Closing the Global Marine 226Ra Budget Reveals the Biological Pump as a Dominant Removal Flux in the Upper Ocean
Abstract 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 oce...
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| Format: | Article |
| Language: | English |
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Wiley
2022-06-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2022GL098087 |
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| author | Bochao Xu M. Bayani Cardenas Isaac R. Santos William C. Burnett Matthew A. Charette Valentí Rodellas Sanzhong Li Ergang Lian Zhigang Yu |
| author_facet | Bochao Xu M. Bayani Cardenas Isaac R. Santos William C. Burnett Matthew A. Charette Valentí Rodellas Sanzhong Li Ergang Lian Zhigang Yu |
| author_sort | Bochao Xu |
| collection | DOAJ |
| description | Abstract 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 226Ra mass balance model and reevaluate the potential importance of PS. We find that PS is the major 226Ra 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 226Ra 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 226Ra 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. |
| format | Article |
| id | doaj-art-03c8d91970d94c35929e4c26c38ec1d6 |
| institution | Kabale University |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2022-06-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-03c8d91970d94c35929e4c26c38ec1d62025-01-22T14:38:16ZengWileyGeophysical Research Letters0094-82761944-80072022-06-014912n/an/a10.1029/2022GL098087Closing the Global Marine 226Ra Budget Reveals the Biological Pump as a Dominant Removal Flux in the Upper OceanBochao Xu0M. Bayani Cardenas1Isaac R. Santos2William C. Burnett3Matthew A. Charette4Valentí Rodellas5Sanzhong Li6Ergang Lian7Zhigang Yu8Frontiers Science Center for Deep Ocean Multispheres and Earth System Key Laboratory of Marine Chemistry Theory and Technology Ministry of Education Ocean University of China Qingdao ChinaDepartment of Geological Sciences Jackson School of Geosciences The University of Texas at Austin Austin TX USADepartment of Marine Sciences University of Gothenburg Gothenburg SwedenDepartment of Earth, Ocean and Atmospheric Science Florida State University Tallahassee FL USADepartment of Marine Chemistry and Geochemistry Woods Hole Oceanographic Institution Woods Hole MA USAInstitut de Ciència I Tecnologia Ambientals (ICTA) Universitat Autònoma de Barcelona Catalonia SpainFrontiers Science Center for Deep Ocean Multispheres and Earth System Key Lab of Submarine Geosciences and Prospecting Techniques Ministry of Education College of Marine Geosciences Ocean University of China Qingdao ChinaState Key Laboratory of Marine Geology Tongji University Shanghai ChinaFrontiers Science Center for Deep Ocean Multispheres and Earth System Key Laboratory of Marine Chemistry Theory and Technology Ministry of Education Ocean University of China Qingdao ChinaAbstract 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 226Ra mass balance model and reevaluate the potential importance of PS. We find that PS is the major 226Ra 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 226Ra 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 226Ra 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.https://doi.org/10.1029/2022GL098087particle scavengingsubmarine groundwater dischargesiliceous algaeglobal ocean |
| spellingShingle | Bochao Xu M. Bayani Cardenas Isaac R. Santos William C. Burnett Matthew A. Charette Valentí Rodellas Sanzhong Li Ergang Lian Zhigang Yu Closing the Global Marine 226Ra Budget Reveals the Biological Pump as a Dominant Removal Flux in the Upper Ocean Geophysical Research Letters particle scavenging submarine groundwater discharge siliceous algae global ocean |
| title | Closing the Global Marine 226Ra Budget Reveals the Biological Pump as a Dominant Removal Flux in the Upper Ocean |
| title_full | Closing the Global Marine 226Ra Budget Reveals the Biological Pump as a Dominant Removal Flux in the Upper Ocean |
| title_fullStr | Closing the Global Marine 226Ra Budget Reveals the Biological Pump as a Dominant Removal Flux in the Upper Ocean |
| title_full_unstemmed | Closing the Global Marine 226Ra Budget Reveals the Biological Pump as a Dominant Removal Flux in the Upper Ocean |
| title_short | Closing the Global Marine 226Ra Budget Reveals the Biological Pump as a Dominant Removal Flux in the Upper Ocean |
| title_sort | closing the global marine 226ra budget reveals the biological pump as a dominant removal flux in the upper ocean |
| topic | particle scavenging submarine groundwater discharge siliceous algae global ocean |
| url | https://doi.org/10.1029/2022GL098087 |
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