Asian dust-deposition flux to the subarctic Pacific estimated using single quartz particles
Abstract Iron availability limits marine ecosystem activities in large areas of the ocean. However, the sources and seasonal supply of iron, critically important for controlling surface ocean biogeochemistry and carbon cycling, are poorly understood. The western subarctic Pacific is a high-nutrient...
| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2023-09-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-023-41201-6 |
| _version_ | 1797560070018433024 |
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| author | Kana Nagashima Hajime Kawakami Koji Sugie Tetsuichi Fujiki Jun Nishioka Yoko Iwamoto Toshihiko Takemura Takuma Miyakawa Fumikazu Taketani Maki Noguchi Aita |
| author_facet | Kana Nagashima Hajime Kawakami Koji Sugie Tetsuichi Fujiki Jun Nishioka Yoko Iwamoto Toshihiko Takemura Takuma Miyakawa Fumikazu Taketani Maki Noguchi Aita |
| author_sort | Kana Nagashima |
| collection | DOAJ |
| description | Abstract Iron availability limits marine ecosystem activities in large areas of the ocean. However, the sources and seasonal supply of iron, critically important for controlling surface ocean biogeochemistry and carbon cycling, are poorly understood. The western subarctic Pacific is a high-nutrient and low-chlorophyll region, and despite high concentrations of macronutrients, iron limits phytoplankton production in summer. Here, we determine the seasonal deposition flux of Asian dust using scanning electron microscope–cathodoluminescence analysis of single quartz particles derived from the western subarctic Pacific during 2003–2022 to trace provenance. We found a high (up to 6.9 mg m−2 day−1) deposition flux of Asian dust in May, June, and early July, with an annual average of 1.0 ± 0.2 mg m−2 day−1. The supply of dissolved-iron flux calculated from Asian dust was 0.9 ± 0.3 µg m−2 day−1 during the high productivity season (April–July), which is approximately half that from the deeper part of the ocean, calculated from vertical profiles of dissolved iron. Our study provides a reliable approach for estimating iron supply from dust to the surface ocean that may be critical for sustaining biological productivity under future ocean stratification, which suppresses nutrient supply from the subsurface ocean. |
| first_indexed | 2024-03-10T17:54:12Z |
| format | Article |
| id | doaj.art-c470311ab0fd4a8381f04d54191d5b31 |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-03-10T17:54:12Z |
| publishDate | 2023-09-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-c470311ab0fd4a8381f04d54191d5b312023-11-20T09:16:02ZengNature PortfolioScientific Reports2045-23222023-09-0113111010.1038/s41598-023-41201-6Asian dust-deposition flux to the subarctic Pacific estimated using single quartz particlesKana Nagashima0Hajime Kawakami1Koji Sugie2Tetsuichi Fujiki3Jun Nishioka4Yoko Iwamoto5Toshihiko Takemura6Takuma Miyakawa7Fumikazu Taketani8Maki Noguchi Aita9Research Institute for Global Change, Japan Agency for Marine-Earth Science and TechnologyResearch Institute for Value-Added-Information Generation, Japan Agency for Marine-Earth Science and TechnologyResearch Institute for Global Change, Japan Agency for Marine-Earth Science and TechnologyResearch Institute for Global Change, Japan Agency for Marine-Earth Science and TechnologyInstitute of Low Temperature Science, Hokkaido UniversityGraduate School of Integrated Sciences for Life, Hiroshima UniversityResearch Institute for Applied Mechanics, Kyushu UniversityResearch Institute for Global Change, Japan Agency for Marine-Earth Science and TechnologyResearch Institute for Global Change, Japan Agency for Marine-Earth Science and TechnologyResearch Institute for Global Change, Japan Agency for Marine-Earth Science and TechnologyAbstract Iron availability limits marine ecosystem activities in large areas of the ocean. However, the sources and seasonal supply of iron, critically important for controlling surface ocean biogeochemistry and carbon cycling, are poorly understood. The western subarctic Pacific is a high-nutrient and low-chlorophyll region, and despite high concentrations of macronutrients, iron limits phytoplankton production in summer. Here, we determine the seasonal deposition flux of Asian dust using scanning electron microscope–cathodoluminescence analysis of single quartz particles derived from the western subarctic Pacific during 2003–2022 to trace provenance. We found a high (up to 6.9 mg m−2 day−1) deposition flux of Asian dust in May, June, and early July, with an annual average of 1.0 ± 0.2 mg m−2 day−1. The supply of dissolved-iron flux calculated from Asian dust was 0.9 ± 0.3 µg m−2 day−1 during the high productivity season (April–July), which is approximately half that from the deeper part of the ocean, calculated from vertical profiles of dissolved iron. Our study provides a reliable approach for estimating iron supply from dust to the surface ocean that may be critical for sustaining biological productivity under future ocean stratification, which suppresses nutrient supply from the subsurface ocean.https://doi.org/10.1038/s41598-023-41201-6 |
| spellingShingle | Kana Nagashima Hajime Kawakami Koji Sugie Tetsuichi Fujiki Jun Nishioka Yoko Iwamoto Toshihiko Takemura Takuma Miyakawa Fumikazu Taketani Maki Noguchi Aita Asian dust-deposition flux to the subarctic Pacific estimated using single quartz particles Scientific Reports |
| title | Asian dust-deposition flux to the subarctic Pacific estimated using single quartz particles |
| title_full | Asian dust-deposition flux to the subarctic Pacific estimated using single quartz particles |
| title_fullStr | Asian dust-deposition flux to the subarctic Pacific estimated using single quartz particles |
| title_full_unstemmed | Asian dust-deposition flux to the subarctic Pacific estimated using single quartz particles |
| title_short | Asian dust-deposition flux to the subarctic Pacific estimated using single quartz particles |
| title_sort | asian dust deposition flux to the subarctic pacific estimated using single quartz particles |
| url | https://doi.org/10.1038/s41598-023-41201-6 |
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