Cordilleran ice-sheet growth fueled primary productivity in the Gulf of Alaska, northeast Pacific Ocean
Accepted manuscript version. Published version available at https://doi.org/10.1130/G39904.1 . 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 cr...
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Geological Society of America
2018
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Online Access: | https://hdl.handle.net/10037/14455 https://doi.org/10.1130/G39904.1 |
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ftunivtroemsoe:oai:munin.uit.no:10037/14455 2023-05-15T16:40:22+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 2018-02-15 https://hdl.handle.net/10037/14455 https://doi.org/10.1130/G39904.1 eng eng Geological Society of America Geology Müller, J., Romero, O., Cowan, E.A., McClymont, E.L., Forwick, M., Asahi, H., . Stoner, J. (2018). Cordilleran ice-sheet growth fueled primary productivity in the Gulf of Alaska, northeast Pacific Ocean. Geology , 46(4), 307-310. https://doi.org/10.1130/G39904.1 FRIDAID 1624850 doi:10.1130/G39904.1 0091-7613 1943-2682 https://hdl.handle.net/10037/14455 openAccess VDP::Mathematics and natural science: 400::Geosciences: 450::Quaternary geology glaciology: 465 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Kvartærgeologi glasiologi: 465 Journal article Tidsskriftartikkel Peer reviewed 2018 ftunivtroemsoe https://doi.org/10.1130/G39904.1 2021-06-25T17:56:19Z Accepted manuscript version. Published version available at https://doi.org/10.1130/G39904.1 . 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 University of Tromsø: Munin Open Research Archive Gulf of Alaska Pacific Southern Ocean Geology 46 4 307 310 |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
VDP::Mathematics and natural science: 400::Geosciences: 450::Quaternary geology glaciology: 465 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Kvartærgeologi glasiologi: 465 |
spellingShingle |
VDP::Mathematics and natural science: 400::Geosciences: 450::Quaternary geology glaciology: 465 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Kvartærgeologi glasiologi: 465 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 |
topic_facet |
VDP::Mathematics and natural science: 400::Geosciences: 450::Quaternary geology glaciology: 465 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Kvartærgeologi glasiologi: 465 |
description |
Accepted manuscript version. Published version available at https://doi.org/10.1130/G39904.1 . 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 |
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 |
https://hdl.handle.net/10037/14455 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_relation |
Geology Müller, J., Romero, O., Cowan, E.A., McClymont, E.L., Forwick, M., Asahi, H., . Stoner, J. (2018). Cordilleran ice-sheet growth fueled primary productivity in the Gulf of Alaska, northeast Pacific Ocean. Geology , 46(4), 307-310. https://doi.org/10.1130/G39904.1 FRIDAID 1624850 doi:10.1130/G39904.1 0091-7613 1943-2682 https://hdl.handle.net/10037/14455 |
op_rights |
openAccess |
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_ |
1766030759702822912 |