Mesoscale Motions Over the Plains from MST Radar Observations

MST 雷达观测中平原上空的中尺度运动

• 批准号: 9005979
• 负责人: Gregory Nastrom
• 金额: $ 24.35万
• 依托单位: St. Cloud State University
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-02-15 至 1994-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9005979&HistoricalAwards=false
• 关键词: Mesoscale; Motions; Over; Plains; MST

The object of this research is to investigate the application of observations from MST/ST radars to aspects of mesoscale circulation. In particular, observations from the Flatland radar located near Champaign, Illinois, will be used to explore three issues. The first issue is that there is a need for better understanding of the relationship between the space and time scales of vertical motions, especially relating to the interpretation of measurements of vertical motions by ST radars and the synoptic or sub-synoptic scale circulation. Coupled with this issue is a need to identify the source of the apparent downward bias in measured vertical velocities. Second, measurements taken with a five-beam configuration are now available and will be used to study gravity waves. Case studies and statistical summaries of features such as the vertical flux of horizontal momentum will be used to characterize the source mechanisms of mesoscale motions and the effects of varying background weather conditions. Also, they will help interpret the variance spectrum of horizontal motions. Third, the data from Flatland will be combined with other mesoscale observing systems located nearby, such as the microbarograph array operated by NOAA and the Urbana ST radar, to provide physical insights of mesoscale processes not possible with a single radar.//

本研究的目的是调查 应用MST/ST雷达观测资料， 中尺度环流 特别是， 位于伊利诺伊州尚潘附近的平地雷达将用于 探讨三个问题。 第一个问题是， 为了更好地理解 和垂直运动的时间尺度，特别是与 ST雷达垂直运动测量结果的解释 以及天气尺度或次天气尺度环流。 加上 这个问题是一个需要确定的来源， 测量的垂直速度的向下偏差。 第二、 采用五光束配置进行的测量现在 它将用于研究重力波。 案例研究 以及对诸如垂直通量等特征的统计总结 水平动量将被用来描述源的特征 中尺度运动的机制和变化的影响 背景天气条件 此外，他们将帮助解释 水平运动的方差谱。 第三，数据 将与其他中尺度观测相结合 位于附近的系统，如微气压阵列操作 由NOAA和Urbana ST雷达，提供物理见解， 单台雷达无法实现中尺度过程。//