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dc.contributor.authorPretty, Jessica L.
dc.date.accessioned2019-07-06T20:01:38Z
dc.date.available2019-07-06T20:01:38Z
dc.date.issued2019-05
dc.identifier.urihttp://hdl.handle.net/11122/10529
dc.descriptionThesis (M.S.) University of Alaska Fairbanks, 2019en_US
dc.description.abstractThe 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.en_US
dc.description.sponsorshipNational Science Foundation (OCE #: 1421118, 145983,1654663)en_US
dc.language.isoen_USen_US
dc.subjectparticlesen_US
dc.subjectmarine productivityen_US
dc.subjectPacific Oceanen_US
dc.subjectmarine zooplanktonen_US
dc.subjectmarine phytoplanktonen_US
dc.subjectmarine planktonen_US
dc.subjectCarbon cycleen_US
dc.subjectbiogeochemistryen_US
dc.subjectseawateren_US
dc.subjectCarbon dioxide contenten_US
dc.subjectorganic compound contenten_US
dc.titleParticles in the Pacific: how productivity and zooplankton relate to particles in the deep seaen_US
dc.typeThesisen_US
dc.type.degreemsen_US
dc.identifier.departmentDepartment of Oceanographyen_US
dc.contributor.chairMcDonnell, Andrew
dc.contributor.committeeJohnson, Mark
dc.contributor.committeeHopcroft, Russ
refterms.dateFOA2020-03-06T02:41:41Z


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