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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ftcdlib:oai:escholarship.org:ark:/13030/qt0hq6w8cm 2024-04-21T07:55:52+00:00 The Transformation and Export of Organic Carbon Across an Arctic River‐Delta‐Ocean Continuum Clark, J Blake Mannino, Antonio Tzortziou, Maria Spencer, Robert GM Hernes, Peter e2022jg007139 2022-12-01 application/pdf https://escholarship.org/uc/item/0hq6w8cm unknown eScholarship, University of California qt0hq6w8cm https://escholarship.org/uc/item/0hq6w8cm public Journal of Geophysical Research Biogeosciences, vol 127, iss 12 Earth Sciences Oceanography Atmospheric Sciences Geochemistry Life Below Water arctic biogeochemical modeling carbon cycle climate change land‐ocean continuum Geophysics article 2022 ftcdlib 2024-03-27T15:15:22Z 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 536GgC (∼80% of the annual total), but only 50% of the DOC and 25% of the POC exited the plume across the 10m isobath. Microbial breakdown of DOC accounted for a net loss of 168GgC (17% of delta export) within the plume and photodegradation accounted for a net loss of 46.6GgC DOC (5% of delta export) in 2019. Flocculation decreased the total organic carbon flux by only 6.4GgC (∼1%), while POC sinking accounted for 63.3GgC (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. Article in Journal/Newspaper Arctic Ocean Climate change Phytoplankton Yukon river Yukon University of California: eScholarship |
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Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Earth Sciences Oceanography Atmospheric Sciences Geochemistry Life Below Water arctic biogeochemical modeling carbon cycle climate change land‐ocean continuum Geophysics |
spellingShingle |
Earth Sciences Oceanography Atmospheric Sciences Geochemistry Life Below Water arctic biogeochemical modeling carbon cycle climate change land‐ocean continuum Geophysics Clark, J Blake Mannino, Antonio Tzortziou, Maria Spencer, Robert GM Hernes, Peter The Transformation and Export of Organic Carbon Across an Arctic River‐Delta‐Ocean Continuum |
topic_facet |
Earth Sciences Oceanography Atmospheric Sciences Geochemistry Life Below Water arctic biogeochemical modeling carbon cycle climate change land‐ocean continuum Geophysics |
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 536GgC (∼80% of the annual total), but only 50% of the DOC and 25% of the POC exited the plume across the 10m isobath. Microbial breakdown of DOC accounted for a net loss of 168GgC (17% of delta export) within the plume and photodegradation accounted for a net loss of 46.6GgC DOC (5% of delta export) in 2019. Flocculation decreased the total organic carbon flux by only 6.4GgC (∼1%), while POC sinking accounted for 63.3GgC (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 |
Article in Journal/Newspaper |
author |
Clark, J Blake Mannino, Antonio Tzortziou, Maria Spencer, Robert GM Hernes, Peter |
author_facet |
Clark, J Blake Mannino, Antonio Tzortziou, Maria Spencer, Robert GM 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 |
eScholarship, University of California |
publishDate |
2022 |
url |
https://escholarship.org/uc/item/0hq6w8cm |
op_coverage |
e2022jg007139 |
genre |
Arctic Ocean Climate change Phytoplankton Yukon river Yukon |
genre_facet |
Arctic Ocean Climate change Phytoplankton Yukon river Yukon |
op_source |
Journal of Geophysical Research Biogeosciences, vol 127, iss 12 |
op_relation |
qt0hq6w8cm https://escholarship.org/uc/item/0hq6w8cm |
op_rights |
public |
_version_ |
1796938134098804736 |