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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The Geological Society of America
2018
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Online Access: | https://epic.awi.de/id/eprint/47104/ https://doi.org/10.1130/G39904.1 https://hdl.handle.net/10013/epic.5af342c3-e50f-4c64-92c6-8a5f392372d2 |
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ftawi:oai:epic.awi.de:47104 2024-09-15T18:12:14+00:00 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 https://epic.awi.de/id/eprint/47104/ https://doi.org/10.1130/G39904.1 https://hdl.handle.net/10013/epic.5af342c3-e50f-4c64-92c6-8a5f392372d2 unknown The Geological Society of America Müller, J. orcid:0000-0003-0724-4131 , Romero, O. , Cowan, E. A. , McClymont, E. L. , Forwick, M. , Asahi, H. , März, C. , Moy, C. M. , Suto, I. , Mix, A. and Stoner, J. (2018) Cordilleran ice-sheet growth fueled primary productivity in the Gulf of Alaska, northeast Pacific Ocean , Geology, 46 (4), pp. 307-310 . doi:10.1130/G39904.1 <https://doi.org/10.1130/G39904.1> , hdl:10013/epic.5af342c3-e50f-4c64-92c6-8a5f392372d2 EPIC3Geology, The Geological Society of America, 46(4), pp. 307-310, ISSN: 0091-7613 Article isiRev 2018 ftawi https://doi.org/10.1130/G39904.1 2024-06-24T04:19:47Z 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 Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Geology 46 4 307 310 |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
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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 |
The Geological Society of America |
publishDate |
2018 |
url |
https://epic.awi.de/id/eprint/47104/ https://doi.org/10.1130/G39904.1 https://hdl.handle.net/10013/epic.5af342c3-e50f-4c64-92c6-8a5f392372d2 |
genre |
Ice Sheet Southern Ocean Subarctic Alaska |
genre_facet |
Ice Sheet Southern Ocean Subarctic Alaska |
op_source |
EPIC3Geology, The Geological Society of America, 46(4), pp. 307-310, ISSN: 0091-7613 |
op_relation |
Müller, J. orcid:0000-0003-0724-4131 , Romero, O. , Cowan, E. A. , McClymont, E. L. , Forwick, M. , Asahi, H. , März, C. , Moy, C. M. , Suto, I. , Mix, A. and Stoner, J. (2018) Cordilleran ice-sheet growth fueled primary productivity in the Gulf of Alaska, northeast Pacific Ocean , Geology, 46 (4), pp. 307-310 . doi:10.1130/G39904.1 <https://doi.org/10.1130/G39904.1> , hdl:10013/epic.5af342c3-e50f-4c64-92c6-8a5f392372d2 |
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_ |
1810449823909806080 |