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| 地磁日变改正中磁湾磁钩等磁扰对海洋磁力资料的影响 |
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任相宇1,2,3, 付永涛1,2,4, 周章国1,2
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1.中国科学院海洋研究所, 山东 青岛 266071;2.中国科学院海洋地质与环境重点实验室, 山东 青岛 266071;3.中国科学院大学, 北京 100049;4.海洋油气勘探国家工程研究中心, 北京 100028
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| 摘要: |
| 在海洋磁力测量过程中,磁扰形态变化复杂的特性致使地磁日变的改正仍存在着许多困难。本文根据黄海、东海和南海北部十余年采集的超过104 km的海洋和陆地地磁资料,利用对比分析的方法,总结了3种磁扰现象对海洋磁力资料的影响规律:1)微扰的海陆日变值持续时间短,幅度比值接近1∶ 1,对海洋磁力资料影响很小,利用低通滤波可以完全消除其影响;2)磁钩海陆日变幅值比为1~2,持续时间在1 h以内,校正后的地磁异常值仍有较大的误差,利用最小曲率法可以基本消除其影响;3)磁湾的持续时间长,海陆日变幅值变化大,无法准确消除其影响,采用最小曲率法等插值方法处理后,仍残留假异常,需要额外关注。 |
| 关键词: 磁湾 磁钩 日变改正 海洋磁力测量 |
| DOI：10.11759/hykx20210428002 |
| 分类号:P631.2+24 |
| 基金项目:中国科学院海洋地质与环境重点实验室开放基金项目(MGE2022KG11) |
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| Influence of magnetic crochet and magnetic bay on ocean magnetic data |
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REN Xiang-yu1,2,3, FU Yong-tao1,2,4, ZHOU Zhang-guo1,2
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1.Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;2.Key Laboratory of Marine Geology and Environmental, Chinese Academy of Sciences, Qingdao 266071, China;3.University of Chinese Academy of Sciences, Beijing 100049, China;4.National Engineering Research Center of Offshore Oil and Gas Explonition, Beijing 100028, China
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| Abstract: |
| In the process of ocean magnetic measurement, many difficulties remain in correcting the magnetic diurnal variation because of the complex characteristics of magnetic disturbances. In this paper, the comparative analysis method is applied to the ocean and land geomagnetic data collected for more than ten years over 100,000 kilometers in the Yellow Sea, East China Sea, and the northern part of the South China Sea, and the influence of three types of magnetic disturbance phenomena on ocean magnetic data is summarized: (1) The daily variation in the land and sea is brief, and its amplitude ratio is near 1:1, which has little impact on ocean magnetic data. Low-pass filtering can eliminate its impact. (2) The magnetic crochet sea-land-day variation amplitude ratio is 1-2, and the duration is less than one hour. The corrected geomagnetic anomaly still has a large error, and the minimum curvature method can essentially eliminate its influence. (3) The magnetic bay is long-lasting, and the daily variation amplitude of the land and sea changes greatly, and its influence cannot be eliminated accurately. After interpolation methods such as the minimum curvature method, false anomalies still remain, which requires additional attention. |
| Key words: magnetic crochet magnetic bay magnetic diurnal variation marine magnetic survey |