中国地区地磁正常场模型研究  

A Study on Model of Geomagnetic Normal Field of China Region

作　　者：冯彦[1] 安振昌[2] 孙涵[3] 毛飞[4] 

机构地区：[1]南京农业大学资源与环境科学学院,江苏南京210000 [2]中国科学院地质与地球物理研究所,北京100029 [3]国家卫星气象中心遥感应用试验基地/广西气象减灾研究所,广西南宁530022 [4]中国气象科学研究院,北京100081

出　　处：《地球科学进展》2010年第7期723-729,共7页Advances in Earth Science

基　　金：国家高技术研究发展计划课题研究专项"室内水下地磁定位导航技术研究"(编号:2007AA12Z328)资助

摘　　要：基于2000年中国地区的实测地磁3分量数据,分别选用Taylor模型和第四代地磁场综合模型——CM4计算并绘制出正常场分布图。由于2种正常场分布较为相似,为了进一步比较研究,分别将实测值减去2种正常场模型值以得到2种磁异常值,并利用曲面Spline模型绘制各地磁分量磁异常图,结果显示:2种异常图分布基本一致,以CM4模型作为正常场与国界外的地磁分布结合得较好,适合进行大尺度的磁场研究,计算的磁异常分布在国内以负异常为主;以Taylor模型作为正常场适合进行局部区域的磁场研究,获得的磁异常图正负分布较为均匀、合理。Based on three components survey data of China in 2000,two kinds of normal field,main field model of CM4 and Taylor polynomial model,were chosen to calculate and draw the distribution plots of normal field. Due to the high similarity between the two kinds of normal field and in order to make more precise comparative analysis of them,two kinds of anomaly values were correspondingly calculated by using the two models. Moreover,the Surface Spline model was selected to draw anomaly plots of each component. Results showed that the distribution of the two kinds of the normal field is very similar. The normal field made by CM4 has a good coincidence with the distribution outside the boundary,which is suit for the study of the geomagnetic anomaly on large scale. Nevertheless,the negative values dominate in most regions of China; On the contrary,the normal field made by Taylor model is suit for the study of the regional geomagnetic anomaly,the distribution of positive and negative values is comparatively uniform and reasonable in the mainland.

关 键 词：CM4 正常场 曲面Spline 

分 类 号：P318.1[天文地球—固体地球物理学] P318.2[天文地球—地球物理学]