重力波动量通量的钠测温测风激光雷达探测研究

项目名称： 重力波动量通量的钠测温测风激光雷达探测研究

项目编号： No.41304122

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 天文学、地球科学

项目作者： 方欣

作者单位： 中国科学技术大学

项目金额： 25万元

中文摘要： 重力波是重要的大气波动之一，其在驱动中高层大气环流中扮演重要角色。目前，各种大气模式能在一定精度上模拟大气的各种波动及其对大气环流的贡献，无法精确预报空间天气，因此重力波动量通量高精度探测研究是尤为必要的。本项目以中国科学技术大学研制的我国首台钠测温测风激光雷达为探测平台，通过对中高层大气温度和风场数据的高时空分辨率中长期观测，开展此区域大气温度和风场垂直分布的统计特性研究。采用双光束探测方式，通过对向东和向西两个方向纬向风的同时探测，扣除大尺度波动趋势，得到视向风速扰动量，然后分析计算重力波动量通量，获得中纬度区中间层顶和低热层区域重力波动量通量的变化特征。并结合其他仪器观测数据和模式结果，定量研究重力波和潮汐波相互作用及重力波和背景大气的相互作用。

中文关键词： 重力波动量通量；中间层顶和低热层区域；大气温度；大气风场；钠测温测风激光雷达

英文摘要： Atmospheiric gravity wave, one kind of atmospheric waves, plays an important role in driving middle and upper atmosphere circulation. At present, various atmospheic model can simulate some waves characteristic and its forcing on circulation to a certain extent, but can not predict space weather in accuracy. Therefore,it is particularly necessary to observe gravity wave momentum flux with high precision. This project is based on the narrowband high-spectral resolution sodium temperature/wind lidar firstly developed at the University of Technology of China(USTC) in hefei, China (31.5 N，117 E). On one hand, with the medium and long term datasets with high vertical and temporal resolution observed by our own sodium temperature/wind lidar, we study the varying characteristics of the mesopause and low thermosphere region. On the other hand, we use dual-beam method with each laser beam pointing either east or west to measure east or west wind, and then caculate gravity wave momentum flux following by getting the wind perturbation after detrending large-scale waves. Finally, we obtain the characteristics of gravity wave momentum flux of the region in mid-latitude zone.Combined with other instruments observational data and model data, we quantitatively study the interaction between gravity waves and tides as well as the

英文关键词： gravity wave momentum flux；mesopause and lower thermospheric region；atmospheric temperature；wind；sodium temperature/wind lidar