通过分析中国河北香河站MST(Mesosphere-Stratosphere-Troposphere)雷达2012-2014年的水平风场数据,研究了北半球中纬地区对流层和低平流层(Troposphere and Lower Stratosphere,TLS)区域大气行星波的特性.谱分析发现,在这一区域准16天...通过分析中国河北香河站MST(Mesosphere-Stratosphere-Troposphere)雷达2012-2014年的水平风场数据,研究了北半球中纬地区对流层和低平流层(Troposphere and Lower Stratosphere,TLS)区域大气行星波的特性.谱分析发现,在这一区域准16天波和准10天波占据主导地位,准16天波更为显著.在对流层区域,行星波具有丰富的频谱成分,活动具有间断性,持续时间一般不超过三个月,并没有明显的季节性变化特征,其中纬向分量的振幅大于经向分量.在平流层区域(高度17km以上),行星波一般出现在冬季,并且主要在纬向分量中.通常平流层区域的振幅要小于对流层区域.结合MERRA再分析资料分析了强行星波传播特性,结果表明:2014年2—3月纬向分量中的准16天波垂直向上传播,垂直波长约为64km,纬圈波数约为2,纬向传播方向自西向东,水平波长约为15324.7km,对应的相速度为11.1m·s^(-1)(向东为正);2014年5月纬向分量中的准10天波在10~18km高度范围内向下传播,垂直波长约为50km,纬圈波数约为1,传播方向自西向东,水平波长约为30649.4 km,对应相速为35.5 m·s^(-1).展开更多
大气水平风场是研究大气动力特征、过程以及上下层之间的动力耦合的重要参数。MST(Mesosphere Stratosphere and Troposphere)雷达在大气风场探测中发挥独特的作用,可获取高时空分辨率的大气风场廓线数据。在国家重大科技基础设施项目...大气水平风场是研究大气动力特征、过程以及上下层之间的动力耦合的重要参数。MST(Mesosphere Stratosphere and Troposphere)雷达在大气风场探测中发挥独特的作用,可获取高时空分辨率的大气风场廓线数据。在国家重大科技基础设施项目子午工程支持下由中国科学院大气物理研究所建设的北京MST雷达位于中国科学院大气物理研究所香河大气综合观测试验站(39.75°N,116.96°E)。本数据集包含2012年北京MST雷达探测的3-25 km大气水平风速、水平风向数据。垂直分辨率600米,探测时间间隔为30分钟。去除异常点后的风场廓线与探空数据有很好的一致性。本数据集可在对流层-下平流层大气风场、波动等大气动力学以及大气过程研究中发挥独特作用。展开更多
Based on the data at^40°N at different longitudes during different stratospheric sudden warming(SSW)events,the responses of zonal winds in the stratosphere,mesosphere and lower thermosphere to SSWs are studied in...Based on the data at^40°N at different longitudes during different stratospheric sudden warming(SSW)events,the responses of zonal winds in the stratosphere,mesosphere and lower thermosphere to SSWs are studied in this paper.The variations of zonal wind over Langfang,China(39.4°N,116.7°E)by MF radar and the modern era retrospective-analysis for research and applications(MERRA)wind data during 2010 and 2013 SSW and over Fort Collins,USA(41°N,105°W)by lidar and MERRA wind data during 2009 SSW are compared.Results show that the zonal wind at^40°N indeed respond to the SSWs while different specifics are found in different SSW events or at different locations.The zonal wind has significant anomalies during the SSWs.Over Langfang,before the onset of 2010 and 2013 SSW,the zonal wind reverses from eastward to westward below about 60–70 km and accelerates above this region,while westward wind prevails from 30 to 100 km after the onset of2010 SSW,and westward wind prevails in 30–60 and 85–100 km and eastward wind prevails in 60–85 km after the onset of2013 SSW.Over Fort Collins during 2009 SSW,eastward wind reverses to westward in 20–30 km before the onset while westward wind prevails in 20–30 and 60–97 km and eastward wind prevails in 30–60 and in 97–100 km after the onset.Moreover,simulations by the specified dynamics version of the whole atmosphere community climate model(SD-WACCM)are taken to explain different responding specifics of zonal wind to SSW events.It is found that the modulation of planetary wave(PW)plays the main role.Different phases of PWs would lead to the different zonal wind along with longitudes and the different amplitudes and phases in different SSW events can lead to the different zonal wind responses.展开更多
文摘大气水平风场是研究大气动力特征、过程以及上下层之间的动力耦合的重要参数。MST(Mesosphere Stratosphere and Troposphere)雷达在大气风场探测中发挥独特的作用,可获取高时空分辨率的大气风场廓线数据。在国家重大科技基础设施项目子午工程支持下由中国科学院大气物理研究所建设的北京MST雷达位于中国科学院大气物理研究所香河大气综合观测试验站(39.75°N,116.96°E)。本数据集包含2012年北京MST雷达探测的3-25 km大气水平风速、水平风向数据。垂直分辨率600米,探测时间间隔为30分钟。去除异常点后的风场廓线与探空数据有很好的一致性。本数据集可在对流层-下平流层大气风场、波动等大气动力学以及大气过程研究中发挥独特作用。
基金supported by the National Natural Science Foundation of China (Grant No. 41104099)
文摘Based on the data at^40°N at different longitudes during different stratospheric sudden warming(SSW)events,the responses of zonal winds in the stratosphere,mesosphere and lower thermosphere to SSWs are studied in this paper.The variations of zonal wind over Langfang,China(39.4°N,116.7°E)by MF radar and the modern era retrospective-analysis for research and applications(MERRA)wind data during 2010 and 2013 SSW and over Fort Collins,USA(41°N,105°W)by lidar and MERRA wind data during 2009 SSW are compared.Results show that the zonal wind at^40°N indeed respond to the SSWs while different specifics are found in different SSW events or at different locations.The zonal wind has significant anomalies during the SSWs.Over Langfang,before the onset of 2010 and 2013 SSW,the zonal wind reverses from eastward to westward below about 60–70 km and accelerates above this region,while westward wind prevails from 30 to 100 km after the onset of2010 SSW,and westward wind prevails in 30–60 and 85–100 km and eastward wind prevails in 60–85 km after the onset of2013 SSW.Over Fort Collins during 2009 SSW,eastward wind reverses to westward in 20–30 km before the onset while westward wind prevails in 20–30 and 60–97 km and eastward wind prevails in 30–60 and in 97–100 km after the onset.Moreover,simulations by the specified dynamics version of the whole atmosphere community climate model(SD-WACCM)are taken to explain different responding specifics of zonal wind to SSW events.It is found that the modulation of planetary wave(PW)plays the main role.Different phases of PWs would lead to the different zonal wind along with longitudes and the different amplitudes and phases in different SSW events can lead to the different zonal wind responses.
