The Influence of Natural, Anthropogenic, and Wildfire Sources on Iron and Zinc Aerosols Delivered to the North Pacific Ocean
Abstract Atmospheric deposition is an important source of iron (Fe) and perhaps zinc (Zn) to the oceans. We present total and water‐soluble aerosol Fe and Zn isotopic compositions, size‐fractionated aerosol Fe isotopic compositions, and aerosol enrichment factors from the North Pacific GEOTRACES GP1...
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| Format: | Article |
| Language: | English |
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Wiley
2025-02-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2024GL113877 |
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| author | Z. B. Bunnell M. Sieber D. S. Hamilton C. M. Marsay C. S. Buck W. M. Landing S. G. John T. M. Conway |
| author_facet | Z. B. Bunnell M. Sieber D. S. Hamilton C. M. Marsay C. S. Buck W. M. Landing S. G. John T. M. Conway |
| author_sort | Z. B. Bunnell |
| collection | DOAJ |
| description | Abstract Atmospheric deposition is an important source of iron (Fe) and perhaps zinc (Zn) to the oceans. We present total and water‐soluble aerosol Fe and Zn isotopic compositions, size‐fractionated aerosol Fe isotopic compositions, and aerosol enrichment factors from the North Pacific GEOTRACES GP15 section (Alaska‐Tahiti) during the low dust season. We found distinct bulk aerosol provinces along this latitudinal transect: Asian aerosols (especially crustal dust) dominate at higher latitudes (52–32°N) while North American heavier‐than‐crustal wildfire aerosols dominate in Equatorial Pacific deployments (20°N to 20°S). Soluble aerosol Fe was isotopically lighter‐than‐crustal along the full transect, strongly indicative of a pervasive anthropogenic Fe contribution to the Pacific. Comparison to a global aerosol deposition model corroborates that an isotopically heavy endmember is required for wildfire Fe, attributed to pyroconvective entrainment of soil particles. For Zn, the entire GP15 section is dominated by non‐crustal anthropogenic sources, reflected by light isotopic compositions (bulk: −0.12 ± 0.08‰ and soluble: −0.17 ± 0.14‰). |
| format | Article |
| id | doaj-art-4c0553248ee343db80038d8d064a2a42 |
| institution | DOAJ |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-4c0553248ee343db80038d8d064a2a422025-08-20T02:57:05ZengWileyGeophysical Research Letters0094-82761944-80072025-02-01523n/an/a10.1029/2024GL113877The Influence of Natural, Anthropogenic, and Wildfire Sources on Iron and Zinc Aerosols Delivered to the North Pacific OceanZ. B. Bunnell0M. Sieber1D. S. Hamilton2C. M. Marsay3C. S. Buck4W. M. Landing5S. G. John6T. M. Conway7College of Marine Sciences University of South Florida St Petersburg FL USACollege of Marine Sciences University of South Florida St Petersburg FL USADepartment of Marine, Earth, and Atmospheric Sciences North Carolina State University Raleigh NC USASkidaway Institute of Oceanography University of Georgia Savannah GA USASkidaway Institute of Oceanography University of Georgia Savannah GA USADepartment of Earth, Ocean, and Atmospheric Science Florida State University Saint Petersburg FL USADepartment of Earth Sciences University of California Los Angeles Los Angeles CA USACollege of Marine Sciences University of South Florida St Petersburg FL USAAbstract Atmospheric deposition is an important source of iron (Fe) and perhaps zinc (Zn) to the oceans. We present total and water‐soluble aerosol Fe and Zn isotopic compositions, size‐fractionated aerosol Fe isotopic compositions, and aerosol enrichment factors from the North Pacific GEOTRACES GP15 section (Alaska‐Tahiti) during the low dust season. We found distinct bulk aerosol provinces along this latitudinal transect: Asian aerosols (especially crustal dust) dominate at higher latitudes (52–32°N) while North American heavier‐than‐crustal wildfire aerosols dominate in Equatorial Pacific deployments (20°N to 20°S). Soluble aerosol Fe was isotopically lighter‐than‐crustal along the full transect, strongly indicative of a pervasive anthropogenic Fe contribution to the Pacific. Comparison to a global aerosol deposition model corroborates that an isotopically heavy endmember is required for wildfire Fe, attributed to pyroconvective entrainment of soil particles. For Zn, the entire GP15 section is dominated by non‐crustal anthropogenic sources, reflected by light isotopic compositions (bulk: −0.12 ± 0.08‰ and soluble: −0.17 ± 0.14‰).https://doi.org/10.1029/2024GL113877aerosolsirontrace metalsdustwildfiresGEOTRACES |
| spellingShingle | Z. B. Bunnell M. Sieber D. S. Hamilton C. M. Marsay C. S. Buck W. M. Landing S. G. John T. M. Conway The Influence of Natural, Anthropogenic, and Wildfire Sources on Iron and Zinc Aerosols Delivered to the North Pacific Ocean Geophysical Research Letters aerosols iron trace metals dust wildfires GEOTRACES |
| title | The Influence of Natural, Anthropogenic, and Wildfire Sources on Iron and Zinc Aerosols Delivered to the North Pacific Ocean |
| title_full | The Influence of Natural, Anthropogenic, and Wildfire Sources on Iron and Zinc Aerosols Delivered to the North Pacific Ocean |
| title_fullStr | The Influence of Natural, Anthropogenic, and Wildfire Sources on Iron and Zinc Aerosols Delivered to the North Pacific Ocean |
| title_full_unstemmed | The Influence of Natural, Anthropogenic, and Wildfire Sources on Iron and Zinc Aerosols Delivered to the North Pacific Ocean |
| title_short | The Influence of Natural, Anthropogenic, and Wildfire Sources on Iron and Zinc Aerosols Delivered to the North Pacific Ocean |
| title_sort | influence of natural anthropogenic and wildfire sources on iron and zinc aerosols delivered to the north pacific ocean |
| topic | aerosols iron trace metals dust wildfires GEOTRACES |
| url | https://doi.org/10.1029/2024GL113877 |
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