Cordilleran ice-sheet growth fueled primary productivity in the Gulf of Alaska, northeast Pacific Ocean.
Fertilization of the ocean by eolian dust and icebergs is an effective mechanism to enhance primary productivity. In particular, high-nutrient, low-chlorophyll (HNLC) areas where phytoplankton growth is critically iron-limited, such as the subarctic Pacific Ocean and the Southern Ocean, are proposed...
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Geological Society of America
2018
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Online Access: | http://dro.dur.ac.uk/27615/ http://dro.dur.ac.uk/27615/1/27615.pdf https://doi.org/10.1130/G39904.1 |
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ftunivdurham:oai:dro.dur.ac.uk.OAI2:27615 2023-05-15T16:40:17+02:00 Cordilleran ice-sheet growth fueled primary productivity in the Gulf of Alaska, northeast Pacific Ocean. Müller, Juliane Romero, Oscar Cowan, Ellen A. McClymont, Erin L. Forwick, Matthias Asahi, Hirofumi März, Christian Moy, Christopher M. Suto, Itsuki Mix, Alan Stoner, Joseph 2018-04-01 application/pdf http://dro.dur.ac.uk/27615/ http://dro.dur.ac.uk/27615/1/27615.pdf https://doi.org/10.1130/G39904.1 unknown Geological Society of America dro:27615 issn:0091-7613 doi:10.1130/G39904.1 http://dro.dur.ac.uk/27615/ https://doi.org/10.1130/G39904.1 http://dro.dur.ac.uk/27615/1/27615.pdf Geology, 2018, Vol.46(4), pp.307-310 [Peer Reviewed Journal] Article PeerReviewed 2018 ftunivdurham https://doi.org/10.1130/G39904.1 2020-06-04T22:25:24Z Fertilization of the ocean by eolian dust and icebergs is an effective mechanism to enhance primary productivity. In particular, high-nutrient, low-chlorophyll (HNLC) areas where phytoplankton growth is critically iron-limited, such as the subarctic Pacific Ocean and the Southern Ocean, are proposed to respond to increases in bioavailable Fe supply with enhanced phytoplankton productivity and carbon export to the seafloor. While Fe-fertilization from dust is widely acknowledged to explain a higher export production during glacial periods in the Southern Ocean, paleoceanographic records supporting links between productivity and eolian dust and/or icebergs in the North Pacific are scarce. By combining independent proxies indicative of ice-sheet dynamics and ocean productivity from a single marine sedimentary record (Integrated Ocean Drilling Program [IODP] Site U1417), we present a comprehensive data set of phytoplankton response to different fertilization mechanisms in the subarctic northeast Pacific between 1.5 and 0.5 Ma, including the Mid Pleistocene Transition. Importantly, the timing of the fertilization events is more strongly controlled by local ice-sheet extent than by glacial-interglacial climate variability. Our findings indicate that fertilization by glacigenic debris results in productivity events in HNLC areas adjacent to ice sheets, and that this mechanism may represent an important, yet rarely considered, driver of phytoplankton growth. Article in Journal/Newspaper Ice Sheet Southern Ocean Subarctic Alaska Durham University: Durham Research Online Gulf of Alaska Pacific Southern Ocean Geology 46 4 307 310 |
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Durham University: Durham Research Online |
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ftunivdurham |
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unknown |
description |
Fertilization of the ocean by eolian dust and icebergs is an effective mechanism to enhance primary productivity. In particular, high-nutrient, low-chlorophyll (HNLC) areas where phytoplankton growth is critically iron-limited, such as the subarctic Pacific Ocean and the Southern Ocean, are proposed to respond to increases in bioavailable Fe supply with enhanced phytoplankton productivity and carbon export to the seafloor. While Fe-fertilization from dust is widely acknowledged to explain a higher export production during glacial periods in the Southern Ocean, paleoceanographic records supporting links between productivity and eolian dust and/or icebergs in the North Pacific are scarce. By combining independent proxies indicative of ice-sheet dynamics and ocean productivity from a single marine sedimentary record (Integrated Ocean Drilling Program [IODP] Site U1417), we present a comprehensive data set of phytoplankton response to different fertilization mechanisms in the subarctic northeast Pacific between 1.5 and 0.5 Ma, including the Mid Pleistocene Transition. Importantly, the timing of the fertilization events is more strongly controlled by local ice-sheet extent than by glacial-interglacial climate variability. Our findings indicate that fertilization by glacigenic debris results in productivity events in HNLC areas adjacent to ice sheets, and that this mechanism may represent an important, yet rarely considered, driver of phytoplankton growth. |
format |
Article in Journal/Newspaper |
author |
Müller, Juliane Romero, Oscar Cowan, Ellen A. McClymont, Erin L. Forwick, Matthias Asahi, Hirofumi März, Christian Moy, Christopher M. Suto, Itsuki Mix, Alan Stoner, Joseph |
spellingShingle |
Müller, Juliane Romero, Oscar Cowan, Ellen A. McClymont, Erin L. Forwick, Matthias Asahi, Hirofumi März, Christian Moy, Christopher M. Suto, Itsuki Mix, Alan Stoner, Joseph Cordilleran ice-sheet growth fueled primary productivity in the Gulf of Alaska, northeast Pacific Ocean. |
author_facet |
Müller, Juliane Romero, Oscar Cowan, Ellen A. McClymont, Erin L. Forwick, Matthias Asahi, Hirofumi März, Christian Moy, Christopher M. Suto, Itsuki Mix, Alan Stoner, Joseph |
author_sort |
Müller, Juliane |
title |
Cordilleran ice-sheet growth fueled primary productivity in the Gulf of Alaska, northeast Pacific Ocean. |
title_short |
Cordilleran ice-sheet growth fueled primary productivity in the Gulf of Alaska, northeast Pacific Ocean. |
title_full |
Cordilleran ice-sheet growth fueled primary productivity in the Gulf of Alaska, northeast Pacific Ocean. |
title_fullStr |
Cordilleran ice-sheet growth fueled primary productivity in the Gulf of Alaska, northeast Pacific Ocean. |
title_full_unstemmed |
Cordilleran ice-sheet growth fueled primary productivity in the Gulf of Alaska, northeast Pacific Ocean. |
title_sort |
cordilleran ice-sheet growth fueled primary productivity in the gulf of alaska, northeast pacific ocean. |
publisher |
Geological Society of America |
publishDate |
2018 |
url |
http://dro.dur.ac.uk/27615/ http://dro.dur.ac.uk/27615/1/27615.pdf https://doi.org/10.1130/G39904.1 |
geographic |
Gulf of Alaska Pacific Southern Ocean |
geographic_facet |
Gulf of Alaska Pacific Southern Ocean |
genre |
Ice Sheet Southern Ocean Subarctic Alaska |
genre_facet |
Ice Sheet Southern Ocean Subarctic Alaska |
op_source |
Geology, 2018, Vol.46(4), pp.307-310 [Peer Reviewed Journal] |
op_relation |
dro:27615 issn:0091-7613 doi:10.1130/G39904.1 http://dro.dur.ac.uk/27615/ https://doi.org/10.1130/G39904.1 http://dro.dur.ac.uk/27615/1/27615.pdf |
op_doi |
https://doi.org/10.1130/G39904.1 |
container_title |
Geology |
container_volume |
46 |
container_issue |
4 |
container_start_page |
307 |
op_container_end_page |
310 |
_version_ |
1766030675161382912 |