A new perspective on the longitudinal variability of the semidiurnal tide
A new perspective on the longitudinal variability of the semidiurnal tide
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半日潮纵向变化的新视角
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
M. Jarvis
中科院分区：
文献类型：
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作者：
R. Hibbins;O. Marsh;A. McDonald;M. Jarvis
本文通过比较两部位于南极相对两侧的雷达观测资料，研究了南极中层上层半日潮的经向变化。在假设潮汐仅由S = 2（迁移）和S = 1（向西传播，非迁移）分量组成的情况下，分量的相对相位随季节而变化，使得波浪通常在0°E（180°E）附近的冬季（夏季）月份处于相长干涉。我们表明，这对78°S附近的半日潮的季节性行为有深远的影响，这取决于经度，并且在这个纬度上没有单站观测可以被认为是代表“纬向平均值”。这两个波的叠加被用来解释以前发表的潮汐地面气候的差异。
The longitudinal variability of the semidiurnal tide in the Antarctic upper mesosphere is investigated by comparison of observations from two radars at approximately opposite sides of Antarctica. Under the assumption that the tide is composed of an S = 2 (migrating) and S = 1 (westward‐propagating, non‐migrating) component only, the relative phases of the components are shown to vary with season such that the waves are typically in constructive interference during the winter (summer) months at longitudes around 0°E (180°E). We show that this has profound effects on the seasonal behaviour of the semidiurnal tide around 78°S dependent on the longitude, and that no single‐station observations at this latitude can be considered representative of a “zonal mean”. The superposition of these two waves is used to interpret differences in previously‐published ground‐based climatologies of the tide.