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Global 3-D Electrical Conductivity Model of the World Ocean and Marine Sediments
Geochemistry, Geophysics, Geosystems ( IF 4.480 ) Pub Date : 2021-09-12 , DOI: 10.1029/2021gc009950
Alexander V. Grayver 1
Affiliation  

This study presents global 3-D electrical conductivity models of the world ocean and marine sediments. Electrical conductivity of the ocean was calculated by invoking the Equation of State of Seawater (TEOS-10) with temperature and salinity data retrieved from the World Ocean Atlas and a series of high-resolution regional ocean climatology data sets. The resolution of the ocean conductivity atlas varies between 0.urn:x-wiley:15252027:media:ggge22631:ggge22631-math-0001 and 0.urn:x-wiley:15252027:media:ggge22631:ggge22631-math-0002 globally. The conductivity of marine sediments was estimated by using compaction and thermal gradient models constrained by real observations on a 5-arc-minute global marine sediment thickness grid. I present numerical simulations of electromagnetic (EM) induction responses that demonstrate a significant effect of 3-D electrical conductivity of the ocean and marine sediments on EM responses for a broad range of frequencies. I show that both marine and land-based surveys designed for subsurface conductivity imaging or Space Weather modeling will benefit from inclusion of more realistic conductivity models of the ocean and seabed sediments.

中文翻译:

世界海洋和海洋沉积物的全球 3-D 电导率模型

本研究展示了世界海洋和海洋沉积物的全球 3-D 电导率模型。海洋的电导率是通过调用海水状态方程 (TEOS-10) 以及从世界海洋地图集和一系列高分辨率区域海洋气候学数据集检索到的温度和盐度数据来计算的。海洋电导率图谱的分辨率在 0.urn:x-wiley:15252027:media:ggge22631:ggge22631-math-0001和0. 之间变化。urn:x-wiley:15252027:media:ggge22631:ggge22631-math-0002全球。海洋沉积物的电导率是通过使用压实和热梯度模型来估计的,这些模型受对 5 弧分全球海洋沉积物厚度网格的实际观察结果的约束。我展示了电磁 (EM) 感应响应的数值模拟,证明了海洋和海洋沉积物的 3-D 电导率对宽范围频率的 EM 响应的显着影响。我表明,为地下电导率成像或空间天气建模而设计的海洋和陆基调查将受益于包含更现实的海洋和海底沉积物电导率模型。
更新日期:2021-09-24
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