Carbon flux and particle-associated microbial remineralization rates in the northern Bering and southern Chukchi seas
Thesis (M.S.) University of Alaska Fairbanks, 2019 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...
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ftunivalaska:oai:scholarworks.alaska.edu:11122/10908 2023-05-15T14:51:42+02:00 Carbon flux and particle-associated microbial remineralization rates in the northern Bering and southern Chukchi seas O'Daly, Stephanie Hicks McDonnell, Andrew M. P. Hardy, Sarah M. Johnson, Mark A. 2019-12 http://hdl.handle.net/11122/10908 en_US eng http://hdl.handle.net/11122/10908 Department of Oceanography Thesis ms 2019 ftunivalaska 2023-02-23T21:37:35Z Thesis (M.S.) University of Alaska Fairbanks, 2019 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. North Pacific Research Board, grant numbers G-11255 and G-12333 Thesis Arctic Chukchi Climate change Phytoplankton Zooplankton Alaska University of Alaska: ScholarWorks@UA Arctic Fairbanks Pacific |
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Open Polar |
collection |
University of Alaska: ScholarWorks@UA |
op_collection_id |
ftunivalaska |
language |
English |
description |
Thesis (M.S.) University of Alaska Fairbanks, 2019 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. North Pacific Research Board, grant numbers G-11255 and G-12333 |
author2 |
McDonnell, Andrew M. P. Hardy, Sarah M. Johnson, Mark A. |
format |
Thesis |
author |
O'Daly, Stephanie Hicks |
spellingShingle |
O'Daly, Stephanie Hicks Carbon flux and particle-associated microbial remineralization rates in the northern Bering and southern Chukchi seas |
author_facet |
O'Daly, Stephanie Hicks |
author_sort |
O'Daly, Stephanie Hicks |
title |
Carbon flux and particle-associated microbial remineralization rates in the northern Bering and southern Chukchi seas |
title_short |
Carbon flux and particle-associated microbial remineralization rates in the northern Bering and southern Chukchi seas |
title_full |
Carbon flux and particle-associated microbial remineralization rates in the northern Bering and southern Chukchi seas |
title_fullStr |
Carbon flux and particle-associated microbial remineralization rates in the northern Bering and southern Chukchi seas |
title_full_unstemmed |
Carbon flux and particle-associated microbial remineralization rates in the northern Bering and southern Chukchi seas |
title_sort |
carbon flux and particle-associated microbial remineralization rates in the northern bering and southern chukchi seas |
publishDate |
2019 |
url |
http://hdl.handle.net/11122/10908 |
geographic |
Arctic Fairbanks Pacific |
geographic_facet |
Arctic Fairbanks Pacific |
genre |
Arctic Chukchi Climate change Phytoplankton Zooplankton Alaska |
genre_facet |
Arctic Chukchi Climate change Phytoplankton Zooplankton Alaska |
op_relation |
http://hdl.handle.net/11122/10908 Department of Oceanography |
_version_ |
1766322830218100736 |