Response of Atomic Hydrogen and Oxygen to Solar Radiation Changes: Measurements and Simulations

原子氢和氧对太阳辐射变化的响应：测量和模拟

• 批准号: 5454177
• 负责人: Professor Dr. Martin Riese
• 金额: --
• 依托单位: Institut für Bio- und Geowissenschaften (IBG)
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2005
• 资助国家: 德国
• 起止时间: 2004-12-31 至 2009-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5454177?language=en
• 关键词: Response; Atomic; Hydrogen; Oxygen; Solar

The scientific objective of the next part of the HYDOX project is to distinguish between the direct (photochemical) and indirect (dynamical) solar cycle effects in the upper mesosphere and lower thermosphere (UMLT). Our tools are global fields of atomic oxygen, hydrogen, and chemical heating rates, and the NCAR ROSE general circulation model. During the first part of the project, we derived these fields from measurements of the Sciamachy and GOMOS instruments on board the Envisat satellite. We identified clear solar cycle dependencies and performed first simulations of the data by means of the ROSE model. The discrimination of photochemical and dynamical solar cycle effects in the data by means of a model requires the best possible representation of the lower atmosphere, because the dynamics in the UMLT region is highly non-local. Therefore, we propose to take active part in the advancement of the ROSE model recently started at NCAR to improve the tropospheric forcing of the model. This will give a better representation of solar tides, which dominate atmospheric variability in the UMLT region. We plan to perform several model sensitivity studies with the improved version of the model to study the role of solar forcing for tidal sources and wave filtering. The simulations will be compared to the measured data to discriminate the dynamical effects from the photochemical solar forcing in the UMLT region.

HYDOX项目下一部分的科学目标是区分中间层上部和热层下部的直接（光化学）和间接（动力）太阳周期效应。我们的工具是原子氧，氢和化学加热速率的全球领域，以及NCAR ROSE大气环流模型。在该项目的第一部分，我们从环境卫星上的Sciamachy和GOMOS仪器的测量得出这些领域。我们确定了明确的太阳周期依赖关系，并通过ROSE模型对数据进行了首次模拟。通过模型对数据中的光化学和动力学太阳周期效应进行区分，需要尽可能最好地代表低层大气，因为UMLT区域的动力学是高度非局部的。因此，我们建议积极参与NCAR最近开始的ROSE模式的改进，以改善模式的对流层强迫。这将更好地代表太阳潮汐，这在UMLT地区的大气变化占主导地位。我们计划进行几个模型的敏感性研究与改进版本的模型，研究太阳强迫的潮汐源和波过滤的作用。模拟结果将与实测数据进行比较，以区分UMLT地区光化学太阳强迫的动力学效应。