DYNAMICAL STUDY OF DIABATIC HEATING INFLUENCE ON RADIAL INHOMOGENEOUS STRUCTURE OF TROPICAL CYCLONE^*          下载免费PDF全文

LEI Xiaotu  CHEN Lianshou 《Acta Meteorologica Sinica》2002,16(1):86-93

Based on the tropical cyclone (TC) asymmetric disturbance as the superposition of the symmetric environmental circulation,the analytical solution of travelling wave is given by using the barotropical nondivergent model with diabatic heating forcing and non-friction in a plane polar coordinate.Then,the TC radial inhomogeneous structure is analyzed on radial/tangential velocity and geopotential height.It is found that the different kinds of structures are influenced by the Coriolis parameter (f),TC intensity (Ω),disturbance circular frequency (ω),and TC angular wavenumber (m).And,the diabatic heating (Q₁) has significant impacts on the radial/tangential velocity distribution shaped like the inner-tight and outer-relaxed.  相似文献   

Searching for water ice on 47171 1999 TC36, 1998 SG35, and 2000 QC243: ESO large program on TNOs and centaurs     

E. Dotto  M.A. Barucci  J. Romon  N. Peixinho  M. Lazzarin 《Icarus》2003,162(2):408-414

Transneptunian objects and Centaurs are supposed to be among the most pristine bodies of the Solar System. To investigate their physical properties and their surface composition, an ESO large program at the Very Large Telescope was carried out. In this paper we present photometric and spectroscopic near-infrared data of two Centaurs (1998 SG35 and 2000 QC243) and one transneptunian object (47171 1999 TC36). For 47171 1999 TC36 and 1998 SG35 visible photometry is also presented. Models of the surface composition of these objects are presented and discussed. By including a small percentage of water ice in our geographical mixtures, we obtain a better agreement with the observations in the H and K bands.  相似文献   

热带气旋进入北部湾后强度增强的环流特征分析     

陈见  高安宁  陈润珍  何慧  钟祥平  赵江洁 《气象研究与应用》2007,28(1):19-24

利用NCEP/NCAR再分析资料,对1949年以来7个进入北部湾后强度突然增强的热带气旋(TC)环流背景特征及物理量场特征进行分析,结果表明,有利TC进入北部湾后强度增强的环流背景是:(1)西太平洋副热带高压稳定加强西伸,(2)热带辐合带北抬至华南沿海活动,(3)西南季风爆发处于活跃期,(4)东风波西移叠加,(5)有适度的弱冷空气侵入;对物理量场的合成分析表明,TC进入北部湾前和进入北部湾后,环流中心附近500hPa涡度变化极小,200hPa高空散度增大,500hPa垂直上升速度增大,850hPa中南半岛水汽输送量增大。  相似文献   

Simulation of Typhoon Muifa using a mesoscale coupled atmosphere–ocean model   总被引：2，自引：0，他引：2  

SUN Minghu  DUAN Yihong  ZHU Jianrong  WU Hui  ZHANG Jin  HUANG Wei 《海洋学报(英文版)》2014,33(11):123-133

A mesoscale coupled atmosphere–ocean model has been developed based on the GRAPES(Global and Regional Assimilation and Prediction System) regional typhoon model(GRAPES_TYM) and ECOM-si(estuary, coast and ocean model(semi-implicit)). Coupling between the typhoon and ocean models was conducted by exchanging wind stress, heat, moisture fluxes, and sea surface temperatures(SSTs) using the coupler OASIS3.0. Numerical prediction experiments were run with and without coupling for the case of Typhoon Muifa in the western North Pacific. To investigate the impact of using more accurate SST information on the simulation of the track and the intensity of Typhoon Muifa, experiments were also conducted using increased SST resolution in the initial condition field of the control test. The results indicate that increasing SST resolution in the initial condition field somewhat improved the intensity forecast, and use of the coupled model improved the intensity forecast significantly, with mean absolute errors in maximum wind speed within 48 and 72 h reduced by 32% and 20%, respectively. Use of the coupled model also resulted in less pronounced over-prediction of the intensity of Typhoon Muifa by the GRAPES_TYM. Moreover, the effects of using the coupled model on the intensity varied throughout the different stages of the development of Muifa owing to changes in the oceanic mixed layer depth. The coupled model had pronounced effects during the later stage of Muifa but had no obvious effects during the earlier stage. The SSTs predicted by the coupled model decreased by about 5–6°C at most after the typhoon passed, in agreement with satellite data. Furthermore, based on analysis on the sea surface heat flux, wet static energy of the boundary layer, atmospheric temperature, and precipitation forecasted by the coupled model and the control test, the simulation results of this coupled atmosphere–ocean model can be considered to reasonably reflect the primary mechanisms underlying the interactions between tropical cyclones and oceans.  相似文献   

自动化全站仪在高层建筑基坑变形监测中的应用     

刘沛 《测绘与空间地理信息》2011,34(3):239-241

在对自动全站仪自由设站观测原理进行认真分析研究后,利用TC 2003高精度自动全站仪的自由设站加极坐标法对某高层建筑的一级基坑进行变形监测,通过监测结果精度分析,验证了自动全站仪在建筑物变形监测中的快速、准确性.  相似文献   

ISO/TC211首批制定的地理信息国际标准剖析--《地理信息国际标准手册》解读   总被引：4，自引：2，他引：2  

刘若梅  蒋景瞳 《地理信息世界》2003,1(5):18-22

ISO／TC211首批研制的20项地理信息国际标准，是一组结构化的、定义、描述和管理地理信息的标准。本文分5方面内容，分别剖析ISO／TC211首批研制的各项标准的适用范围、主要内容、结构或特点等，以帮助读者更好地和容易地理解标准的内涵，从而能更好地吸取其精华，为我所用。  相似文献   

空间互操作框架集成模式分析   总被引：3，自引：1，他引：2  

张书亮  戚海峰  张亦鸣  闾国年 《地球信息科学学报》2006,8(4):88-95

空间互操作已经成为地理信息共享领域研究的重要内容,广义的空间互操作也逐渐成为空间共享技术的代名词。虽着空间互操作研究的深入,空间互操作的模式与方法也逐步多样化起来。本文分别对基于语义空间数据互操作模式,开放式地理数据互操作规范与分布式异构数据库互操作框架,主流GIS平台互操作产品以及ISO/TC211的空间互操作服务体系结构进行分析的基础上,提出了改善各种互操作技术,以提升互操作性能的方法,指出了空间互操作技术框架的发展规律与趋势。从数据转换到开放文件格式,从标准交换格式到应用程序接口,从空间数据库到Web服务的集成,随着时间和互操作技术的发展,互操作的性能也在逐步提升。  相似文献   

2018年西北太平洋台风活动特征和预报难点分析     

吕心艳  许映龙  董林  高拴柱 《气象》2021,(3):359-372

利用1949—2018年中国气象局台风最佳路径、2018年中央气象台的台风路径强度实时预报、ECMWF数值预报以及NCEP逐日高分辨率海温RTG_SST(0.083°×0.083°)等资料,对2018年西北太平洋台风活动的主要特征和预报难点进行了分析。结果表明:2018年台风生成频数偏多,生成源地偏东,南海台风活跃;生成时间集中,盛夏台风异常偏多,台风群发性强,双台风或多台风共存活动频次偏多;台风生命史长,累积气旋能量偏高,超强台风偏多,但整体强度偏弱,较弱台风异常偏多;台风登陆频数和频次偏多,登陆地段偏北,且登陆台风强度明显偏弱。中央气象台24~120 h台风路径预报误差分别为72、124、179、262和388 km,各时效误差较2017年均有减少,特别是长时效路径预报误差明显减少;24~120 h台风强度预报误差分别为3.7、5.1、5.5、6.6和7.1 m·s^-1。由于双台风或多台风之间的相互作用、“鞍型场”等造成路径预报难度大以及多台风之间复杂水汽输送、近海台风强度变化不确定性大等原因,造成强度预报难度大。若采用更多观测资料、进行更深入的台风机理研究以及研发更有效的台风客观预报技术将是突破这些难点的有效途径。  相似文献   

突泉盆地突参1井原油中轻烃和金刚烷地球化学特征及油源启示     

孙鹏  唐友军  李世臻  公繁浩 《地质与资源》2016,25(5):470-475

采用全烃气相色谱、全油气相色谱-质谱技术,研究了突泉盆地突参1井原油的轻烃和金刚烷类化合物特征,剖析其母质类型、沉积环境、成熟度等方面的信息及地质地球化学意义.突参1井原油Pr/Ph=3.17,姥鲛烷优势明显,指示为偏氧化的沉积环境;甲基环己烷指数MCH为46%,环己烷指数CH为25%,3,4DMD在二甲基金刚烷类化合物中占据一定的优势,其相对含量为48%,根据图版所示揭示其母质类型为Ⅱ₂-Ⅲ型;正庚烷指数（IH）为27.6%,异庚烷指数（Ⅱ）为0.33,甲基单金刚烷成熟度指数（IMA）为0.63,二甲基双金刚烷成熟度指数（IMD）为0.38,经公式计算Ro约为1.2%,属于成熟-高成熟阶段.结合前人研究资料,认为突参1井原油来自于中侏罗统万宝组煤系泥岩.  相似文献   

交通路况基态修正模型及其效率分析     

李婷  徐柱  卢彩霞  于冰  李木梓  黄萌萌 《地球信息科学学报》2012,14(6):712-718

 交通路况在时间上和空间上具有连续变化的特征,在时空维度上对交通路况进行高分辨率采样得到的数据,对研究交通路况的时空动态十分有利。但长时间大范围的高分辨率交通路况信息数据量巨大,给数据的组织和管理带来了困难。目前,尚没有一种成熟的时空数据模型对高时空分辨率交通路况数据进行高效(顾及数据存储与访问效率)的组织管理。本文提出一种基于线性参照系统的交通路况基态修正模型。此模型应用基态修正模型的基本思想,在时间维度上对交通路况数据进行无损压缩,又引入动态分段技术和线性参照系统,以路划作为交通路况载体,在空间维度上对交通路况数据进行压缩存储。利用成都市区真实交通路况数据,本文验证了此模型的有效性,比较了6种不同参数下交通路况基态修正模型的存储和访问效率,给出了最佳模型建议。  相似文献