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Estimating the Short Term Variability of the Migrating Diurnal Tide through Satellite Observations.

机译：通过卫星观测估算日变化潮的短期变化。

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摘要

A method to explicitly estimate the short term variability of the migrating diurnal tide on a global scale is presented and analyzed. The method employs temperature data from two satellite instruments: the MLS (Microwave Limb Sounder) instrument on the EOS (Earth Observing System) Aura spacecraft and the SABER (Sounding of the Atmosphere using Broadband Emission Radiometry) instrument on the TIMED (Thermosphere Ionosphere Mesosphere Energetics and Dynamics) spacecraft. By taking advantage of the four daily solar local time measurements inherent from the two instruments, a least squares fit representing the migrating diurnal tide is constructed. Consequently, the daily zonal mean, migrating diurnal amplitude and migrating diurnal phase are all estimated on a daily basis.;The main objective of the study is to analyze the feasibility of this estimation method. A comparative analysis was first conducted that reveals biases between the two instrument data sets that are as large as 10 K. These instrument biases are removed to reduce potential error. Other error sources include the presence of other tides and waves. The effects of non-migrating tides and waves are attenuated by zonal averaging at constant solar local times. Effects of migrating tides are not attenuated by zonal averaging. The effect of the migrating semidiurnal tide, in particular, is significantly reduced by the least squares approach if the solar local time is evenly sampled. The sampling of solar local time, which changes over time due to orbit of the TIMED satellite, displays a large influence on the results as poor sampling causes nearly linearly-dependent solutions.;The quality of the results for the diurnal amplitude and phase varies over time and geographic location. Comparisons to theory and past observation indicate that estimates are sufficient for scientific analysis near the equatorial-mesosphere where the solar local time sampling is well-spaced, the amplitude of the migrating diurnal tide is large, and the amplitudes of other tides and waves are small. A wavelet analysis for the equatorial mesosphere is performed to illustrate both the long term and short term variations of the tide.
机译：提出并分析了一种在全球范围内显式估计迁徙日潮短期变化的方法。该方法利用来自两个卫星仪器的温度数据：EOS（地球观测系统）Aura航天器上的MLS（微波肢体测深仪）仪器和TIMED（热层电离层中层能级）上的SABER（使用宽带发射辐射法进行大气探测）仪器和动力学）航天器。通过利用这两个仪器固有的四个每日太阳当地时间测量值，构建了代表正移动的日潮的最小二乘拟合。因此，每天的平均日均值，日变化幅值和日变化相都被估计。本研究的主要目的是分析这种估计方法的可行性。首先进行了比较分析，发现两个仪器数据集之间的偏差高达10K。消除了这些仪器偏差以减少潜在的误差。其他误差源包括其他潮汐和波浪的存在。通过在恒定的太阳当地时间进行区域平均，可以使非迁移潮汐和波浪的影响减弱。区域平均不会减弱潮汐迁移的影响。如果对太阳当地时间进行均匀采样，则最小二乘方法会显着降低迁移半日潮的影响。由于TIMED卫星的轨道，太阳当地时间的采样随时间而变化，这对结果显示了很大的影响，因为差的采样会导致几乎线性相关的解;昼夜振幅和相位的结果质量随时间变化时间和地理位置。与理论和以往观测的比较表明，估计值足以进行赤道-中层附近的科学分析，在该处，太阳当地时间采样间隔良好，昼夜迁徙潮汐的振幅大，而其他潮汐和波的振幅小。进行了赤道中层的小波分析，以说明潮汐的长期和短期变化。

著录项

  • 作者

    Nguyen, Vu.;

  • 作者单位

    University of Colorado at Boulder.;

  • 授予单位 University of Colorado at Boulder.;
  • 学科 Aeronomy.;Remote Sensing.;Engineering Aerospace.
  • 学位 M.S.
  • 年度 2011
  • 页码 120 p.
  • 总页数 120
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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