Observations of a nonmigrating component of the semidiurnal tide over Antarctica
Observations of a nonmigrating component of the semidiurnal tide over Antarctica
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DOI：
10.1029/2002jd003077
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发表时间：
2003-04
影响因子：
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通讯作者：
D. Murphy;M. Tsutsumi;D. Riggin;G. Jones;R. Vincent;M. Hagan;S. Avery
中科院分区：
文献类型：
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作者：
D. Murphy;M. Tsutsumi;D. Riggin;G. Jones;R. Vincent;M. Hagan;S. Avery
[1]位于戴维斯，Syowa和Rothera在南极洲的中频雷达获得的数据被用来检测在中层和低热层的半日潮的nonmigrating组件。这些雷达处于相似的纬度，因此共享共同的迁移潮汐分量。通过将半日潮矢量拟合到每个站的数据，并对每对站进行这些矢量的减法，可以去除迁移分量，并揭示非迁移分量之间的差异。夏季月份（12月至3月）的非零差异表明存在大量非移徙部分。在其他网站的建模研究和观测表明，这是最有可能的向西传播波数1 nonmigrating组件，有助于半日潮。这里提供的数据被发现与这一假设是一致的。这nonmigrating组件的气候介绍和讨论。与全球尺度波模式的比较表明，潜热释放是不是一个显着的强迫机制，在这些高度和纬度。
[1] Data obtained from the MF radars situated at Davis, Syowa and Rothera in Antarctica are used to detect a nonmigrating component of the semidiurnal tide in the mesosphere and lower thermosphere. These radars are at similar latitudes and so share a common migrating tidal component. By fitting semidiurnal tide vectors to each stations data and performing subtractions of these vectors for pairs of stations, the migrating component can be removed and the difference between the nonmigrating components revealed. Non-zero differences in the summer months (December to March) indicate the presence of a significant nonmigrating component. Modeling studies and observations at other sites suggest that it is most likely the westward propagating wavenumber 1 nonmigrating component that is contributing to the semidiurnal tide. The data presented here are found to be consistent with this hypothesis. A climatology of this nonmigrating component is presented and discussed. Comparisons with the Global Scale Wave Model suggest that latent heat release is not a significant forcing mechanism at these heights and latitudes.