MCSs移出青藏高原规律的可视化表达与知识发现  

Visualization and Knowledge Discovery on the Rules of the MCSs Moving out Plateau

作　　者：方兆宝[1,2,3] 林珲[2] 吴立新[1] 江吉喜[4] 黄签[4] 过仲阳[2,5] 

机构地区：[1]中国矿业大学(北京校区),北京100083 [2]香港中文大学中科院地球信息科学联合实验室,中国香港 [3]91561部队,广东广州510320 [4]国家气象局卫星气象中心,北京100081 [5]华东师范大学地理系,上海200062

出　　处：《测绘学院学报》2004年第1期61-65,共5页Journal of Institute of Surveying and Mapping

基　　金：香港特区政府研究资助面目 (CUHK 413 2 /99H)

摘　　要：为了客观揭示青藏高原上中尺度对流系统 (MesoscaleConvectiveSystems,MCSs)的演变规律 ,尤其是它向东移出高原的条件 ,采用卫星红外影像运动目标计算机自动识别与跟踪技术 ,提取了高原上夏季MCSs的大小、强度、生命史、形状及分布等空间特征 ,并将MCSs的空间特征与青藏高原HLAFS资料相关联 ,建立了MCSs时空数据库。运用面向时空数据挖掘的相关分析法、关联规则及决策树法 ,求解MCSs东移传播出高原与其周边环境物理场之间的关系 ,进而建立了 4 0 0hPa和 5 0 0hPa两个层次上影响MCSs移出高原的环境物理场的可视化概略模型图。从模型图中发现 :在 4 0 0hPa上 ,移出高原且方向向东的MCSs主要决定于等压面高度、散度和涡度场 ,等压面高度变化呈南北向 ;而在 5 0 0hPa上 ,等压面高度和K指数场是影响MCSs移出高原的主要因素 ,K指数变化呈西东走势。To open out the external evolvement rules of the MCSs over the Plateau, especially its conditions to move out the Plateau to East, using the technology of the automatic identifying and tracing infrared image targets in a computer ,the features of area, intensity, life cycle, active region and shape of the MCSs are obtained in summer .The features of the MCSs are associated with the High Resolution Limited Area Analysis and the Forecasting System (HLAFS) data, and the correlation analytical method, relationship rules and decision making tree of the spatial data mining oriented are used to seek the relationships between the movement route of MCSs and the physical fields around its center. Consequently, the physical field model charts of influencing MCSs movement are developed on 400 hPa and 500 hPa, respectively. The model charts open out the rules of the MCSs moving out the Plateau, on 400 hPa, the MCS S moving out the Plateau to East are depended on the height (), the vortex (VOR), and the divergent (DIV). And on the 500 hPa, the height and the K index are the main factors that influence the MCS S to move out the Plateau.

关 键 词：青藏高原中尺度对流系统(MCSs) 环境物理场 模型图 可视化 知识发现 

分 类 号：P282[天文地球—地图制图学与地理信息工程]