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...
Main Authors: | , , , , , , , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Geological Society of America
2018
|
Subjects: | |
Online Access: | https://eprints.whiterose.ac.uk/126648/ https://eprints.whiterose.ac.uk/126648/3/Manuscript_Mueller_et_al_Geology_resub.pdf |
id |
ftleedsuniv:oai:eprints.whiterose.ac.uk:126648 |
---|---|
record_format |
openpolar |
spelling |
ftleedsuniv:oai:eprints.whiterose.ac.uk:126648 2023-05-15T16:40:17+02:00 Cordilleran ice-sheet growth fueled primary productivity in the Gulf of Alaska, northeast Pacific Ocean Müller, J Romero, O Cowan, EA McClymont, EL Forwick, M Asahi, H März, C Moy, CM Suto, I Mix, A Stoner, J 2018-04 text https://eprints.whiterose.ac.uk/126648/ https://eprints.whiterose.ac.uk/126648/3/Manuscript_Mueller_et_al_Geology_resub.pdf en eng Geological Society of America https://eprints.whiterose.ac.uk/126648/3/Manuscript_Mueller_et_al_Geology_resub.pdf Müller, J, Romero, O, Cowan, EA et al. (8 more authors) (2018) Cordilleran ice-sheet growth fueled primary productivity in the Gulf of Alaska, northeast Pacific Ocean. Geology, 46 (4). pp. 307-310. ISSN 0091-7613 Article NonPeerReviewed 2018 ftleedsuniv 2023-01-30T22:03:06Z 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 White Rose Research Online (Universities of Leeds, Sheffield & York) Southern Ocean Gulf of Alaska Pacific |
institution |
Open Polar |
collection |
White Rose Research Online (Universities of Leeds, Sheffield & York) |
op_collection_id |
ftleedsuniv |
language |
English |
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, J Romero, O Cowan, EA McClymont, EL Forwick, M Asahi, H März, C Moy, CM Suto, I Mix, A Stoner, J |
spellingShingle |
Müller, J Romero, O Cowan, EA McClymont, EL Forwick, M Asahi, H März, C Moy, CM Suto, I Mix, A Stoner, J Cordilleran ice-sheet growth fueled primary productivity in the Gulf of Alaska, northeast Pacific Ocean |
author_facet |
Müller, J Romero, O Cowan, EA McClymont, EL Forwick, M Asahi, H März, C Moy, CM Suto, I Mix, A Stoner, J |
author_sort |
Müller, J |
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://eprints.whiterose.ac.uk/126648/ https://eprints.whiterose.ac.uk/126648/3/Manuscript_Mueller_et_al_Geology_resub.pdf |
geographic |
Southern Ocean Gulf of Alaska Pacific |
geographic_facet |
Southern Ocean Gulf of Alaska Pacific |
genre |
Ice Sheet Southern Ocean Subarctic Alaska |
genre_facet |
Ice Sheet Southern Ocean Subarctic Alaska |
op_relation |
https://eprints.whiterose.ac.uk/126648/3/Manuscript_Mueller_et_al_Geology_resub.pdf Müller, J, Romero, O, Cowan, EA et al. (8 more authors) (2018) Cordilleran ice-sheet growth fueled primary productivity in the Gulf of Alaska, northeast Pacific Ocean. Geology, 46 (4). pp. 307-310. ISSN 0091-7613 |
_version_ |
1766030677986246656 |