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首页> 外文期刊>Geophysical Research Letters >Planetary and gravity waves in the mesosphere and lower thermosphere region over Tirunelveli (8.7°N, 77.8°E) during stratospheric warming events
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Planetary and gravity waves in the mesosphere and lower thermosphere region over Tirunelveli (8.7°N, 77.8°E) during stratospheric warming events

机译：平流层变暖事件期间蒂鲁内尔维利（8.7°N，77.8°E）上中层和下热层区域的行星波和重力波

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摘要

An investigation of planetary wave (PW) activities in UKMO (UK Meteorological Office) winds during winter of the years 1998-99 and 2005-06, when major sudden stratospheric warming (SSW) events occurred, shows that the amplitude of PW of zonal wave number 1 is considerably reduced in zonal winds, when the warming event is onset and the reduced activity persists several days even after the end of the SSW event. Similar reduction of PW activity in zonal winds has been observed in the wavelet spectrum of MF radar zonal winds at altitudes 84-98 km over Tirunelveli (8.7°N, 77.8°E). During this period of reduced PW activity, enhancement in gravity wave activity is observed during 2005-06 and is not observed during 1998-99 and the mean meridional winds change to more equatorward during 2005-06 and remain poleward during 1998-99. In accordance with TIME-GCM results, our observations show that the wind reversal occurred in the stratosphere during major warming events allows more eastward gravity waves to propagate into the mesosphere and lower thermosphere (MLT) region, which causes changes in the meridional circulation from poleward to equatorward.
机译：对1998-99年和2005-06年冬季（发生重大平流层变暖（SSW）事件）期间UKMO（英国气象局）风中行星波（PW）活动的调查表明，纬向波PW的振幅当变暖事件开始时，纬向风中的1号会大大减少，即使在SSW事件结束后，减少的活动仍持续数天。在蒂鲁内尔维利（8.7°N，77.8°E）上方84-98 km的中频雷达纬向风的小波谱中，也观察到纬向风中PW活性的类似降低。在此期间，PW活性降低，在2005-06年期间观察到重力波活动增强，而在1998-99年期间未观察到重力波活动，并且平均经向风在2005-06年期间向更赤道方向变化，并在1998-99年期间保持极向状态。根据TIME-GCM的结果，我们的观察结果表明，在重大变暖事件期间平流层发生的风向反转使更多的东向重力波传播到中层和下热层（MLT）区域，这导致子午线的子午环流发生了变化。赤道。

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