African biomass burning is a substantial source of phosphorus deposition to the Amazon, Tropical Atlantic Ocean, and Southern Ocean
The deposition of phosphorus (P) from African dust is believed to play an important role in bolstering primary productivity in the Amazon Basin and Tropical Atlantic Ocean (TAO), leading to sequestration of carbon dioxide. However, there are few measurements of African dust in South America that can...
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Online Access: | http://www.osti.gov/servlets/purl/1594085 https://www.osti.gov/biblio/1594085 https://doi.org/10.1073/pnas.1906091116 |
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ftosti:oai:osti.gov:1594085 2023-07-30T04:07:03+02:00 African biomass burning is a substantial source of phosphorus deposition to the Amazon, Tropical Atlantic Ocean, and Southern Ocean Barkley, Anne E. Prospero, Joseph M. Mahowald, Natalie Hamilton, Douglas S. Popendorf, Kimberly J. Oehlert, Amanda M. Pourmand, Ali Gatineau, Alexandre Panechou-Pulcherie, Kathy Blackwelder, Patricia Gaston, Cassandra J. 2023-06-30 application/pdf http://www.osti.gov/servlets/purl/1594085 https://www.osti.gov/biblio/1594085 https://doi.org/10.1073/pnas.1906091116 unknown http://www.osti.gov/servlets/purl/1594085 https://www.osti.gov/biblio/1594085 https://doi.org/10.1073/pnas.1906091116 doi:10.1073/pnas.1906091116 54 ENVIRONMENTAL SCIENCES 2023 ftosti https://doi.org/10.1073/pnas.1906091116 2023-07-11T09:39:14Z The deposition of phosphorus (P) from African dust is believed to play an important role in bolstering primary productivity in the Amazon Basin and Tropical Atlantic Ocean (TAO), leading to sequestration of carbon dioxide. However, there are few measurements of African dust in South America that can robustly test this hypothesis and even fewer measurements of soluble P, which is readily available for stimulating primary production in the ocean. To test this hypothesis, we measured total and soluble P in long-range transported aerosols collected in Cayenne, French Guiana, a TAO coastal site located at the northeastern edge of the Amazon. Our measurements confirm that in boreal spring when African dust transport is greatest, dust supplies the majority of P, of which 5% is soluble. In boreal fall, when dust transport is at an annual minimum, we measured unexpectedly high concentrations of soluble P, which we show is associated with the transport of biomass burning (BB) from southern Africa. Integrating our results into a chemical transport model, we show that African BB supplies up to half of the P deposited annually to the Amazon from transported African aerosol. As such, this observational study links P-rich BB aerosols from Africa to enhanced P deposition in the Amazon. Contrary to current thought, we also show that African BB is a more important source of soluble P than dust to the TAO and oceans in the Southern Hemisphere and may be more important for marine productivity, particularly in boreal summer and fall. Other/Unknown Material Southern Ocean SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Southern Ocean Proceedings of the National Academy of Sciences 116 33 16216 16221 |
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SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
op_collection_id |
ftosti |
language |
unknown |
topic |
54 ENVIRONMENTAL SCIENCES |
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54 ENVIRONMENTAL SCIENCES Barkley, Anne E. Prospero, Joseph M. Mahowald, Natalie Hamilton, Douglas S. Popendorf, Kimberly J. Oehlert, Amanda M. Pourmand, Ali Gatineau, Alexandre Panechou-Pulcherie, Kathy Blackwelder, Patricia Gaston, Cassandra J. African biomass burning is a substantial source of phosphorus deposition to the Amazon, Tropical Atlantic Ocean, and Southern Ocean |
topic_facet |
54 ENVIRONMENTAL SCIENCES |
description |
The deposition of phosphorus (P) from African dust is believed to play an important role in bolstering primary productivity in the Amazon Basin and Tropical Atlantic Ocean (TAO), leading to sequestration of carbon dioxide. However, there are few measurements of African dust in South America that can robustly test this hypothesis and even fewer measurements of soluble P, which is readily available for stimulating primary production in the ocean. To test this hypothesis, we measured total and soluble P in long-range transported aerosols collected in Cayenne, French Guiana, a TAO coastal site located at the northeastern edge of the Amazon. Our measurements confirm that in boreal spring when African dust transport is greatest, dust supplies the majority of P, of which 5% is soluble. In boreal fall, when dust transport is at an annual minimum, we measured unexpectedly high concentrations of soluble P, which we show is associated with the transport of biomass burning (BB) from southern Africa. Integrating our results into a chemical transport model, we show that African BB supplies up to half of the P deposited annually to the Amazon from transported African aerosol. As such, this observational study links P-rich BB aerosols from Africa to enhanced P deposition in the Amazon. Contrary to current thought, we also show that African BB is a more important source of soluble P than dust to the TAO and oceans in the Southern Hemisphere and may be more important for marine productivity, particularly in boreal summer and fall. |
author |
Barkley, Anne E. Prospero, Joseph M. Mahowald, Natalie Hamilton, Douglas S. Popendorf, Kimberly J. Oehlert, Amanda M. Pourmand, Ali Gatineau, Alexandre Panechou-Pulcherie, Kathy Blackwelder, Patricia Gaston, Cassandra J. |
author_facet |
Barkley, Anne E. Prospero, Joseph M. Mahowald, Natalie Hamilton, Douglas S. Popendorf, Kimberly J. Oehlert, Amanda M. Pourmand, Ali Gatineau, Alexandre Panechou-Pulcherie, Kathy Blackwelder, Patricia Gaston, Cassandra J. |
author_sort |
Barkley, Anne E. |
title |
African biomass burning is a substantial source of phosphorus deposition to the Amazon, Tropical Atlantic Ocean, and Southern Ocean |
title_short |
African biomass burning is a substantial source of phosphorus deposition to the Amazon, Tropical Atlantic Ocean, and Southern Ocean |
title_full |
African biomass burning is a substantial source of phosphorus deposition to the Amazon, Tropical Atlantic Ocean, and Southern Ocean |
title_fullStr |
African biomass burning is a substantial source of phosphorus deposition to the Amazon, Tropical Atlantic Ocean, and Southern Ocean |
title_full_unstemmed |
African biomass burning is a substantial source of phosphorus deposition to the Amazon, Tropical Atlantic Ocean, and Southern Ocean |
title_sort |
african biomass burning is a substantial source of phosphorus deposition to the amazon, tropical atlantic ocean, and southern ocean |
publishDate |
2023 |
url |
http://www.osti.gov/servlets/purl/1594085 https://www.osti.gov/biblio/1594085 https://doi.org/10.1073/pnas.1906091116 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
http://www.osti.gov/servlets/purl/1594085 https://www.osti.gov/biblio/1594085 https://doi.org/10.1073/pnas.1906091116 doi:10.1073/pnas.1906091116 |
op_doi |
https://doi.org/10.1073/pnas.1906091116 |
container_title |
Proceedings of the National Academy of Sciences |
container_volume |
116 |
container_issue |
33 |
container_start_page |
16216 |
op_container_end_page |
16221 |
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1772820139203362816 |