Variability in summer surface residence time within a West Antarctic Peninsula biological hotspot

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
Josh T KohutWilliam R Fraser

Abstract

Palmer Deep canyon along the central West Antarctic Peninsula is known to have higher phytoplankton biomass than the surrounding non-canyon regions, but the circulation mechanisms that transport and locally concentrate phytoplankton and Antarctic krill, potentially increasing prey availability to upper-trophic-level predators such as penguins and cetaceans, are currently unknown. We deployed a three-site high-frequency radar network that provided hourly surface circulation maps over the Palmer Deep hotspot. A series of particle release experiments were used to estimate surface residence time and connectivity across the canyon. The majority of residence times fell between 1.0 and 3.5 days, with a mean of 2 days and a maximum of 5 days. We found a highly significant negative relationship between wind speed and residence time. Our residence time analysis indicates that the elevated phytoplankton biomass over the central canyon is transported into and out of the hotspot on time scales much shorter than the observed phytoplankton growth rate, suggesting that the canyon may not act as an incubator of phytoplankton productivity as previously suggested. It may instead serve more as a conveyor belt of phytoplankton biomass produced else...Continue Reading

References

Apr 4, 2007·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Hugh W DucklowWilliam Fraser
Oct 14, 1977·Science·D E BarrickB L Weber
Feb 6, 2013·PloS One·Matthew J OliverJosh Kohut
Jan 7, 2016·Scientific Reports·Megan A CiminoMatthew J Oliver

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Citations

May 16, 2018·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·Katharine R HendryHugh W Ducklow
May 16, 2018·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·Robert M SherrellMichael P Meredith

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