Anthropogenic Asian aerosols provide Fe to the North Pacific Ocean
© 2020 National Academy of Sciences. All rights reserved. Fossil-fuel emissions may impact phytoplankton primary productivity and carbon cycling by supplying bioavailable Fe to remote areas of the ocean via atmospheric aerosols. However, this pathway has not been confirmed by field observations of a...
| Main Authors: | , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Proceedings of the National Academy of Sciences
2021
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| Online Access: | https://hdl.handle.net/1721.1/133784 |
| _version_ | 1826192370998181888 |
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| author | Pinedo-González, Paulina Hawco, Nicholas J Bundy, Randelle M Armbrust, E Virginia Follows, Michael J Cael, BB White, Angelicque E Ferrón, Sara Karl, David M John, Seth G |
| author_facet | Pinedo-González, Paulina Hawco, Nicholas J Bundy, Randelle M Armbrust, E Virginia Follows, Michael J Cael, BB White, Angelicque E Ferrón, Sara Karl, David M John, Seth G |
| author_sort | Pinedo-González, Paulina |
| collection | MIT |
| description | © 2020 National Academy of Sciences. All rights reserved. Fossil-fuel emissions may impact phytoplankton primary productivity and carbon cycling by supplying bioavailable Fe to remote areas of the ocean via atmospheric aerosols. However, this pathway has not been confirmed by field observations of anthropogenic Fe in seawater. Here we present high-resolution trace-metal concentrations across the North Pacific Ocean (158°W from 25°to 42°N). A dissolved Fe maximum was observed around 35°N, coincident with high dissolved Pb and Pb isotope ratios matching Asian industrial sources and confirming recent aerosol deposition. Iron-stable isotopes reveal in situ evidence of anthropogenic Fe in seawater, with low δ56Fe (−0.23 > δ56Fe > −0.65) observed in the region that is most influenced by aerosol deposition. An isotope mass balance suggests that anthropogenic Fe contributes 21–59% of dissolved Fe measured between 35° and 40°N. Thus, anthropogenic aerosol Fe is likely to be an important Fe source to the North Pacific Ocean. |
| first_indexed | 2024-09-23T09:11:00Z |
| format | Article |
| id | mit-1721.1/133784 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T09:11:00Z |
| publishDate | 2021 |
| publisher | Proceedings of the National Academy of Sciences |
| record_format | dspace |
| spelling | mit-1721.1/1337842021-10-28T04:46:54Z Anthropogenic Asian aerosols provide Fe to the North Pacific Ocean Pinedo-González, Paulina Hawco, Nicholas J Bundy, Randelle M Armbrust, E Virginia Follows, Michael J Cael, BB White, Angelicque E Ferrón, Sara Karl, David M John, Seth G © 2020 National Academy of Sciences. All rights reserved. Fossil-fuel emissions may impact phytoplankton primary productivity and carbon cycling by supplying bioavailable Fe to remote areas of the ocean via atmospheric aerosols. However, this pathway has not been confirmed by field observations of anthropogenic Fe in seawater. Here we present high-resolution trace-metal concentrations across the North Pacific Ocean (158°W from 25°to 42°N). A dissolved Fe maximum was observed around 35°N, coincident with high dissolved Pb and Pb isotope ratios matching Asian industrial sources and confirming recent aerosol deposition. Iron-stable isotopes reveal in situ evidence of anthropogenic Fe in seawater, with low δ56Fe (−0.23 > δ56Fe > −0.65) observed in the region that is most influenced by aerosol deposition. An isotope mass balance suggests that anthropogenic Fe contributes 21–59% of dissolved Fe measured between 35° and 40°N. Thus, anthropogenic aerosol Fe is likely to be an important Fe source to the North Pacific Ocean. 2021-10-27T19:56:39Z 2021-10-27T19:56:39Z 2020 2021-09-16T15:22:13Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/133784 en 10.1073/PNAS.2010315117 Proceedings of the National Academy of Sciences of the United States of America Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf Proceedings of the National Academy of Sciences PNAS |
| spellingShingle | Pinedo-González, Paulina Hawco, Nicholas J Bundy, Randelle M Armbrust, E Virginia Follows, Michael J Cael, BB White, Angelicque E Ferrón, Sara Karl, David M John, Seth G Anthropogenic Asian aerosols provide Fe to the North Pacific Ocean |
| title | Anthropogenic Asian aerosols provide Fe to the North Pacific Ocean |
| title_full | Anthropogenic Asian aerosols provide Fe to the North Pacific Ocean |
| title_fullStr | Anthropogenic Asian aerosols provide Fe to the North Pacific Ocean |
| title_full_unstemmed | Anthropogenic Asian aerosols provide Fe to the North Pacific Ocean |
| title_short | Anthropogenic Asian aerosols provide Fe to the North Pacific Ocean |
| title_sort | anthropogenic asian aerosols provide fe to the north pacific ocean |
| url | https://hdl.handle.net/1721.1/133784 |
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