Coordinated Analysis of the Zonal Mean Circulation and Semidiurnal Tide in the Mesosphere and Lower-Thermosphere Using Ground Based Radar and TIMED Observations

利用地基雷达和定时观测对中层和低层热层的纬向平均环流和半日潮进行协调分析

• 批准号: 0000956
• 负责人: Scott Palo
• 金额: $ 5.97万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-04-01 至 2004-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0000956&HistoricalAwards=false
• 关键词: Coordinated; Analysis; Zonal; Mean; Circulation

Palo, Scott EATM-0000956As part of this proposal both ground-based and TIDI observations from the TIMED satellite of the horizontal wind field will be used to estimate the spatial structure (latitude, longitude, and height) and temporal evolution of the semidiurnal tide, both migrating and non-migrating, on a monthly basis. The impetus for this effort is twofold. First, the semidiurnal tide has a significant influence on the structure of the MLT. However, little is understood about the underlying variability of the tide and the possible sources of this variability. One possible source of longitudinal variability is due to the non-migrating tidal components, which may result from zonally asymmetric heating in the lower-atmosphere, non-linear wave-wave interactions, or from in-situ sources in the MLT. To attack the problem of variability the longitudinal variability that results from the non-migrating tidal components must be separated from the source and propagation effects, such as the quasi-biennial oscillation, which can modify the structure of the migrating semidiurnal tide. To accomplish these research goals this proposal will utilize data from 21 ground-based meteor and MF radar systems. These data will be collected and analyzed in conjunction with the TIMED TIDI measurements. As a result of this proposal ground-based mean and tidal (24, 12, and 8 hour) estimates will be provided every 4 days from each station. These tidal estimates will be analyzed in conjunction with the TIDI measurements to provide an estimate of the zonal mean circulation, the migrating and non-migrating semidiurnal tides in the MLT on a monthly basis. An effort will be made to integrate ground-based measurements from stations not included herein but which are also funded as part of the TIMED/CEDAR program to extend these results to other latitudes.

帕洛（Scott Eatm-0000956）是该提案的一部分，从水平风场的定时卫星中进行了地面和TIDI观察，将使用每月迁移和非移民的半潮汐潮汐潮汐（纬度，经度和身高）以及半潮流潮汐的暂时进化来估算空间结构（纬度，经度和身高）。 这项工作的动力是双重的。 首先，半腐烂的潮汐对MLT的结构有重大影响。 但是，关于潮汐的潜在可变性以及这种变异性的可能来源几乎没有理解。 纵向变异性的一种可能来源是由于非迁移的潮汐成分引起的，这可能是由于低调，非线性波波相互作用或MLT中的原位来源引起的。 为了攻击可变性问题，必须将非迁移潮汐成分引起的纵向变异性与源和传播效应（例如准双年生振荡）分开，例如准生物振荡，这可以修改迁移的半繁殖潮汐的结构。 为了实现这些研究目标，该建议将利用21个基于地面的流星和MF雷达系统的数据。 这些数据将与定时的TIDI测量结果一起收集和分析。 由于该提案基于地面的平均值和潮汐（24、12和8小时）的估计，每个车站将每4天提供一次估计。 这些潮汐估计值将与TIDI测量结果一起分析，以每月在MLT中估算区域平均循环，迁移和非迁移的半潮流潮汐。 将努力整合本文不包括的电台的基于地面的测量结果，而这些测量值也是作为定时/雪松计划的一部分资助的，以将这些结果扩展到其他纬度。