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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

Geology (Boulder), 2018-04, Vol.46 (4), p.307-310 [Periódico revisado por pares]

Boulder: Geological Society of America (GSA)

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Título:
Cordilleran ice-sheet growth fueled primary productivity in the Gulf of Alaska, Northeast Pacific Ocean
Autor: 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
Assuntos: algae ; Atmospheric particulates ; atmospheric transport ; Bioavailability ; Biological fertilization ; biostratigraphy ; Cenozoic ; Chlorophyll ; Chlorophylls ; clastic sediments ; Climate variability ; Cordilleran ice sheet ; cores ; debris ; diatoms ; Drilling ; Dust ; Dust storms ; Dynamics ; East Pacific ; Eolian dust ; Expedition 341 ; Exports ; Fertilization ; Geofag: 450 ; Geosciences: 450 ; Glacial climates ; glacial geology ; Glacial periods ; Glaciation ; Glaciers ; Growth ; Gulf of Alaska ; Ice ; Ice ages ; ice rafting ; Ice sheets ; Icebergs ; Integrated Ocean Drilling Program ; Interglacial periods ; IODP Site U1417 ; Iron ; Kvartærgeologi, glasiologi: 465 ; lithostratigraphy ; marine sediments ; Matematikk og Naturvitenskap: 400 ; Mathematics and natural science: 400 ; metals ; microfossils ; Mineral nutrients ; North Pacific ; Northeast Pacific ; nutrients ; Ocean floor ; Oceanography ; Oceans ; Pacific Ocean ; Phytoplankton ; Plankton ; Pleistocene ; Primary production ; Productivity ; Quaternary ; Quaternary geology ; Quaternary geology, glaciology: 465 ; sea water ; Sediments ; transport ; VDP
É parte de: Geology (Boulder), 2018-04, Vol.46 (4), p.307-310
Notas: Geology
Descrição: 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.
Editor: Boulder: Geological Society of America (GSA)
Idioma: Inglês

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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

Boulder: Geological Society of America (GSA)

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