Cordilleran Ice-Sheet Growth Fueled Primary Productivity In The Gulf Of Alaska, Northeast Pacific Ocean

ASU Author/Contributor (non-ASU co-authors, if there are any, appear on document)
Ellen A. Cowan Ph.D, Professor (Creator)
Appalachian State University (ASU )
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Abstract: 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.

Additional Information

Juliane Müller, Oscar Romero, Ellen A. Cowan, Erin L. McClymont, Matthias Forwick, Hirofumi Asahi, Christian März, Christopher M. Moy, Itsuki Suto, Alan Mix, Joseph Stoner; Cordilleran ice-sheet growth fueled primary productivity in the Gulf of Alaska, northeast Pacific Ocean. Geology ; 46 (4): 307–310. doi: Publisher version of record available at:
Language: English
Date: 2018
RECAPP 2019, algae, glacial geology, Cordilleran Ice Sheet, Gulf of Alaska, glaciation, ice rafting, atmospheric transport

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