Wind fluctuations near a cold vortex-tropopause funnel system observed by the MU radar     

Shoichiro Fukao  Manabu D. Yamanaka  Hiromasa Matsumoto  Toru Sato  Toshitaka Tsuda  Susumu Kato 《Pure and Applied Geophysics》1989,130(2-3):463-479

Vertical and temporal variations of three-dimensional wind velocity associated with an upper-tropospheric cold vortex-tropopause funnel system were observed by an MST radar in Japan (the MU radar). Marked changes of vertical velocity and horizontal wind direction were found between the inside and outside of the cold vortex. The vertical velocity activity outside the vortex was asymmetric; it was most active in a sector before the vortex. Unsaturated internal gravity waves in their generation stage contribute predominantly to the vertical velocity activity, suggesting that tropospheric occluded cyclones may be a possible source of middle-atmospheric gravity waves through the geostrophic adjustment process.  相似文献   

Internal gravity wave selection in the upper troposphere and lower stratosphere observed by the MU radar: Preliminary results     

Manabu D. Yamanaka  Shoichiro Fukao  Hiromasa Matsumoto  Toru Sato  Toshitaka Tsuda  Susumu Kato 《Pure and Applied Geophysics》1989,130(2-3):481-495

Marked wavelike variations of the lower stratospheric wind observed on 7–10 May, 1985 by an MST radar in Japan (by the MU radar) are analyzed assuming that they are induced by monochromatic internal inertio-gravity waves. These variations are mainly composed of two modes (periods: 22 and 24 hours), both of which have zonal phase velocities (C _X ) slower than the mean westerly wind (). A statistical analysis of the zonal phase velocity shows thatC _X above andC _X below the tropopause jet stream, which is considered to be a vivid proof of wave selection due to the tropospheric mean flow and upward wave emission from the tropopause jet. A comparison between the MU radar results and routine meteorological observations leads to the conclusion that the marked waves appear when the jet stream takes a maximum wind speed.  相似文献   

A study on the sensitivity of the radar scattering coefficient to oceanic winds     

Abhijit Sarkar  Raj Kumar 《Journal of Earth System Science》1985,94(3):249-259

Sensitivity of the radar scattering coefficient to the oceanic wind vector in the midangular range for frequencies from L- to Ku- band is studied. This is based on computations of scattering coefficient via the two-scale scattering theory employing a semi-empirical model for the ocean spectrum suggested by Fung and Lee and the slope distribution by Cox and Munk. Higher frequency and incident angles of over 45 degrees seem to yield better wind sensitivity.  相似文献   

Digital topography of volcanoes from radar interferometry: an example from Mt Vesuvius,Italy     

Peter J. Mouginis-Mark  Harold Garbeil 《Bulletin of Volcanology》1993,55(8):566-570

A new airborne radar technique can generate digital topographic data for volcanoes at a scale of 10 m spatial and 1–5 m vertical, with a swath width of 6.4 km. Called TOPSAR, the intrument is an interferometric radar flown on the NASA DC-8 aircraft. TOPSAR data permit the quantification of volcano slopes, volumes, and heights, and as such will be valuable for the analysis of lava flows, domes, and lahar channels. This instrument will be flown over several volcanoes in the near future, providing volcanologists with valuable data sets for the analysis of high-resolution topography. We briefly illustrate the potential use of TOPSAR data through examples from Mt Somma and Vesuvius, Italy.  相似文献   

闽南地区短时区域暴雨的天气及多普勒雷达资料概念模型   总被引：9，自引：4，他引：9       下载免费PDF全文

郭林  陈礼斌  施碧霞  李建通 《气象》2003,29(5):41-45

通过对1996—1998年42个短时区域暴雨过程进行分析和总结，将天气形势和多普勒天气雷达资料相结合，建立了3种非台风型的闽南短时区域暴雨的天气及多普勒雷达资料概念模型，并对短时区域暴雨的时空分布特征作了统计分析。  相似文献   

积层混合性暴雨三维动力结构的双多普勒雷达对比分析   总被引：2，自引：1，他引：2  

周海光  王玉彬 《气象》2003,29(8):13-15

对2002年7月22～23日长江中游的积层混合性暴雨的中尺度三维动力结构进行了双多普勒雷达对比观测分析，表明中低层切变线、中尺度辐合线和中尺度气旋是这次强降水的重要特征；不同反演算法得到的三维动力模型差别较大，必须引起重视。  相似文献   

CINRAD/SA雷达日常维护及故障诊断方法   总被引：17，自引：6，他引：17  

胡东明  伍志方 《气象》2003,29(10):26-28

CINRAD雷达系统，具有完善的自动定标系统和可靠的故障自诊断系统，利用其“故障报警信息”和“RDA性能参数”，能够完成该雷达系统的日常维护任务；参照“RDA适配数据”，再配合简单的测量工具，可以实现故障的隔离和定位。  相似文献   

基于多普勒雷达传输线路的综合探测业务宽带传输网络系统   总被引：1，自引：3，他引：1       下载免费PDF全文

李芬 《气象科技》2003,31(5):293-295

充分利用多普勒雷达通信资源，综合通信、网络技术，通过建立观测站局域网系统、改造光缆连接方式以及对雷达计算机系统进行技术改造等技术措施，在未增加线路投入及未影响雷达数据通信情况下建立综合探测业务宽带网络传输系统，通信环境得到了很大的改善，报文传输稳定、方便、快捷。  相似文献   

两种中层大气测风雷达探测原理简介   总被引：2，自引：0，他引：2  

张培昌 《山东气象》2003,23(4):1-4

介绍了中频测风雷达和非相干固态激光测风雷达探测60～100km高度内中层大气风场时产生回波的机制、测风的基本原理，以及雷达系统的组成情况。测定该高度内的风场对于发射人造卫星、航天器和洲际导弹等均有重要的意义，也是作空间天气预报的重要气象参数。  相似文献   

单多普勒天气雷达的中尺度风场探测技术研究   总被引：16，自引：11，他引：16       下载免费PDF全文

王峰云  王燕雄  陶祖钰 《热带气象学报》2003,19(3):291-298

利用1998年6月海峡两岸暴雨试验中收集的香港天文台的多普勒雷达资料、GMS—5红外卫星云图等资料对1998年6月9日00～11UTC的暴雨过程进行综合对比分析。分析结果表明：UW方法反演的低空风场中的中尺度流场系统的位置、移动和生消变化与雷达回波的分布及时间演变完全配合，并且与红外卫星云图有良好的对应，因此可以认为，利用UW方法能够从多普勒速度场反演出风场中的中—β以上尺度的切变线系统，为强对流天气的临近预报提供高效、实用的预警产品。  相似文献