Global 3-D Electrical Conductivity Model of the World Ocean and Marine Sediments
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Date
2021-09
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Journal Article
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yes
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Abstract
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.
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published
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22 (9)
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Wiley
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03734 - Jackson, Andrew / Jackson, Andrew