Gravity wave propagation and dissipation from the stratosphere to the lower thermosphere
Gravity wave propagation and dissipation from the stratosphere to the lower thermosphere
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DOI：
10.1029/2008jd010112
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发表时间：
2009-06
影响因子：
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通讯作者：
Xian Lu;A. Z. Liu;G. Swenson;Tao Li;T. Leblanc;I. Mcdermid
中科院分区：
文献类型：
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作者：
Xian Lu;A. Z. Liu;G. Swenson;Tao Li;T. Leblanc;I. Mcdermid
[1]利用毛伊岛（20.7°N，156.3°W）共振钠（Na）风/温度激光雷达的一夜（2003年10月28日）温度和水平风测量值以及夏威夷莫纳罗亚天文台（MLO，19.5°N，155.6°W）瑞利激光雷达的温度测量值，研究了从平流层下部到热层下部的重力波（GW）传播。在35至103公里处发现了一个主波模态。该波部分消散并向上传播，温度振幅的标度高度为0.14 km。在平流层顶附近存在一个阻尼层，在那里波动幅度较小，这也对应于一个低静稳定度层。中层（12 - 13公里）的垂直波长大于平流层（6 - 7公里），这与静稳定度随高度降低相一致。对Na激光雷达测风资料的速矢图分析表明，该波向北传播，在84 ~ 103 km范围内，其水平波长为2140 km，内禀周期为15 h。其视周期为1.6h，与背景风的多普勒频移相一致。有人建议，对流区在赤道以南的夏威夷提供了一个恒定的GW源，是负责整个晚上观察到的GW。
[1] One-night (28 October 2003) temperature and horizontal wind measurements by a resonance sodium (Na) wind/temperature lidar at Maui (20.7°N, 156.3°W) and temperature measurement by a Rayleigh lidar at Mauna Loa Observatory (MLO, 19.5°N, 155.6°W), Hawaii, were used to study gravity wave (GW) propagation from the lower stratosphere to the lower thermosphere. A dominant wave mode was identified from 35 to 103 km. The wave was partially dissipated and propagating upward with a scale height of temperature amplitude at ∼14 km. A damping layer was present around the stratopause where the wave amplitude was small, which also corresponded to a low static stability layer. The vertical wavelengths were larger in the mesosphere (12―13 km) than in the stratosphere (6―7 km), consistent with the decreasing static stability with altitude. Hodograph analysis of the Na lidar wind data showed that the wave was propagating northward and the horizontal wavelength was 2140 km and intrinsic period was 15 h in the region 84―103 km. The apparent period was ∼6 h and consistent with Doppler shift of the background wind. It is suggested that the convective zone over the equator to the south of Hawaii provided a constant GW source that is responsible for the observed GW throughout the night.