TIMED/CEDAR: Support for the Development of a Sequential Estimator for Global Wind Mapping

ATM9813765abs研究人员将开发一种卡尔曼滤波技术，用于全球风测绘。卡尔曼滤波使用统计和顺序估计，以产生每日网格天气图从异步卫星测量。 全球每日天气图能够客观地确定空间波传播和行星尺度特征的逐日变化。 天气场易于进行常规的短时傅立叶分析，便于同化到数值模式中。 由于易于解释，绘制的天气场已被科学界广泛用于研究对流层和平流层动力学。 然而，卡尔曼滤波方法传统上需要规定行星尺度的地球物理统计数据，这在很大程度上是未知的中间层和低热层风。 本研究的主要目的是确定这些未知的统计数据，从现有的低热层风数据集。 研究结果将用于支持CEDAR/TIMED的科学目标。 CEDAR代表耦合，能量学和大气区域动力学，是一个全球变化计划，将理论建模与地面测量相结合，以研究高层大气和电离层。 TIMED（Thermosphere，Ionosphere，Mesosphere Energetics and Dynamics）是美国国家航空航天局的一个卫星计划，用于研究类似的大气层区域。 CEDAR/TIMED联合方案旨在协调地面和空间观测，以更好地了解低热层和电离层的物理过程。

ATM9813765absThe investigators will develop a Kalman filtering technique for global wind mapping. Kalman filtering uses statistics and sequential estimation to produce daily gridded synoptic mappings from asynchronous satellite measurements. Global daily synoptic mappings enable objective determination of spatial wave propagation and day-to-day variability of planetary scale features. Synoptic fields lend themselves easily to conventional longitude-time Fourier analysis and are convenient for assimilation into numerical models. Because of their ease of interpretation, mapped synoptic fields have been widely used by the scientific community investigating tropospheric and stratospheric dynamics. However, the Kalman filtering approach traditionally requires the prescription of planetary-scale geophysical statistics, which are largely unknown for mesospheric and lower thermospheric winds. The main objective of this study is to determine these unknown statistics from an existing lower thermospheric wind data set. The results will be used to support CEDAR/TIMED science goals. CEDAR, which stands for Coupling, Energetics, and Dynamics of Atmospheric Regions, is a global change program that combines theoretical modeling with ground-based measurements to study the upper atmosphere and ionosphere. TIMED, for Thermosphere, Ionosphere, Mesosphere Energetics and Dynamics, is a NASA satellite program to study similar regions of the atmosphere. The joint CEDAR/TIMED program aims to coordinate ground-based and space-based observations to achieve better understanding of physical processes in the lower thermosphere and ionosphere.