Solar wind contributions to Earth’s oceans
Journal Article
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· Nature Astronomy
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- Univ. of Glasgow, Scotland (United Kingdom); Curtin Univ., Perth, WA (Australia); Univ. of Sydney, NSW (Australia); Univ. of Oxford (United Kingdom)
- Univ. of Glasgow, Scotland (United Kingdom)
- Univ. of Hawaii at Manoa, Honolulu, HI (United States)
- Curtin Univ., Perth, WA (Australia)
- Natural History Museum, London (United Kingdom)
- Idaho National Lab. (INL), Idaho Falls, ID (United States); Lockheed Martin Corp., Palo Alto, CA (United States)
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- NASA Johnson Space Center, Houston, TX (United States)
- Univ. of Virginia, Charlottesville, VA (United States)
- Northern Arizona Univ., Flagstaff, AZ (United States)
- Purdue Univ., West Lafayette, IN (United States)
The isotopic composition of water in Earth’s oceans is challenging to recreate using a plausible mixture of known extraterrestrial sources such as asteroids—an additional isotopically light reservoir is required. The Sun’s solar wind could provide an answer to balance Earth’s water budget. Here, we used atom probe tomography to directly observe an average ~1 mol% enrichment in water and hydroxyls in the solar-wind-irradiated rim of an olivine grain from the S-type asteroid Itokawa. We also experimentally confirm that H+ irradiation of silicate mineral surfaces produces water molecules. These results suggest that the Itokawa regolith could contain ~20 l m-3 of solar-wind-derived water and that such water reservoirs are probably ubiquitous on airless worlds throughout our Galaxy. The production of this isotopically light water reservoir by solar wind implantation into fine-grained silicates may have been a particularly important process in the early Solar System, potentially providing a means to recreate Earth’s current water isotope ratios.
- Research Organization:
- Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Organization:
- Australian Research Council; National Aeronautics and Space Administration (NASA); Science and Industry Endowment Fund; UK STFC consortium; USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- NA0003525
- OSTI ID:
- 1834330
- Report Number(s):
- SAND--2021-8608J; 697171
- Journal Information:
- Nature Astronomy, Journal Name: Nature Astronomy Journal Issue: 12 Vol. 5; ISSN 2397-3366
- Publisher:
- Springer NatureCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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