Collaborative Research: NSWP: Generation of Global Forecasts of Middle and Upper Atmospheric Gravity Wave Activity as Applied to the Prediction of Equatorial Spread-F (ESF)

合作研究：NSWP：中高层大气重力波活动全球预报的生成，应用于赤道传播-F（ESF）的预测

• 批准号: 0522137
• 负责人: Andrew Gerrard
• 金额: $ 27.33万
• 依托单位: Clemson University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-03-01 至 2007-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0522137&HistoricalAwards=false
• 关键词: Collaborative; Research; NSWP; Generation; Global

A global gravity wave model using ray-tracing techniques is produced and verified with ground-based and satellite data.. The methodology begins by ingesting daily analysis and five-day forecasts from the National Weather Service to identify tropospheric structures (synoptic and mesoscale systems, thunderstorms, hurricanes, etc.) that are known to be gravity wave sources. Gravity wave spectra assigned at the identified tropospheric sources are then propagated from the troposphere through the middle atmosphere and to 400 km altitude using extant linear ray-tracing numerical codes. The background atmosphere above the tropopause is characterized by models and by available data. The over-arching purpose is to evaluate the hypothesis that gravity-wave sources as triggers of Equatorial Spread-F (ESF), a phenomenon in the equatorial ionosphere characterized by large ion density depletions, or bubbles, reaching altitudes of 500 km and higher. These ionospheric irregularities are known to produce Global Positioning System radio frequency scintillations, and stand as an outstanding forecasting challenge for the Space Weather community.

利用射线追踪技术建立了全球重力波模型，并用地面和卫星资料进行了验证。该方法首先从国家气象局获取每日分析和五天预报，以确定对流层结构(天气和中尺度系统、雷暴、飓风等)。它们是已知的重力波源。然后，利用现有的线性射线追踪数值代码，将已确定对流层来源的重力波谱从对流层通过中层大气传播到400公里高度。对流层顶上方的背景大气以模型和现有数据为特征。主要目的是评估重力波源触发赤道扩展F(ESF)的假设，ESF是赤道电离层中的一种现象，其特点是大量离子密度耗尽或气泡，达到500公里或更高的高度。众所周知，这些电离层不规则性会产生全球定位系统的射频闪烁，对空间气象界来说是一项突出的预报挑战。