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首页> 外文期刊>SOLA: Scientific Online Letters on the Atmosphere >Seasonal and Interannual Variation of Mesospheric Gravity Waves Based on MF Radar Observations over 15 Years at Syowa Station in the Antarctic
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Seasonal and Interannual Variation of Mesospheric Gravity Waves Based on MF Radar Observations over 15 Years at Syowa Station in the Antarctic

机译：基于南极Syowa站15年中频雷达观测的中层重力波的季节和年际变化

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References(15) The seasonal and interannual variations of the gravity waves (GWs) in the Antarctic mesosphere were examined using horizontal wind data at altitudes of 50-100 km above the medium frequency (MF) radar at Syowa Station (69.0°S, 39.6°E). The climatology of the GW variance reached a maximum in winter over a wide altitude range of 64-90 km, and the interannual variability was large below 80 km in spring and autumn. These features are consistent with observations from previous studies. In addition, we detected a weak but significant maximum in the GW variance in summer from 70-78 km as well as large interannual variability. Moreover, we examined three possible mechanisms underlying the GW interannual variability observed in summer. The first mechanism was modulation by stratospheric sudden warmings in the Arctic through inter-hemispheric coupling, and it was not clearly observed at Syowa Station. The second mechanism was modulation of the vertical filtering of GWs in association with the breakdown of the polar vortex in the Southern Hemisphere, and it was identified as a potential mechanism. The third mechanism was tropical convection and propagation to the Antarctic region, and it was identified as another likely mechanism of interannual variability in the GWs. This result was supported by the consistency between years with strong tropical precipitation and years with large GW variances at Syowa Station.
机译：参考文献（15）在Syowa站（69.0°S，39.6）使用中风（MF）雷达上方50-100 km的高度的水平风数据，研究了南极中层重力波（GWs）的季节性和年际变化。 °E）。在冬季，在64-90 km的宽海拔范围内，GW变化的气候达到最大值，而在春季和秋季，年际变化在80 km以下较大。这些特征与先前研究的观察结果一致。另外，我们在夏季从70-78 km处发现了一个GW差异很小但很明显的最大值，并且年际差异很大。此外，我们研究了夏季观测到的GW年际变化的三种可能机制。第一种机制是通过北半球之间的平流层耦合，通过平流层突然变暖来调节的，而在Syowa站上还没有清楚地观察到这种机制。第二个机制是与南半球极地涡旋的破坏相关的对GWs垂直滤波的调制，这被认为是一种潜在的机制。第三种机制是热带对流并传播到南极地区，这被认为是全球暖源年际变化的另一种可能机制。这一结果得到了Syowa站热带强降水年份和GW变化较大年份之间一致性的支持。

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