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Diverse carbonates in exoplanet oceans promote the carbon cycle
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Hakim, Kaustubh, Tian, Meng, Bower, Dan J. and Heng, Kevin (2023) Diverse carbonates in exoplanet oceans promote the carbon cycle. The Astrophysical Journal Letters, 942 (1). L20. doi:10.3847/2041-8213/aca90c ISSN 2041-8205.
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Official URL: http://doi.org/10.3847/2041-8213/aca90c
Abstract
Carbonate precipitation in oceans is essential for the carbonate-silicate cycle (inorganic carbon cycle) to maintain temperate climates. By considering the thermodynamics of carbonate chemistry, we demonstrate that the ocean pH decreases by approximately 0.5 for a factor of 10 increase in the atmospheric carbon dioxide content. The upper and lower limits of ocean pH are within 1–4 of each other, where the upper limit is buffered by carbonate precipitation and defines the ocean pH when the carbon cycle operates. If the carbonate compensation depth (CCD) resides above the ocean floor, then carbonate precipitation and the carbon cycle cease to operate. The CCD is deep (>40 km) for high ocean temperature and high atmospheric carbon dioxide content. Key divalent carbonates of magnesium, calcium and iron produce an increasingly wider parameter space of deep CCDs, suggesting that chemical diversity promotes the carbon cycle. The search for life from exoplanets will benefit by including chemically more diverse targets than Earth twins.
| Item Type: | Journal Article | |||||||||
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| Subjects: | G Geography. Anthropology. Recreation > GC Oceanography Q Science > QB Astronomy Q Science > QH Natural history > QH301 Biology |
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| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||
| Library of Congress Subject Headings (LCSH): | Carbon cycle (Biogeochemistry), Chemical oceanography, Atmospheric carbon dioxide, Extrasolar planets | |||||||||
| Journal or Publication Title: | The Astrophysical Journal Letters | |||||||||
| Publisher: | Institute of Physics Publishing, Inc. | |||||||||
| ISSN: | 2041-8205 | |||||||||
| Official Date: | 5 January 2023 | |||||||||
| Dates: |
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| Volume: | 942 | |||||||||
| Number: | 1 | |||||||||
| Number of Pages: | 8 | |||||||||
| Article Number: | L20 | |||||||||
| DOI: | 10.3847/2041-8213/aca90c | |||||||||
| Status: | Peer Reviewed | |||||||||
| Publication Status: | Published | |||||||||
| Access rights to Published version: | Open Access (Creative Commons) | |||||||||
| Date of first compliant deposit: | 28 February 2023 | |||||||||
| Date of first compliant Open Access: | 28 February 2023 | |||||||||
| RIOXX Funder/Project Grant: |
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