Vertical tidal wind climatology from full‐diurnal‐cycle temperature and Na density lidar observations at Ft. Collins, CO (41°N, 105°W)
Vertical tidal wind climatology from full‐diurnal‐cycle temperature and Na density lidar observations at Ft. Collins, CO (41°N, 105°W)
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科罗拉多州柯林斯堡（北纬 41°，西经 105°）的全日循环温度和钠密度激光雷达观测的垂直潮汐风气候学
DOI：
10.1002/2013jd020338
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
D. Krueger
中科院分区：
文献类型：
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作者：
T. Yuan;C. She;J. Oberheide;D. Krueger
垂直风及其潮汐扰动对于理解中间层和低热层的能量和动量收支是至关重要的。然而，由于潮汐风分量的量级较低（几厘米/秒），并且即使在数小时内平均，通常也小于测量不确定度，因此对该潮汐风分量进行直接和精确的观测极具挑战性。本文提出了一种由钠密度潮推求垂直风潮的动力学方法，并用20多年前的有限资料验证了该方法的有效性。本文利用波扰动引起的Na密度扰动与大气密度扰动之间的线性关系，对该方法进行了推广，提出了两种新的由Na激光雷达观测到的中层顶Na密度和温度确定垂直风潮的公式。利用已建立的柯林斯堡（41°N，105°W）平均和潮汐扰动的气候学，基于2002年至2008年的数据集，我们推导出周日和半日垂直风潮汐的所有三个公式。推导出的潮汐振幅和相位相互比较，沿着与最近的，但很好地研究和测试，气候潮汐模型的热层（CTMT）的基础上的霍夫模式扩展（HME），然后通过潮汐谱分析，以解决不同的潮汐成分的贡献，在这个中纬度位置的总潮汐行为。比较表明，激光雷达潮汐结果和模型之间的一般协议。
Vertical wind and its tidal perturbations are critical for understanding energy and momentum budgets within the Mesosphere and Lower Thermosphere. However, direct and precise observations of this tidal wind component are highly challenging due to its low magnitude (a few cm/s), and often smaller than the measurement uncertainty even if averaged over hours. A dynamical method to determine vertical wind tides from Na density tides was proposed and its validity tested by limited amount of data two decades ago. In this paper, we utilize the linear relationship between the perturbations of Na density and atmospheric density caused by wave perturbations to extend this method, and devise two new formulations for determining vertical wind tides from the Na lidar observed Na density and temperature in the mesopause region. By taking advantage of the established climatology of mean and tidal perturbations over Fort Collins, CO (41°N, 105°W), based on the data set between 2002 and 2008, we deduce diurnal and semidiurnal vertical wind tides from all three formulations. The deduced tidal amplitudes and phases are intercompared, along with the most recent, but well studied and tested, Climatological Tidal Model of the Thermosphere (CTMT) based on the Hough Mode Extension (HME) followed by a tidal spectrum analysis to address the different tidal components contribution to the total tidal behavior at this midlatitude location. The comparisons show general agreement between the lidar tidal results and the model.