Atmospheric Tides and Their Effects on Ionosphere-Thermosphere-Mesosphere (ITM) Dynamics, Composition, and Structure

大气潮汐及其对电离层-热层-中间层 (ITM) 动力学、成分和结构的影响

• 批准号: 0903179
• 负责人: Jeffrey Forbes
• 金额: $ 57.48万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-01 至 2013-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0903179&HistoricalAwards=false
• 关键词: Atmospheric; Tides; Their; Effects; Ionosphere

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).This project aims to better delineate the global manifestations of non-migrating tides from the stratosphere through the thermosphere and to better determine the origin of the non-migrating tides which is largely in the troposphere. The investigation of the non-migrating tidal signatures will include examination of their intra-annual, intra-seasonal, and inter-annual variations. Observational data will be employed to drive non-migrating tidal solutions in the Thermosphere-Ionosphere-Mesosphere-Electrodynamics General Circulation Model (GCM) and the Thermosphere-Ionosphere-Electrodynamics GCM housed at the National Center for Atmospheric Research (NCAR). These will be used to obtain realistic simulations of global atmospheric tidal perturbations in winds, temperatures, densities, minor constituents, airglow emissions, electric fields, and ionospheric composition from 30 km to 500 km altitude. Temperature measurements from the TIMED spacecraft between plus-and-minus 50 degrees latitude and 20 - 120 km altitude during 2002-2008, combined with tidal theory, will provide the temperature, wind, and geopotential perturbations needed by the models in order to parameterize and represent tidal effects at the models' lower boundaries. Latest determinations of radiative and latent heating due to rainfall will be included as well as the specification of planetary waves. The model results will form a framework for the interpretation of existing measurements of tidal variations over the globe, especially in terms of the longitude variability in the mesosphere-thermosphere-ionosphere region which recent observations from ground and space have shown to be significant. This longitude variability is pervasive and occurs in neutral winds and temperatures, minor constituent densities and airglow emissions, and ionospheric parameters such as plasma density and electric fields. In terms of broader impacts, the project will support a Ph.D. student and include undergraduate students in the research activities. Since the study will help in the understanding and interpretation of diverse satellite data sets, it will be a resource for satellite science programs in both analysis and interpretation of results, and help improve the NCAR upper atmosphere models.

该奖项是根据2009年《美国复苏和再投资法》(公法111-5)资助的。该项目旨在更好地描绘从平流层到热层的非迁徙潮汐的全球表现，并更好地确定主要在对流层的非迁徙潮汐的来源。对非迁徙潮汐特征的调查将包括对其年内、季节内和年际变化的检查。观测数据将用于在Thermosphere-Ionosphere-Mesosphere-Electrodynamics大气环流模型和设在国家大气研究中心的热层-电离层-电动力学全球环流模型中驱动非迁移性潮汐解。这些将被用来获得从30公里到500公里高度的风、温度、密度、次要成分、气辉发射、电场和电离层组成的全球大气潮汐扰动的真实模拟。2002-2008年期间，计时航天器在正负50度纬度和20-120公里高度之间进行的温度测量，结合潮汐理论，将提供模型所需的温度、风和地球位势扰动，以便对模型下边界的潮汐效应进行参数化和表示。最新的关于降雨引起的辐射和潜热的测定以及行星波的规格也将包括在内。模式结果将形成一个框架，用于解释现有的全球潮汐变化测量结果，特别是关于中层-热层-电离层区域的经度变化，最近从地面和空间进行的观测表明这一点非常重要。这种经度变化是普遍存在的，发生在中性风和温度、次要成分密度和气辉发射以及电离层参数(如等离子体密度和电场)中。就更广泛的影响而言，该项目将支持一名博士生，并将本科生纳入研究活动。由于这项研究将有助于理解和解释不同的卫星数据集，它将成为卫星科学计划分析和解释结果的资源，并有助于改进NCAR高层大气模型。