...
  • 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 >SEASONAL VARIABILITY OF THE DIURNAL TIDE - RESULTS FROM THE CANADIAN MIDDLE ATMOSPHERE GENERAL CIRCULATION MODEL
【24h】

SEASONAL VARIABILITY OF THE DIURNAL TIDE - RESULTS FROM THE CANADIAN MIDDLE ATMOSPHERE GENERAL CIRCULATION MODEL

机译：日潮的季节变化-来自加拿大中大气总环流模型的结果。

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

The seasonal variability of the migrating diurnal tide is studied using a general circulation model (GCM) that extends from the Earth's surface to 97 km. Results from a 2-year simulation reveal a strong semiannual variation in the amplitude df the tide at low latitudes in the mesosphere, in agreement with recent observations from the upper atmosphere research satellite. The northward wind and temperature attain maximum amplitudes at equinox of approximately 60 mis and 20 degrees K, respectively, and minima at solstice that are a factor of 2 dr more weaker. The reasons for this seasonal variation are explored by diagnosing the migrating diurnal tide solar and deep convective heating in the GCM and by implementing that heating in a linear mechanistic model. The agreement between the two models is quite good in April, but much less so in July when the diurnal tide simulated by the GCM has a much weaker amplitude and longer vertical wavelength in the mesosphere. It is concluded that seasonal variations in the thermal heating in the troposphere and stratosphere cannot account for the seasonal variations in the amplitude of the tidal winds and temperatures in the mesosphere. Although the exact cause of the semiannual amplitude variation has not yet been identified, nonlinear effects are most likely important since a very close correspondence is found between the Eliassen-Palm flux divergence and the tidal amplitudes, with the times and locations of the strongest divergence coinciding with the weakest tidal wind amplitudes. [References: 47]
机译：使用从地球表面延伸到97 km的一般环流模型（GCM）研究了昼夜迁徙潮的季节性变化。一项为期两年的模拟结果表明，与中高层大气研究卫星最近的观测结果一致，在中层低纬度地区，潮汐的振幅半年度变化很大。朝北的风和温度在等分点处分别达到最大振幅，分别约为60 ms和20 K，而在冬至时的最小值则弱了2 dr。通过诊断GCM中日移潮的太阳潮和深对流加热并在线性力学模型中实施该加热，探索了这种季节性变化的原因。两种模式之间的协议在4月相当不错，但在7月则更是如此，当时GCM模拟的日潮在中层具有更弱的振幅和更长的垂直波长。结论是，对流层和平流层热力的季节变化不能解释潮汐振幅和中层温度的季节变化。尽管尚未确定半年度振幅变化的确切原因，但非线性影响最重要，因为在Eliassen-Palm通量散度和潮汐振幅之间发现了非常紧密的对应关系，同时最大散度的时间和位置重合潮气振幅最弱。 [参考：47]

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