Dissertation/Thesis Abstract

Carbon Flux and Particle-Associated Microbial Remineralization Rates in the Northern Bering and Southern Chukchi Seas
by O'Daly, Stephanie Hicks, M.S., University of Alaska Fairbanks, 2019, 76; 27548863
Abstract (Summary)

It has been hypothesized that climate change will reduce the strength and episodic nature of vernal phytoplankton blooms, increase heterotrophy of microbes and zooplankton, and weaken the tight coupling between pelagic and benthic production that is characteristic of Arctic continental shelves. As a part of the Arctic Shelf Growth, Advection, Respiration, and Deposition rates measurement (ASGARD) project, I quantified sinking particle fluxes and incubated sinking particles to measure the rate of microbial respiration associated with those particles. These measurements were used to characterize the strength of the pelagic-benthic connection. After a record-breaking year of warm temperatures and low-ice conditions in the northern Bering and southern Chukchi Seas, we observed massive vernal fluxes of sinking particulate organic carbon, ranking amongst the highest observed in the global oceans. Moreover, low rates of particle-associated microbial respiration indicate negligible recycling of sinking organic matter within the water column. These results suggest that the strength of the biological carbon pump may be maintained or enhanced in a warming Arctic, supporting strong benthic and upper trophic level productivity and carbon export.

Indexing (document details)
Advisor: McDonnell, Andrew M. P.
Commitee: Hardy, Sarah M., Johnson, Mark A.
School: University of Alaska Fairbanks
Department: Oceanography
School Location: United States -- Alaska
Source: MAI 81/6(E), Masters Abstracts International
Subjects: Chemical Oceanography, Biogeochemistry
Keywords: Biological carbon pump, Carbon flux, Climate change, Marine particles, Microbial respiration, Pacific Arctic Shelf
Publication Number: 27548863
ISBN: 9781392475997
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