Retrieval of atmospheric static stability from MST radar return signal power
Retrieval of atmospheric static stability from MST radar return signal power
复制标题
从 MST 雷达回波信号功率反演大气静稳定性
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
K. Stebel
中科院分区：
文献类型：
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作者：
D. Hooper;J. Arvelius;K. Stebel
抽象的。提出了一种从 MST 雷达回波信号功率中检索 Brunt-Vaisala 频率 ωB2 平方剖面的经验技术。该技术适用于 1.0-15.7 公里的海拔范围，其有效性仅限于湿度对广义潜在折射率 M 的平均垂直梯度的影响可以忽略的海拔高度。尽管通常认为这是大气层最初几公里上方的情况，但事实表明，直到对流层顶水平，湿度的贡献都可能很大。然而，在特定情况下，该技术在对流层的大部分区域都有效。雷达和（气球载）无线电探空仪衍生的 ωB2 剖面的比较通常在数量和质量上都非常匹配。然而，雷达和无线电探空仪（在雷达站点发射）之间的水平间距随着高度的增加而增加。在山波活动可能高度局部化的情况下，平流层低海拔地区可能会出现较大的差异。这表明无线电探空仪观测结果不一定能代表发射场上方的大气层。
Abstract. An empirical technique for retrieving profiles of the square of the Brunt-Vaisala frequency, ωB2, from MST radar return signal power is presented. The validity of the technique, which is applied over the altitude range 1.0-15.7km, is limited to those altitudes at which the humidity contributions to the mean vertical gradient of generalised potential refractive index, M, can be ignored. Although this is commonly assumed to be the case above the first few kilometres of the atmosphere, it is shown that humidity contributions can be significant right up to the tropopause level. In specific circumstances, however, the technique is valid over large sections of the troposphere. Comparisons of radar- and (balloon-borne) radiosonde-derived ωB2 profiles are typically quantitatively and qualitatively well matched. However, the horizontal separation between the radar and the radiosondes (which were launched at the radar site) increases with increasing altitude. Under conditions of mountain wave activity, which can be highly localised, large discrepancies can occur at lower-stratospheric altitudes. This demonstrates the fact that radiosonde observations cannot necessarily be assumed to be representative of the atmosphere above the launch site.