Atmospheric tides in the low‐latitude E and F regions and their responses to a sudden stratospheric warming event in January 2010
Atmospheric tides in the low‐latitude E and F regions and their responses to a sudden stratospheric warming event in January 2010
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DOI：
10.1002/2013ja019248
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发表时间：
2013-12
期刊：
影响因子：
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通讯作者：
Yun Gong;Qihou H. Zhou;Shaodong Zhang
中科院分区：
文献类型：
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作者：
Yun Gong;Qihou H. Zhou;Shaodong Zhang
对低纬热层大气潮汐及其对重大平流层突然变暖（SSW）事件（2010年1月18-23日）的响应进行了广泛的分析。该分析基于阿雷西博双波束非相干散射雷达的观测数据。本研究的重要发现如下。(1)F区纬向风场主要由具有渐逝相位结构的日潮主导。全日潮在245 km处有一个45 m/s的峰值，在连续9天的观测中，全日潮非常稳定。在114 km以下，日潮纬向分量和纬向分量的垂直结构是一致的，类似于经典的太阳S1，1潮汐模式。(2)F区半日潮比全日潮弱得多，并且具有更大的逐日变化。在E区，纬向分量和纬向分量的半日振幅分别在106 ~ 121 km和100 ~ 115 km高度范围内持续增长。在100 km以上，纬向分量的垂直波长约为45 km，与太阳S2，4和S2，5潮汐模态接近。(3)半日潮和半日潮对SSW的响应较强，而在纬向风中，SSW对全日潮的影响有限。在SSW事件期间，半日潮和半日潮的振幅在F区增强，而在E区上部减小。
An extensive analysis of atmospheric tides in the low‐latitude thermosphere and their responses to a major sudden stratospheric warming (SSW) event (18–23 January 2010) is presented. The analysis is based on observational data from the Arecibo dual‐beam incoherent scatter radar. Important findings of the present study are as follows. (1) The diurnal tide with an evanescent phase structure dominates the F region meridional wind field. The diurnal tide has a peak amplitude of 45 m/s occurring at about 245 km, and it is very stable throughout the nine consecutive days' observation. Below 114 km, the vertical structures of the diurnal tide in the meridional and zonal components are consistent, which resemble the classical solar S1, 1 tidal mode. (2) The F region semidiurnal tide is much weaker and has larger day‐to‐day variability than the diurnal tide. In the E region, the semidiurnal amplitudes in the meridional and zonal components grow continuously in the altitude ranges from 106 to 121 km and from 100 to 115 km, respectively. The vertical wavelength of the zonal component is estimated to be 45 km above 100 km, which is close to the solar S2, 4 and S2, 5 tidal modes. (3) The semidiurnal and terdiurnal tides respond strongly to the SSW while the impact that the SSW has on the diurnal tide in the meridional wind is limited. During the SSW event, the amplitudes of the semidiurnal and terdiurnal tides are enhanced in the F region but reduced in the upper E region.