...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Trajectories of thermospheric air parcels flowing over Alaska, reconstructed fromground-based wind measurements
【24h】

Trajectories of thermospheric air parcels flowing over Alaska, reconstructed fromground-based wind measurements

机译：轨迹thermospheric空气包裹流动在阿拉斯加,重建fromground-based风测量

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

It is widely presumed that the convective stability and enormous kinematic viscosity of Earth's upper thermosphere hinders development of both horizontal and vertical wind shears and other gradients. Any strong local structure (over scale sizes of several hundreds of kilometers) that might somehow form would be expected to dissipate rapidly. Air flow in such an atmosphere should be relatively simple, and transport effects only slowly disperse and mix air masses. However, our observations show that wind fields in Earth's thermosphere have much more local-scale structure than usually predicated by current modeling techniques, at least at auroral latitudes; they complicate air parcel trajectories enormously, relative to typical expectations. For tracing air parcels, we used wind measurements of an all-sky Scanning Doppler Fabry-Perot interferometer and reconstructed time-resolved two-dimensional maps of the horizontal vector wind field to infer forward and backward air parcel trajectories over time. This is the first comprehensive study to visualize the complex motions of thermospheric air parcels carried through the actual observed local-scale structures in the high-latitude winds. Results show that thermospheric air parcel transport is a very difficult observational problem, because the trajectories followed are very sensitive to the detailed features of the driving wind field. To reconstruct the actual motion of a given air parcel requires wind measurements everywhere along the trajectory followed, with spatial resolutions of 100 km or less, and temporal resolutions of a few minutes or better. Understanding such transport is important, for example, in predicting the global-scale impacts of aurorally generated composition perturbations.
机译：人们普遍认为,对流稳定和巨大的运动粘度地球的上层热大气层阻碍了发展水平和垂直风剪其他的梯度。规模大小的几个数百公里)这可能会不知怎么的形式迅速消散。应该是相对简单的,和运输吗影响缓慢分散和混合的空气质量。然而,我们的观察表明,风能领域在地球的运转有更多局部范围比通常的结构当前的建模技术,至少在极光纬度;轨迹巨大,相对于典型的期望。风全天扫描测量多普勒法布里-珀罗干涉仪和重建时间分辨二维的地图水平风场矢量来推断和向前发展随着时间的推移向后空运轨迹。是第一个全面研究可视化复杂的运动thermospheric空气包裹通过实际观察到局部范围结构在高纬度地区的风。表明,thermospheric航空包裹运输非常困难的观测问题,因为轨迹跟踪非常敏感详细的驾驶风场的特点。重建一个给定的实际运动的空气包裹需要风力测量无处不在沿着轨迹之后,空间决议100公里或更少,和时间几分钟的决议或更好。理解这样的交通是很重要的,例子,在预测全球范围内的影响极光产生的组合扰动。

著录项

相似文献

  • 外文文献
  • 中文文献
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