CEDAR: Lower Thermosphere Coupling Study

本文研究了决定低层热层（约90-150 km）动力、热力和化学结构的耦合过程：向上传播的重力波、潮汐和行星波与低层大气区域的动力耦合；以及由于低层热层动力学/电动力学相互作用而导致的O、NO、Na和其他少量中性和电离物质的垂直和纬度输送。一系列动力学模型将被用来解决诸如重力波、潮汐和平均流之间的自洽相互作用等问题；由于这种相互作用而产生的对流不稳定性；湍流混合和“潮汐混合”对小物种迁移的季节/纬度和局地时间变化；以及重力波作为热层动量源的作用。此外，一种新开发的同化数据分析方法将应用于全球潮汐风和温度的测量，以提供(a)自一致的全球潮汐风、温度和密度预测；(b) NCAR热层-电离层环流模式的实际潮汐边界条件，用于研究潮汐对100 km以上大气区域动力学和小组分化学的影响

This study is devoted to those coupling processes which determine the dynamical, thermal, and chemical structure of the lower thermosphere (ca. 90-150 km): dynamical coupling with lower atmosphere regions due to upward propagating gravity waves, tides, and planetary waves; and vertical and latitudinal transport of O, NO, Na, and other minor neutral and ionized species due to dynamical/electrodynamic interactions in the lower thermosphere. A range of dynamical models will be utilized to address such problems as self-consistent interaction between gravity waves, tides, and the mean flow; convective instability arising as a result of such interactions; seasonal/latitudinal and local time variations in turbulent mixing and "tidal mixing" on the transport of minor species; and the role of gravity waves as a momentum source for the thermosphere. In addition, a newly developed method of assimilative data analysis will be applied to global measurements of tidal winds and temperatures to provide (a) self-consistent global predictions of tidal winds, temperatures, and densities; and (b) realistic tidal boundary conditions for the NCAR Thermosphere-Ionosphere General Circulation model to study tidal effects on the dynamics and minor consituent chemistry of the atmospheric region above 100 km. ***