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Closing the Global ...
Closing the Global Marine Ra-226 Budget Reveals the Biological Pump as a Dominant Removal Flux in the Upper Ocean
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Xu, B. C. (author)
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Cardenas, M. B. (author)
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- Santos, Isaac R. (author)
- Gothenburg University,Göteborgs universitet,Institutionen för marina vetenskaper,Department of marine sciences
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Burnett, W. C. (author)
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Charette, M. A. (author)
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Rodellas, V. (author)
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Li, S. Z. (author)
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Lian, E. G. (author)
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Yu, Z. G. (author)
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(creator_code:org_t)
- 2022-06-16
- 2022
- English.
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In: Geophysical Research Letters. - : American Geophysical Union (AGU). - 0094-8276 .- 1944-8007. ; 49:12
- Related links:
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https://gup.ub.gu.se...
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https://doi.org/10.1...
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Abstract
Subject headings
Close
- Radium isotopes are powerful proxies in oceanography and hydrology. Radium mass balance models, including assessments of submarine groundwater discharge (SGD), often overlook particle scavenging (PS) as a pathway for dissolved radium removal from the world ocean. Here, we build a global ocean Ra-226 mass balance model and reevaluate the potential importance of PS. We find that PS is the major Ra-226 sink for the upper ocean, removing about 96% of the total input from various sources. Aside from vertical exchange with the lower ocean, SGD is the largest Ra-226 source into the upper ocean. The biological pump transfers particles to the deep ocean, resulting in a major but often overlooked impact on the global Ra-226 marine budget. Our findings suggest that radium mass balance models should consider PS in systems with high siliceous algae production and export fluxes and long water residence times to prevent underestimation of large-scale SGD fluxes.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geologi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geology (hsv//eng)
Keyword
- particle scavenging
- submarine groundwater discharge
- siliceous algae
- global ocean
- submarine groundwater discharge
- radium isotopes
- biogenic silica
- thorium isotopes
- antarctic ocean
- nutrient fluxes
- coastal waters
- residence time
- mixing zones
- river water
- Geology
Publication and Content Type
- ref (subject category)
- art (subject category)
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