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Atmospheric stability at 90 km, 78°N, 16°E

机译:90 km,78°N,16°E时的大气稳定性

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We employ observations obtained from a meteor wind radar to derive ambipolar diffusion coefficients, neutral temperatures, temperature gradients and, subsequently, Brunt-V?is?l? frequencies at an altitude of 90 km over Svalbard (78°N, 16°E). The derived values showed a good agreement with independent measurements at each step of the analysis. Current atmospheric models are based on sparse data obtained at such high latitude, so these results represent a viable alternative for incorporating in subsequent studies of atmospheric dynamics, particularly if the derived monthly variabilities are included. The Brunt-V?is?l? frequencies are then combined with wind shear measurements to estimate horizontally averaged gradient Richardson Numbers (Ri). We find Ri to be consistently larger in summer than winter due to wind shears being similarly larger in winter and augmented by the inverse seasonal variation in Brunt-V?is?l? frequency. These seasonal variations result in Ri indicative of dynamic stability in summer and instability in winter. The variabilities in wind shear and Brunt-V?is?l? frequency are then included to—albeit more qualitatively—illustrate the distribution between stability and static and dynamic instabilities as a function of season, using a novel portrayal pioneered by Zink and Vincent ( J. Geophys. Res ., 109, doi:10.1029/2003JD003992, 2004). The resulting picture is discussed in the framework of current conceptions of distribution of turbulent energy dissipation with height and season and of current opinion of the mesopause structure at 78°N
机译:我们使用从流星风雷达获得的观测结果来导出双极性扩散系数,中性温度,温度梯度,以及随后的Brunt-V?is?l?斯瓦尔巴群岛(78°N,16°E)上方90公里处的高频率。在分析的每个步骤中,得出的值与独立的测量值均显示出良好的一致性。当前的大气模型基于在如此高的纬度下获得的稀疏数据,因此这些结果代表了一种可行的替代方案,可用于随后的大气动力学研究,特别是如果包括得出的月度变化。 Brunt-V?是吗?然后将频率与风切变测量值组合起来,以估计水平平均梯度理查森数(Ri)。我们发现,由于冬季的风切变同样大,并且由于Brunt-V?is?l的反季节变化而加剧,所以夏季的Ri总是比冬季大。频率。这些季节变化导致Ri指示夏季动态稳定和冬季不稳定。风切变和Brunt-V?is?l?然后使用Zink和Vincent(J. Geophys。Res。,109,doi:10.1029 / 2003JD003992所倡导的新颖写照)包括频率,以更定性地说明稳定性与静态和动态不稳定性之间随季节的变化。 ,2004)。在当前能量分布随高度和季节的分布概念以及对78°N处的更年期结构的当前观点的框架下,讨论了所得的图像

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