The Transformation and Export of Organic Carbon Across an Arctic River‐Delta‐Ocean Continuum
The Arctic Ocean is surrounded by land that feeds highly seasonal rivers with water enriched in high concentrations of dissolved and particulate organic carbon (DOC and POC). Explicit estimates of the flux of organic carbon across the land‐ocean interface are difficult to quantify and many interdepe...
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ftpubmed:oai:pubmedcentral.nih.gov:10078588 2023-05-15T14:59:55+02:00 The Transformation and Export of Organic Carbon Across an Arctic River‐Delta‐Ocean Continuum Clark, J. Blake Mannino, Antonio Tzortziou, Maria Spencer, Robert G. M. Hernes, Peter 2022-12-12 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10078588/ https://doi.org/10.1029/2022JG007139 en eng John Wiley and Sons Inc. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10078588/ http://dx.doi.org/10.1029/2022JG007139 © 2022. The Authors. https://creativecommons.org/licenses/by/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. J Geophys Res Biogeosci Research Article Text 2022 ftpubmed https://doi.org/10.1029/2022JG007139 2023-04-09T01:09:01Z The Arctic Ocean is surrounded by land that feeds highly seasonal rivers with water enriched in high concentrations of dissolved and particulate organic carbon (DOC and POC). Explicit estimates of the flux of organic carbon across the land‐ocean interface are difficult to quantify and many interdependent processes makes source attribution difficult. A high‐resolution 3‐D biogeochemical model was built for the lower Yukon River and coastal ocean to estimate biogeochemical cycling across the land‐ocean continuum. The model solves for complex reactions related to organic carbon transformation, including mechanistic photodegradation and multi‐reactivity microbial processing, DOC–POC flocculation, and phytoplankton dynamics. The baseline DOC and POC flux out of the delta from April to September 2019, was 977 and 536 Gg C (∼80% of the annual total), but only 50% of the DOC and 25% of the POC exited the plume across the 10 m isobath. Microbial breakdown of DOC accounted for a net loss of 168 Gg C (17% of delta export) within the plume and photodegradation accounted for a net loss of 46.6 Gg C DOC (5% of delta export) in 2019. Flocculation decreased the total organic carbon flux by only 6.4 Gg C (∼1%), while POC sinking accounted for 63.3 Gg C (10%) settling in the plume. The loss of chromophoric dissolved organic matter due to photodegradation increased the light available for phytoplankton growth throughout the coastal ocean, demonstrating the secondary effects that organic carbon reactions can have on biological processes and the net coastal carbon flux. Text Arctic Arctic Ocean Phytoplankton Yukon river Yukon PubMed Central (PMC) Arctic Arctic Ocean Yukon Journal of Geophysical Research: Biogeosciences 127 12 |
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English |
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Research Article |
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Research Article Clark, J. Blake Mannino, Antonio Tzortziou, Maria Spencer, Robert G. M. Hernes, Peter The Transformation and Export of Organic Carbon Across an Arctic River‐Delta‐Ocean Continuum |
topic_facet |
Research Article |
description |
The Arctic Ocean is surrounded by land that feeds highly seasonal rivers with water enriched in high concentrations of dissolved and particulate organic carbon (DOC and POC). Explicit estimates of the flux of organic carbon across the land‐ocean interface are difficult to quantify and many interdependent processes makes source attribution difficult. A high‐resolution 3‐D biogeochemical model was built for the lower Yukon River and coastal ocean to estimate biogeochemical cycling across the land‐ocean continuum. The model solves for complex reactions related to organic carbon transformation, including mechanistic photodegradation and multi‐reactivity microbial processing, DOC–POC flocculation, and phytoplankton dynamics. The baseline DOC and POC flux out of the delta from April to September 2019, was 977 and 536 Gg C (∼80% of the annual total), but only 50% of the DOC and 25% of the POC exited the plume across the 10 m isobath. Microbial breakdown of DOC accounted for a net loss of 168 Gg C (17% of delta export) within the plume and photodegradation accounted for a net loss of 46.6 Gg C DOC (5% of delta export) in 2019. Flocculation decreased the total organic carbon flux by only 6.4 Gg C (∼1%), while POC sinking accounted for 63.3 Gg C (10%) settling in the plume. The loss of chromophoric dissolved organic matter due to photodegradation increased the light available for phytoplankton growth throughout the coastal ocean, demonstrating the secondary effects that organic carbon reactions can have on biological processes and the net coastal carbon flux. |
format |
Text |
author |
Clark, J. Blake Mannino, Antonio Tzortziou, Maria Spencer, Robert G. M. Hernes, Peter |
author_facet |
Clark, J. Blake Mannino, Antonio Tzortziou, Maria Spencer, Robert G. M. Hernes, Peter |
author_sort |
Clark, J. Blake |
title |
The Transformation and Export of Organic Carbon Across an Arctic River‐Delta‐Ocean Continuum |
title_short |
The Transformation and Export of Organic Carbon Across an Arctic River‐Delta‐Ocean Continuum |
title_full |
The Transformation and Export of Organic Carbon Across an Arctic River‐Delta‐Ocean Continuum |
title_fullStr |
The Transformation and Export of Organic Carbon Across an Arctic River‐Delta‐Ocean Continuum |
title_full_unstemmed |
The Transformation and Export of Organic Carbon Across an Arctic River‐Delta‐Ocean Continuum |
title_sort |
transformation and export of organic carbon across an arctic river‐delta‐ocean continuum |
publisher |
John Wiley and Sons Inc. |
publishDate |
2022 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10078588/ https://doi.org/10.1029/2022JG007139 |
geographic |
Arctic Arctic Ocean Yukon |
geographic_facet |
Arctic Arctic Ocean Yukon |
genre |
Arctic Arctic Ocean Phytoplankton Yukon river Yukon |
genre_facet |
Arctic Arctic Ocean Phytoplankton Yukon river Yukon |
op_source |
J Geophys Res Biogeosci |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10078588/ http://dx.doi.org/10.1029/2022JG007139 |
op_rights |
© 2022. The Authors. https://creativecommons.org/licenses/by/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
op_doi |
https://doi.org/10.1029/2022JG007139 |
container_title |
Journal of Geophysical Research: Biogeosciences |
container_volume |
127 |
container_issue |
12 |
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1766332041111011328 |