The multiple fates of sinking particles in the North Atlantic Ocean
Author Posting. © American Geophysical Union, 2015. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Global Biogeochemical Cycles 29 (2015): 1471–1494, doi:10.1002/2014GB005037. The direct respir...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/7652 2023-05-15T17:32:02+02:00 The multiple fates of sinking particles in the North Atlantic Ocean Collins, James R. Edwards, Bethanie R. Thamatrakoln, Kimberlee Ossolinski, Justin E. DiTullio, Giacomo R. Bidle, Kay D. Doney, Scott C. Van Mooy, Benjamin A. S. 2015-09-25 application/pdf https://hdl.handle.net/1912/7652 en_US eng John Wiley & Sons https://doi.org/10.1002/2014GB005037 Global Biogeochemical Cycles 29 (2015): 1471–1494 https://hdl.handle.net/1912/7652 doi:10.1002/2014GB005037 Global Biogeochemical Cycles 29 (2015): 1471–1494 doi:10.1002/2014GB005037 Carbon cycle Particle flux Bacterial growth efficiency Bacterial respiration Microbial respiration Article 2015 ftwhoas https://doi.org/10.1002/2014GB005037 2022-05-28T22:59:27Z Author Posting. © American Geophysical Union, 2015. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Global Biogeochemical Cycles 29 (2015): 1471–1494, doi:10.1002/2014GB005037. The direct respiration of sinking organic matter by attached bacteria is often invoked as the dominant sink for settling particles in the mesopelagic ocean. However, other processes, such as enzymatic solubilization and mechanical disaggregation, also contribute to particle flux attenuation by transferring organic matter to the water column. Here we use observations from the North Atlantic Ocean, coupled to sensitivity analyses of a simple model, to assess the relative importance of particle-attached microbial respiration compared to the other processes that can degrade sinking particles. The observed carbon fluxes, bacterial production rates, and respiration by water column and particle-attached microbial communities each spanned more than an order of magnitude. Rates of substrate-specific respiration on sinking particle material ranged from 0.007 ± 0.003 to 0.173 ± 0.105 day−1. A comparison of these substrate-specific respiration rates with model results suggested sinking particle material was transferred to the water column by various biological and mechanical processes nearly 3.5 times as fast as it was directly respired. This finding, coupled with strong metabolic demand imposed by measurements of water column respiration (729.3 ± 266.0 mg C m−2 d−1, on average, over the 50 to 150 m depth interval), suggested a large fraction of the organic matter evolved from sinking particles ultimately met its fate through subsequent remineralization in the water column. At three sites, we also measured very low bacterial growth efficiencies and large discrepancies between depth-integrated mesopelagic respiration and carbon inputs. U.S. Environmental Protection Agency (EPA) STAR Grant Number: FP-91744301-0; National Science Foundation ... Article in Journal/Newspaper North Atlantic Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Global Biogeochemical Cycles 29 9 1471 1494 |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Carbon cycle Particle flux Bacterial growth efficiency Bacterial respiration Microbial respiration |
spellingShingle |
Carbon cycle Particle flux Bacterial growth efficiency Bacterial respiration Microbial respiration Collins, James R. Edwards, Bethanie R. Thamatrakoln, Kimberlee Ossolinski, Justin E. DiTullio, Giacomo R. Bidle, Kay D. Doney, Scott C. Van Mooy, Benjamin A. S. The multiple fates of sinking particles in the North Atlantic Ocean |
topic_facet |
Carbon cycle Particle flux Bacterial growth efficiency Bacterial respiration Microbial respiration |
description |
Author Posting. © American Geophysical Union, 2015. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Global Biogeochemical Cycles 29 (2015): 1471–1494, doi:10.1002/2014GB005037. The direct respiration of sinking organic matter by attached bacteria is often invoked as the dominant sink for settling particles in the mesopelagic ocean. However, other processes, such as enzymatic solubilization and mechanical disaggregation, also contribute to particle flux attenuation by transferring organic matter to the water column. Here we use observations from the North Atlantic Ocean, coupled to sensitivity analyses of a simple model, to assess the relative importance of particle-attached microbial respiration compared to the other processes that can degrade sinking particles. The observed carbon fluxes, bacterial production rates, and respiration by water column and particle-attached microbial communities each spanned more than an order of magnitude. Rates of substrate-specific respiration on sinking particle material ranged from 0.007 ± 0.003 to 0.173 ± 0.105 day−1. A comparison of these substrate-specific respiration rates with model results suggested sinking particle material was transferred to the water column by various biological and mechanical processes nearly 3.5 times as fast as it was directly respired. This finding, coupled with strong metabolic demand imposed by measurements of water column respiration (729.3 ± 266.0 mg C m−2 d−1, on average, over the 50 to 150 m depth interval), suggested a large fraction of the organic matter evolved from sinking particles ultimately met its fate through subsequent remineralization in the water column. At three sites, we also measured very low bacterial growth efficiencies and large discrepancies between depth-integrated mesopelagic respiration and carbon inputs. U.S. Environmental Protection Agency (EPA) STAR Grant Number: FP-91744301-0; National Science Foundation ... |
format |
Article in Journal/Newspaper |
author |
Collins, James R. Edwards, Bethanie R. Thamatrakoln, Kimberlee Ossolinski, Justin E. DiTullio, Giacomo R. Bidle, Kay D. Doney, Scott C. Van Mooy, Benjamin A. S. |
author_facet |
Collins, James R. Edwards, Bethanie R. Thamatrakoln, Kimberlee Ossolinski, Justin E. DiTullio, Giacomo R. Bidle, Kay D. Doney, Scott C. Van Mooy, Benjamin A. S. |
author_sort |
Collins, James R. |
title |
The multiple fates of sinking particles in the North Atlantic Ocean |
title_short |
The multiple fates of sinking particles in the North Atlantic Ocean |
title_full |
The multiple fates of sinking particles in the North Atlantic Ocean |
title_fullStr |
The multiple fates of sinking particles in the North Atlantic Ocean |
title_full_unstemmed |
The multiple fates of sinking particles in the North Atlantic Ocean |
title_sort |
multiple fates of sinking particles in the north atlantic ocean |
publisher |
John Wiley & Sons |
publishDate |
2015 |
url |
https://hdl.handle.net/1912/7652 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Global Biogeochemical Cycles 29 (2015): 1471–1494 doi:10.1002/2014GB005037 |
op_relation |
https://doi.org/10.1002/2014GB005037 Global Biogeochemical Cycles 29 (2015): 1471–1494 https://hdl.handle.net/1912/7652 doi:10.1002/2014GB005037 |
op_doi |
https://doi.org/10.1002/2014GB005037 |
container_title |
Global Biogeochemical Cycles |
container_volume |
29 |
container_issue |
9 |
container_start_page |
1471 |
op_container_end_page |
1494 |
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1766129949976035328 |