首页|中国及邻区高分辨率三维岩石圈磁场修正球冠谐模型(CUG_CLMFM3Dv1)

中国及邻区高分辨率三维岩石圈磁场修正球冠谐模型(CUG_CLMFM3Dv1)

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日益完善的大区域地面航磁调查与卫星磁测给建立高精度与高分辨率的地磁场模型带来了新的契机,同时也对地磁场建模技术提出了更高的要求.本文基于修正球冠谐分析方法,利用全球岩石圈磁力异常汇编网格WDMAMv2中提取的近地表总磁场强度异常数据与CHAMP卫星近十年的矢量测量数据,联合构建了中国及邻区高分辨率三维岩石圈磁场的修正球冠谐模型.该区域岩石圈磁场模型的分辨率可达球谐3500阶/次,进而基于该模型正演计算了研究区域不同高度的矢量数据.将区域模型与高分辨率的球谐模型分别在空间域与频率域进行对比,结果显示区域模型中的高频成份更加丰富,所描绘出的磁异常的形态和幅值更加接近原始建模数据,且在由低分辨率球谐模型补空的区域更加平滑.该应用案例证明,联合可靠的近地面标量与卫星矢量磁测数据,基于修正球冠谐分析方法,有能力构建出高精度与高分辨率的区域三维岩石圈磁场模型.
CUG_CLMFM3Dv1:a high-resolution revised spherical cap harmonic model of three-dimensional lithospheric magnetic field over China and surroundings
Improvements in aerial magnetic surveys covering large regions and the increasing number of satellite magnetic missions have created new opportunities for modelling the lithospheric magnetic field with higher resolution and accuracy.These developments have also raised the requirements for geomagnetic field modelling techniques.In this paper,we present a high-resolution revised spherical cap harmonic model of the three-dimensional(3D)lithospheric magnetic field over China and its surrounding areas.Based on the revised spherical cap harmonic analysis(R-SCHA)method,we built our regional model by jointly using the total magnetic intensity anomaly data from the globally compiled lithospheric magnetic anomaly grid(WMDAMv2)and ten years of geomagnetic vector data from the CHAMP satellite mission.The constructed R-SCHA model has a resolution up to spherical harmonic degree and order of 3500,and was used to predict the vector data sets at various altitudes by forward calculation.When compared to high-resolution spherical harmonic models from spatial and wavelength aspects,our results show that the regional model captures richer high-frequency components,and the shape as well as the amplitude of the anomalies presented by the regional model more closely fit the original modelling data.Furthermore,the regional model exhibits smoother variations in the terrestrial data gaps previously padded by the low-resolution spherical harmonic model.Our application case demonstrates that,with the revised spherical cap harmonic analysis method and reliable modelling data sets consisting by the terrestrial scaler and satellite vector data,it is feasible to construct a 3D regional lithospheric magnetic model with a high resolution and accuracy.

Revised spherical cap harmonic analysisLithospheric magnetic fieldHigh resolutionThree-dimensional modelChina and surroundings

张攀、杜劲松、李厚朴

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中国地质大学(武汉)地球物理与空间信息学院,地球内部多尺度成像湖北省重点实验室,武汉 430074

地质过程与矿产资源国家重点实验室,中国地质大学(武汉),武汉 430074

海军工程大学电气工程学院,武汉 430043

修正球冠谐分析 岩石圈磁场 高分辨率 三维模型 中国及邻区

国家优秀青年科学基金国家自然科学基金面上项目地质过程与矿产资源国家重点实验室科技部专项

4212202542174090MSFGPMR2022-4

2024

10.6038/cjg2023Q0856

地球物理学报
中国地球物理学会 中国科学院地质与地球物理研究所

地球物理学报

CSTPCD北大核心
影响因子：3.703
ISSN：0001-5733
年,卷(期)：2024.67(5)
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