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    Particles in the Pacific: how productivity and zooplankton relate to particles in the deep sea

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    Author
    Pretty, Jessica L.
    Chair
    McDonnell, Andrew
    Committee
    Johnson, Mark
    Hopcroft, Russ
    Keyword
    particles
    marine productivity
    Pacific Ocean
    marine zooplankton
    marine phytoplankton
    marine plankton
    Carbon cycle
    biogeochemistry
    seawater
    Carbon dioxide content
    organic compound content
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    Metadata
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    URI
    http://hdl.handle.net/11122/10529
    Abstract
    The magnitude and spatio-temporal patterns of particulate material flux from the surface ocean through mesopelagic and bathypelagic depths determines sequestration of atmospheric carbon and the food supplied to deep-dwelling ocean life. The factors that influence how and where this organic material is exported from euphotic depths are poorly understood. Zooplankton are thought to play a key role in modulating the transport of surface-produced particles to depths through consumption, fragmentation, active diel vertical migration, and fecal pellet production, thus it is important to study both particulate matter and zooplankton in tandem. In this study, I use an in-situ optical instrument, the Underwater Video Profiler 5 (UVP5), to describe broad scale patterns of large (> 100 μm) particles and zooplankton across a longitudinal transect of the Pacific Ocean during April to June 2015. Satellite-derived surface chlorophyll-a was employed to describe the timescales over which particles arrive in meso- and bathypelagic depths after a productivity peak. High abundances and volumes of particles are noticeable beyond the euphotic zone across the Equator, transition zone, and the sub-arctic Pacific, indicating increased export in these high-nutrient low-chlorophyll (HNLC) areas. In two of these areas, the Equator and transition zone, large abundances and volumes of particles extend into bathypelagic depths. High abundances of zooplankton were seen in all areas where high abundances of particles are seen in bathypelagic waters. Rhizaria were revealed to be pervasive across all biogeographic regions, and appear to play a role in particle attenuation in the sub-arctic Pacific. The insight into patterns between particles, zooplankton, and productivity identify HNLC regions as deserving more detailed examination in future studies of biological pump efficiency.
    Description
    Thesis (M.S.) University of Alaska Fairbanks, 2019
    Date
    2019-05
    Type
    Thesis
    Collections
    College of Fisheries and Ocean Sciences
    Theses (Oceanography)

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