Assessing the Potential Impact of River Chemistry on Arctic Coastal Production
The Arctic coastal margin receives a disproportionately large fraction of the global river discharge. The bio-geochemistry of the river water as it empties into the marine environment reflects inputs and processes that occur as the water travels from its headwaters. Climate-induced changes to Arctic...
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Online Access: | http://www.osti.gov/servlets/purl/1963636 https://www.osti.gov/biblio/1963636 https://doi.org/10.3389/fmars.2022.738363 |
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ftosti:oai:osti.gov:1963636 2023-07-30T04:00:26+02:00 Assessing the Potential Impact of River Chemistry on Arctic Coastal Production Gibson, Georgina A. Elliot, Scott M. Clement Kinney, Jaclyn Piliouras, Anastasia Jeffery, Nicole 2023-03-31 application/pdf http://www.osti.gov/servlets/purl/1963636 https://www.osti.gov/biblio/1963636 https://doi.org/10.3389/fmars.2022.738363 unknown http://www.osti.gov/servlets/purl/1963636 https://www.osti.gov/biblio/1963636 https://doi.org/10.3389/fmars.2022.738363 doi:10.3389/fmars.2022.738363 54 ENVIRONMENTAL SCIENCES 2023 ftosti https://doi.org/10.3389/fmars.2022.738363 2023-07-11T10:25:39Z The Arctic coastal margin receives a disproportionately large fraction of the global river discharge. The bio-geochemistry of the river water as it empties into the marine environment reflects inputs and processes that occur as the water travels from its headwaters. Climate-induced changes to Arctic vegetation and permafrost melt may impact river chemistry. Understanding the impact of river nutrients on coastal marine production, and how this may change in the future, are important for resource managers and community members who monitor and rely on coastal food resources. Using the Energy Exascale Earth System Model we explore the impact of timing and river nutrient concentrations on primary production in each coastal Arctic region and then assess how this influences secondary production and particle fluxes supporting the benthic food web. Our results indicate that while the concentration of Arctic river nitrogen can have a significant impact on annual average nitrogen and primary production in the coastal Arctic, with production increases of up to 20% in the river influenced interior Seas, the timing of the river nutrient inputs into the marine environment appears less important. Bloom timing and partitioning between small and large phytoplankton were minimally impacted by both river nutrient concentration and timing, suggesting that in general, coastal Arctic ecosystem dynamics will continue to be primarily driven by light availability, rather than nutrients. Under a doubling river nutrient scenario, the percentage increase in the POC flux to the benthos on river influenced Arctic coastal shelves was 2-4 times the percentage increase in primary production, suggesting changes to the river nutrient concentration has the potential to modify the Arctic food web structure and dynamics. Generally, the nutrient-induced changes to primary production were smaller than changes previously simulated in response to ice reduction and temperature increase. However, in the Laptev Sea, the production increase resulting from a ... Other/Unknown Material Arctic Ice laptev Laptev Sea permafrost Phytoplankton SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Arctic Laptev Sea Frontiers in Marine Science 9 |
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SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
op_collection_id |
ftosti |
language |
unknown |
topic |
54 ENVIRONMENTAL SCIENCES |
spellingShingle |
54 ENVIRONMENTAL SCIENCES Gibson, Georgina A. Elliot, Scott M. Clement Kinney, Jaclyn Piliouras, Anastasia Jeffery, Nicole Assessing the Potential Impact of River Chemistry on Arctic Coastal Production |
topic_facet |
54 ENVIRONMENTAL SCIENCES |
description |
The Arctic coastal margin receives a disproportionately large fraction of the global river discharge. The bio-geochemistry of the river water as it empties into the marine environment reflects inputs and processes that occur as the water travels from its headwaters. Climate-induced changes to Arctic vegetation and permafrost melt may impact river chemistry. Understanding the impact of river nutrients on coastal marine production, and how this may change in the future, are important for resource managers and community members who monitor and rely on coastal food resources. Using the Energy Exascale Earth System Model we explore the impact of timing and river nutrient concentrations on primary production in each coastal Arctic region and then assess how this influences secondary production and particle fluxes supporting the benthic food web. Our results indicate that while the concentration of Arctic river nitrogen can have a significant impact on annual average nitrogen and primary production in the coastal Arctic, with production increases of up to 20% in the river influenced interior Seas, the timing of the river nutrient inputs into the marine environment appears less important. Bloom timing and partitioning between small and large phytoplankton were minimally impacted by both river nutrient concentration and timing, suggesting that in general, coastal Arctic ecosystem dynamics will continue to be primarily driven by light availability, rather than nutrients. Under a doubling river nutrient scenario, the percentage increase in the POC flux to the benthos on river influenced Arctic coastal shelves was 2-4 times the percentage increase in primary production, suggesting changes to the river nutrient concentration has the potential to modify the Arctic food web structure and dynamics. Generally, the nutrient-induced changes to primary production were smaller than changes previously simulated in response to ice reduction and temperature increase. However, in the Laptev Sea, the production increase resulting from a ... |
author |
Gibson, Georgina A. Elliot, Scott M. Clement Kinney, Jaclyn Piliouras, Anastasia Jeffery, Nicole |
author_facet |
Gibson, Georgina A. Elliot, Scott M. Clement Kinney, Jaclyn Piliouras, Anastasia Jeffery, Nicole |
author_sort |
Gibson, Georgina A. |
title |
Assessing the Potential Impact of River Chemistry on Arctic Coastal Production |
title_short |
Assessing the Potential Impact of River Chemistry on Arctic Coastal Production |
title_full |
Assessing the Potential Impact of River Chemistry on Arctic Coastal Production |
title_fullStr |
Assessing the Potential Impact of River Chemistry on Arctic Coastal Production |
title_full_unstemmed |
Assessing the Potential Impact of River Chemistry on Arctic Coastal Production |
title_sort |
assessing the potential impact of river chemistry on arctic coastal production |
publishDate |
2023 |
url |
http://www.osti.gov/servlets/purl/1963636 https://www.osti.gov/biblio/1963636 https://doi.org/10.3389/fmars.2022.738363 |
geographic |
Arctic Laptev Sea |
geographic_facet |
Arctic Laptev Sea |
genre |
Arctic Ice laptev Laptev Sea permafrost Phytoplankton |
genre_facet |
Arctic Ice laptev Laptev Sea permafrost Phytoplankton |
op_relation |
http://www.osti.gov/servlets/purl/1963636 https://www.osti.gov/biblio/1963636 https://doi.org/10.3389/fmars.2022.738363 doi:10.3389/fmars.2022.738363 |
op_doi |
https://doi.org/10.3389/fmars.2022.738363 |
container_title |
Frontiers in Marine Science |
container_volume |
9 |
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1772810922584178688 |