New experiments suggest Earth's core contains up to 9-45 oceans' worth of hydrogen

Amazing stuff! This estimate presents an unusually huge range! They need to measure this again! 😊

From the abstract:

"Earth’s core has long been speculated to be the largest reservoir of hydrogen (H) on the planet. However, current estimates of its H content involve substantial uncertainties, due to the challenge of quantifying H under extreme conditions.

Here, we perform superliquidus metal-silicate partitioning experiments on H using laser-heated diamond anvil cells, and combine it with atom probe tomography.

The direct observation of H at silicon- and oxygen-rich nanostructures in the iron alloy indicates coupled sequestration of silicon, oxygen and hydrogen into Earth’s core during its formation. With the observed molar Si/H ratio close to unity, Earth’s core is estimated to contain 0.07-0.36 wt.% H, equivalent to 9-45 oceans of water. Such an amount would require the Earth to obtain the majority of its water from the main stages of terrestrial accretion, instead of through comets during late addition."

New experiments suggest Earth's core contains up to 45 oceans' worth of hydrogen

Experimental quantification of hydrogen content in the Earth’s core (open access)

Fig. 4: Metal-silicate partition coefficient of hydrogen inferred from varying H/Si ratios in the metal.