CEDAR/GEM Postdoc: Assess the Impact of Non-Hydrostatic Processes on the Response of the Thermosphere/Ionosphere System to Magnetospheric Forcing

该项目将进行一系列调查，以评估非流体静力过程对热层/电离层系统对磁层强迫响应的影响。几个大气环流模型（GCMs）将参与其中，包括全球电离层-热层模型（GITM）和耦合热层-电离层等离子层模型（CTIP），以及来自Fabry-Perot干涉仪（FPI）和CHAMP和GRACE卫星的数据集，以表征非流体静力过程及其对中性密度变化的影响，并在完全耦合的全球电离层-热层环流模型中模拟这些影响。具体研究工作如下：(1)利用地球空间环流模式（GGCM）研究与电场变化相关的磁层能量输入不确定性。将研究电场变率对平均电场的相对重要性及其对太阳活动、地磁活动和季节水平的依赖；(2)将非静力GITM模型与静力CTIP模型进行比较，量化非静力过程对中性和离子分布的驱动意义；(3)研究非流体静力现象对大气环流空间分辨率和能量输入时间变化的依赖关系。研究非流体静力过程对热层/电离层系统中能量输入的大小和速度的依赖性，将阐明重要的非流体静力现象的临界条件；(4)利用模拟和FPI垂直风观测，证实了非静力过程对大垂直风发展的重要性；(5)将模拟结果与CHAMP卫星和GRACE卫星的中性密度数据进行对比，了解强电磁能量输入下的大中性密度扰动。CHAMP卫星观测到尖峰区中性密度增强。卫星数据将与GITM和CTIP模拟进行比较，以检验非流体静力过程对中性密度的重要性；(6)研究非流体静力过程对大气成分和一氧化氮分布的影响。特别令人感兴趣的是，由于大气涡旋的变化，一氧化氮可能从上层大气输送到下层大气。

This project will perform a series of investigations to assess the impact of non-hydrostatic processes on the response of the thermosphere/ionosphere system to magnetospheric forcing. Several General Circulation Models (GCMs) will be involved, including the Global Ionosphere-Thermosphere Model (GITM) and the Coupled Thermosphere Ionosphere Plasmasphere model (CTIP) along with data sets from Fabry-Perot interferometers (FPI) and from the CHAMP and GRACE satellites to characterize the non-hydrostatic processes and its impacts on the neutral density variation, and to model these effects in fully coupled global ionosphere-thermosphere circulation models. The specific investigations to be performed are: (1) Examine the magnetospheric energy input uncertainty related to the variability of the electric field, using the Geospace General Circulation Model (GGCM) for the magnetosphere. The relative importance of the electric field variability to the average electric field and its dependence on the level of solar activity, geomagnetic activity, and season will be examined; (2) Compare the non-hydrostatic GITM model with the hydrostatic CTIP model to quantify the significance of non-hydrostatic processes in driving both the neutral and ion distributions; (3) Investigate the dependence of the non-hydrostatic phenomena on the spatial resolution of GCMs and the temporal variation of the energy inputs. Examining the dependence of the non-hydrostatic processes on both the magnitude and the speed of energy inputs in the thermosphere/ionosphere system will elucidate the critical conditions for significant non-hydrostatic phenomena; (4) Use the simulations and the FPI vertical wind observations to confirm the importance of the nonhydrostatic processes on the development of large vertical winds; (5) Compare the simulations with neutral density data from CHAMP and GRACE satellites to understand the large neutral density disturbance in response to the intense electromagnetic energy inputs. The cusp region neutral density enhancement is observed by the CHAMP satellite. The satellite data will be compared with both GITM and CTIP simulations to examine the importance of the non-hydrostatic processes on the neutral density; (6) Examine the impact of non-hydrostatic processes on atmospheric composition and the nitric oxide distribution. Of particular interest is the possible transport of nitric oxide from the upper to the lower atmosphere due to the change of the atmospheric vortices.