Characteristics of the Asymmetric Flow of Tropical Cyclone Shanshan (2006) During Its Turning and Intensification Period

In this paper,characteristics of the asymmetric flow of Tropical Cyclone (TC) Shanshan (2006) during its turning and intensification period over the oceanic area east of Taiwan are investigated,based o...     

CINRAD/SA雷达两种识别跟踪产品的评估分析

以中国气象局气象探测中心提供的2007--2008年灾害性天气个例档案为基础,对CINRAD／SA雷达风暴识别跟踪和中气旋产品做了定量评估,同时就评估结果与美国同类产品做了对比。结果表明,风暴识别与跟踪产品基本能满足临近预报的需要,但存在漏识别和错误跟踪现象,且30min以后单体位置预报误差较大。中气旋产品评估结果与美国产品差异不大,基本能自动识别风暴涡旋,但存在漏报,且虚警率较高。     

A numerical method of combined SPF-MEM-LBM on the rockfall-induced surge and its application

Rockfalls in reservoirs are prone to induce surges,posing a severe threat to passing vessels and facilities.A scheme combined Single-phase free-surface method (...     

Skyline三维地籍房籍管理系统的设计

三维GIS具有多维信息处理、表达和分析的特点,可以为地籍与房籍管理和决策提供强有力的GIS支持。简要介绍Skyline系列软件各部分的主要功能,分析基于Skyline开发三维GIS的前提,即数据的生产和发布。结合Skyline三维地籍房籍管理系统的设计,着重叙述三维操作、图层管理、三维查询、决策分析等关键功能的实现过程。     

浅谈地图模型雕刻技术

借助传统的雕刻技术和计算机雕刻软件,在雕刻软件中利用带高程的等高线数据进行地形建模,并通过输出雕刻指令控制雕刻机进行地形模型粗胚的雕刻;然后通过选材进行其他地图要素的雕刻;最后进行整饰,制作完成一幅按一定比例尺缩小的与实地相似的地形图。     

GPS控制网多方案平差比较研究

GPS测量以其全天候、高精度、自动化、高效益等特点,已逐步取代了最初的常规大地测量和工程测量。文章以某大学新校区首级控制网为例,在Pinnacle软件的支持下用三种方案对控制网进行了平差,得出了各测站点的坐标。研究与分析结果表明：采用战役模式的基线解算方案,平差精度最高,其结果为控制网的最终优选结果,可应用于该大学新校区的后期规划与建设。     

一种台风过程雨量的相似预报方法

提出一个台风过程雨量的定点、定量预报方法。方法应用台风初始参数、历史过程的天气形势场和物理量场及数值预报产品,构造预报区域内当前时刻至未来时刻环境要素场的多元客观相似判据。通过定义非线性的相似指数,综合评估历史台风样本与预报台风在多元判据下的连续动态相似程度,以此找到相似样本。应用相似样本的历史雨量记录进行相似指数的权重综合,得到台风未来雨量的定点、定量预报值。预报试验表明该方法具有一定的预报技巧。     

The Development of a Nonhydrostatic Global Spectral Model

With the development of numerical weather prediction technology,the traditional global hydrostatic models used in many countries of the world for operational weather forecasting and numerical simulations of general circulation have become more and more unfit for high-impact weather prediction.To address this,it is important to invest in the development of global nonhydrostatic models.Few existing nonhydrostatic global models use consistently the grid finite difference scheme for the primitive equations of dynamical cores,which can subsequently degrade the accuracy of the calculations.A new nonhydrostatic global spectral model,which utilizes the Eulerian spectral method,is developed here from NCAR Community Atmosphere Model 3.0(CAM3.0).Using Janjic's hydrostatic/nonhydrostatic method,a global nonhydrostatic spectral method for the primitive equations has been formulated and developed.In order to retain the integrity of the nonhydrostatic equations,the atmospheric curvature correction and eccentricity correction are considered. In this paper,the Held-Suarez idealized test and an idealized baroclinic wave test are first carried out,which shows that the nonhydrostatic global spectral model has similar climate states to the results of many other global models for long-term idealized integration,as well as better simulation ability for short-term idealized integration.Then,a real case experiment is conducted using the new dynamical core with the full physical parameterizations of subgrid-scale physical processes.The 10-day numerical integration indicates a decrease in systematic error and a better simulation of zonal wind,temperature,and 500-hPa height.     

IMPROVEMENT OF NUMERICAL SIMULATION OF TYPHOON RANANIM (0414) BY USING DOPPLER RADAR DATA

Typhoon Rananim (0414) has been simulated by using the non-hydrostatic Advanced Regional Prediction System (ARPS) from Center of Analysis and Prediction of Storms (CAPS). The prediction of Rananim has generally been improved with ARPS using the new generation CINRAD Doppler radar data. Numerical experiments with or without using the radar data have shown that model initial fields with the assimilated radar radial velocity data in ARPS can change the wind field at the middle and high levels of the troposphere; fine characteristics of the tropical cyclone (TC) are introduced into the initial wind, the x component of wind speed south of the TC is increased and so is the y component west of it. They lead to improved forecasting of TC tracks for the time after landfall. The field of water vapor mixing ratio, temperature, cloud water mixing ratio and rainwater mixing ratio have also been improved by using radar reflectivity data. The model’s initial response to the introduction of hydrometeors has been increased. It is shown that horizontal model resolution has a significant impact on intensity forecasts, by greatly improving the forecasting of TC rainfall, and heavy rainstorm of the TC specially, as well as its distribution and variation with time.