CEDAR Postdoc: Seasonal Variations in Mesopause Region Temperatures, Zonal and Meridional Winds: Climatology and Variability of Mean-State, Diurnal and Semidiurnal Tides

CEDAR 博士后：中层顶地区温度、纬向和经向风的季节变化：平均状态、日潮和半日潮汐的气候学和变化

• 批准号: 0335127
• 负责人: Chiao-Yao She
• 金额: $ 16万
• 依托单位: Colorado State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-01-01 至 2006-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0335127&HistoricalAwards=false
• 关键词: CEDAR; Postdoc; Seasonal; Variations; Mesopause

This is a study of seasonal variations of temperatures and meridional winds in the mesopause region. The Colorado State sodium lidar has been upgraded to a two-beam system capable of simultaneous measurements of mesopause region temperature and winds, over full diurnal cycles, weather permitting. Regular observations in this mode of operation began in May 2002, and by the end of April 2003, one full year of data acquisition was completed giving a total of 1,388 hours of observation with 634 hours under sunlit conditions. The salient feature of a dataset with full-diurnal-cycle coverage lies in its ability to decompose the vertical profiles of dynamical fields (temperature, zonal and meridional winds) into a unique linear superposition of diurnal-mean and oscillations with different tidal periods, plus a residual. In this manner, the diurnal-mean and the amplitude and phase of tidal period oscillations can be determined solely from experimental data. The coherence of tidal excitation and of mean solar forcing prevails over the variability, leading to the convergence of the climatological mean in a multi-day observation. The 6-day composite yields means and diurnal tides that resemble model predictions very well. Preliminary analyses on data acquired in other months have generally shown similar variability and coherent convergence to climatological means, though the behavior in each month depends on the availability of full-diurnal-cycle data and the occurrence frequency of atypical profiles. Though the results of the first year of observation have exceeded expectations, at the present rate, it would require three years of data acquisition to produce a reliable study of climatology and variability. This study will continue the observations and associated science study as a post-doctoral program.

这是一项研究中期地区温度和子午风的季节性变化的研究。科罗拉多州的钠激光雷达（Colorado State Lidar）已被升级到一个两光束系统，能够同时测量间膜区域温度和风，并在充分的昼夜周期中，天气允许。这种操作方式的定期观察始于2002年5月，到2003年4月底，完成了整整一年的数据获取，总共可以观察到1,388小时，在日光下的条件下为634小时。具有全日制周期覆盖范围的数据集的显着特征在于它能够将动态场（温度，区域和子午风）的垂直轮廓分解为昼夜均值的独特线性叠加，并具有不同的潮汐周期的振荡。以这种方式，可以仅从实验数据确定昼夜均值以及潮汐周期振荡的幅度和相位。潮气激发和平均太阳能强迫的一致性在变异性上占上风，从而导致多天观察中气候平均值的融合。 6天的复合材料产生的均值和昼夜潮流非常类似于模型预测。对其他月份获得的数据的初步分析通常显示出与气候平均值相似的变异性和相干收敛性，尽管每个月的行为取决于全局循环数据的可用性以及非典型特征的发生频率。尽管观察第一年的结果超出了预期，但按照目前的速度，它需要三年的数据获取才能对气候和可变性进行可靠的研究。这项研究将继续进行观察和相关的科学研究，作为博士后计划。