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Particle flux on the continental shelf in the Amundsen Sea Polynya and Western Antarctic Peninsula

Cited 42 time in wos
Cited 47 time in scopus
Particle flux on the continental shelf in the Amundsen Sea Polynya and Western Antarctic Peninsula
Other Titles
아문젠 폴리냐와 서남극반도에서의 입자상 침강 플럭스
Hugh W. Ducklow
Patricia L. Yager
Robert M. Sherrell
Kate E. Lowry
Lee, Sang H.
Matthew Erickson
Sharon E. Stammerjohn
Anton F. Post
Stephanie E. Wilson
Environmental Sciences & EcologyMeteorology & Atmospheric Sciences
Amundsen Sea Polynyaparticle fluxwestern Antarctic Peninsula
Issue Date
Hugh W. Ducklow, et al. 2015. "Particle flux on the continental shelf in the Amundsen Sea Polynya and Western Antarctic Peninsula". Elementa: Science of the Anthropocene, 3(00046): 1-20.
We report results from a yearlong, moored sediment trap in the Amundsen Sea Polynya (ASP), the first such time series in this remote and productive ecosystem. Results are compared to a long-term (1992?2013) time series from the western Antarctic Peninsula (WAP). The ASP trap was deployed from December 2010 to December 2011 at 350 m depth. We observed two brief, but high flux events, peaking at 8 and 5 mmol C m?2 d?1 in January and December 2011, respectively, with a total annual capture of 315 mmol C m?2. Both peak fluxes and annual capture exceeded the comparable WAP observations. Like the overlying phytoplankton bloom observed during the cruise in the ASP (December 2010 to January 2011), particle flux was dominated by Phaeocystis antarctica, which produced phytodetrital aggregates. Particles at the start of the bloom were highly depleted in 13C, indicating their origin in the cold, CO2-rich winter waters exposed by retreating sea ice. As the bloom progressed, microscope visualization and stable isotopic composition provided evidence for an increasing contribution by zooplankton fecal material. Incubation experiments and zooplankton observations suggested that fecal pellet production likely contributed 10?40% of the total flux during the first flux event, and could be very high during episodic krill swarms. Independent estimates of export from the surface (100 m) were about 5?10 times that captured in the trap at 350 m. Estimated bacterial respiration was sufficient to account for much of the decline in the flux between 50 and 350 m, whereas zooplankton respiration was much lower. The ASP system appears to export only a small fraction of its production deeper than 350 m within the polynya region. The export efficiency was comparable to other polar regions where phytoplankton blooms were not dominated by diatoms.
Appears in Collections  
2012-2013, Physical & Bio-geochemical Processes in the Polar Sea Ice Regions: Their Roles & Responses in Global Climate Change (12-13) / Lee, Sang H. (PP12010; PP13020)
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