressed relative to other sites [Thayaparan et al., 1995a]. On the basis of our previous and present observations it is also possible that large terdiurnal amplitudes observed at certain times of the year may be partly explained in terms of tidal/gravity wave interactions. However, this possibility needs to be further investigated in the future. [References: 30]
机译：雷达已经成功地用于测量大气日潮和半日潮，这已经有很多年了，但是迄今为止，文献中很少报道对大气日潮的研究。在本文中，我们使用加拿大伦敦附近的西安大略大学（UWO）2 MHz雷达调查了二潮时的振幅，相位和垂直波长。重点放在昼夜潮汐的短期，每月，季节性和年度变化上。本研究的结果揭示了北半球中纬度地区日变化潮的某些新方面。我们发现，在中层和较低的热圈中，二月潮汐具有明显的振幅;确实，昼夜振幅通常与昼夜振幅相当。我们还提请注意年度变化，并特别强调在非冬季月份发生的三月潮。例如，春季月份发生潮汐潮并不少见。因此，似乎无法从加拿大伦敦上空观测到的8小时分量解释为仅由于太阳加热而引起的日潮。检查了日潮的特殊情况，并根据日潮和半日潮之间的非线性相互作用，讨论了在一年中某些时间观测到的潮汐振幅和相位分布。我们怀疑这种影响还可能解释了这样一个事实，即相对于其他地点，我们站的日潮和半日潮似乎常常受到抑制[Thayaparan等，1995a]。根据我们之前和现在的观察结果，也有可能在潮汐/重力波相互作用方面部分解释了一年中某些时候观测到的大的二日振幅。但是，这种可能性将来需要进一步研究。 [参考：30]

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