Collaborative Research: CEDAR--Observational and Numerical Studies of Tide-planetary Wave Coupling

该项目的目标是描述和理解由于大气潮汐和行星波的相互作用而导致的中间层-低层热层的变化。方法是利用TIMED和EOS卫星的温度测量、地面风雷达记录的数据以及观测驱动的非线性机制模型。卫星数据将用于诊断行星波和恢复日潮汐的频谱。全球潮汐风将根据观测到的温度潮汐计算，并在各个雷达的经度和纬度上合成。然后将利用与雷达数据的比较分析来验证全球潮汐风，并阐明局部时间变化可在多大程度上归因于包括跨半球耦合在内的全球尺度影响。潮汐-行星波相互作用的基本机制和起源，包括强迫项、与其他潮汐源相比的相对重要性以及大气背景条件的作用，将从各种模式运行中得到诊断。

The goal of this project is to delineate and understand variability in the mesosphere-lower thermosphere due to the interaction of atmospheric tides and planetary waves. The approach is to employ temperature measurements from the TIMED and EOS satellites, data recorded by ground-based wind radars, and an observation-driven, nonlinear mechanistic model. Satellite data will be used to diagnose planetary waves and to recover the spectrum of diurnal tides. Global tidal winds will be computed from the observed temperature tides, and synthesized at longitudes and latitudes of individual radars. A comparative analysis with the radar data will then be used to validate the global tidal winds and to illuminate the extent to which local temporal variations can be attributed to global-scale influences including cross-hemisphere coupling. The underlying mechanisms and origins of tide-planetary wave interaction, including forcing terms, relative importance compared to other tidal sources and the role of atmospheric background conditions will be diagnosed from various model runs.