Ocean dynamics, not dust, have controlled equatorial Pacific productivity over the past 500,000 years
The equatorial Pacific is a key oceanographic region in Earth’s climate system. Biological production in this region is limited, in part, by the lack of the micronutrient iron. Atmospheric dust is a source of iron, as is upwelling of ocean waters from below. A longstanding question has been whether...
Published in: | Proceedings of the National Academy of Sciences |
---|---|
Main Authors: | , , , |
Format: | Text |
Language: | English |
Published: |
National Academy of Sciences
2016
|
Subjects: | |
Online Access: | http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4896667/ http://www.ncbi.nlm.nih.gov/pubmed/27185933 https://doi.org/10.1073/pnas.1600616113 |
id |
ftpubmed:oai:pubmedcentral.nih.gov:4896667 |
---|---|
record_format |
openpolar |
spelling |
ftpubmed:oai:pubmedcentral.nih.gov:4896667 2023-05-15T18:25:14+02:00 Ocean dynamics, not dust, have controlled equatorial Pacific productivity over the past 500,000 years Winckler, Gisela Anderson, Robert F. Jaccard, Samuel L. Marcantonio, Franco 2016-05-31 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4896667/ http://www.ncbi.nlm.nih.gov/pubmed/27185933 https://doi.org/10.1073/pnas.1600616113 en eng National Academy of Sciences http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4896667/ http://www.ncbi.nlm.nih.gov/pubmed/27185933 http://dx.doi.org/10.1073/pnas.1600616113 Physical Sciences Text 2016 ftpubmed https://doi.org/10.1073/pnas.1600616113 2016-12-04T01:18:07Z The equatorial Pacific is a key oceanographic region in Earth’s climate system. Biological production in this region is limited, in part, by the lack of the micronutrient iron. Atmospheric dust is a source of iron, as is upwelling of ocean waters from below. A longstanding question has been whether biological productivity has responded to variable dust supply over ice age cycles. We use geochemical proxies in three sediment cores spanning the breadth of the equatorial Pacific to show that biological productivity did not respond to dustier ice age conditions. Rather than atmospheric iron supply, we infer that ocean dynamics, linking the equatorial Pacific to nutrient supply from the Southern Ocean, played a crucial role in regulating equatorial Pacific productivity. Text Southern Ocean PubMed Central (PMC) Pacific Southern Ocean Proceedings of the National Academy of Sciences 113 22 6119 6124 |
institution |
Open Polar |
collection |
PubMed Central (PMC) |
op_collection_id |
ftpubmed |
language |
English |
topic |
Physical Sciences |
spellingShingle |
Physical Sciences Winckler, Gisela Anderson, Robert F. Jaccard, Samuel L. Marcantonio, Franco Ocean dynamics, not dust, have controlled equatorial Pacific productivity over the past 500,000 years |
topic_facet |
Physical Sciences |
description |
The equatorial Pacific is a key oceanographic region in Earth’s climate system. Biological production in this region is limited, in part, by the lack of the micronutrient iron. Atmospheric dust is a source of iron, as is upwelling of ocean waters from below. A longstanding question has been whether biological productivity has responded to variable dust supply over ice age cycles. We use geochemical proxies in three sediment cores spanning the breadth of the equatorial Pacific to show that biological productivity did not respond to dustier ice age conditions. Rather than atmospheric iron supply, we infer that ocean dynamics, linking the equatorial Pacific to nutrient supply from the Southern Ocean, played a crucial role in regulating equatorial Pacific productivity. |
format |
Text |
author |
Winckler, Gisela Anderson, Robert F. Jaccard, Samuel L. Marcantonio, Franco |
author_facet |
Winckler, Gisela Anderson, Robert F. Jaccard, Samuel L. Marcantonio, Franco |
author_sort |
Winckler, Gisela |
title |
Ocean dynamics, not dust, have controlled equatorial Pacific productivity over the past 500,000 years |
title_short |
Ocean dynamics, not dust, have controlled equatorial Pacific productivity over the past 500,000 years |
title_full |
Ocean dynamics, not dust, have controlled equatorial Pacific productivity over the past 500,000 years |
title_fullStr |
Ocean dynamics, not dust, have controlled equatorial Pacific productivity over the past 500,000 years |
title_full_unstemmed |
Ocean dynamics, not dust, have controlled equatorial Pacific productivity over the past 500,000 years |
title_sort |
ocean dynamics, not dust, have controlled equatorial pacific productivity over the past 500,000 years |
publisher |
National Academy of Sciences |
publishDate |
2016 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4896667/ http://www.ncbi.nlm.nih.gov/pubmed/27185933 https://doi.org/10.1073/pnas.1600616113 |
geographic |
Pacific Southern Ocean |
geographic_facet |
Pacific Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4896667/ http://www.ncbi.nlm.nih.gov/pubmed/27185933 http://dx.doi.org/10.1073/pnas.1600616113 |
op_doi |
https://doi.org/10.1073/pnas.1600616113 |
container_title |
Proceedings of the National Academy of Sciences |
container_volume |
113 |
container_issue |
22 |
container_start_page |
6119 |
op_container_end_page |
6124 |
_version_ |
1766206534060081152 |