Seasonal and Morphological Controls on Nitrate Retention in Arctic Deltas
Estimates of nitrate loading to the Arctic Ocean are limited by the lack of field observations within deltas partly due to logistical constraints. To overcome this limitation, we use a remote sensing framework to estimate retention of nitrate in Arctic deltas. We achieve this by coupling hydrologica...
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ftosti:oai:osti.gov:1970299 2023-07-30T04:00:21+02:00 Seasonal and Morphological Controls on Nitrate Retention in Arctic Deltas Knights, Deon Piliouras, Anastasia Schwenk, Jonathan Paul Hariharan, Jayaram Russoniello, Christopher 2023-04-21 application/pdf http://www.osti.gov/servlets/purl/1970299 https://www.osti.gov/biblio/1970299 https://doi.org/10.1029/2022GL102201 unknown http://www.osti.gov/servlets/purl/1970299 https://www.osti.gov/biblio/1970299 https://doi.org/10.1029/2022GL102201 doi:10.1029/2022GL102201 54 ENVIRONMENTAL SCIENCES 2023 ftosti https://doi.org/10.1029/2022GL102201 2023-07-11T10:26:38Z Estimates of nitrate loading to the Arctic Ocean are limited by the lack of field observations within deltas partly due to logistical constraints. To overcome this limitation, we use a remote sensing framework to estimate retention of nitrate in Arctic deltas. We achieve this by coupling hydrological and biogeochemical process models at the network scale for five major Arctic deltas. Binary masks of delta channels were used to simulate flow direction and magnitude through networks. Models were parameterized using historical and seasonal observations. Simulated nitrate retention ranged from 2.9% to 15% of the incoming load. Retention rates were largest during winter but smallest during spring conditions when increased discharges export large nitrate masses to the coast. Under future climate scenarios, retention rates fall by ~1%–10%. Arctic deltas have an important effect on the magnitude of nitrate entering Arctic seas and the inclusion of processing in deltas can improve flux estimates. Other/Unknown Material Arctic Arctic Ocean SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Arctic Arctic Ocean Geophysical Research Letters 50 7 |
institution |
Open Polar |
collection |
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 Knights, Deon Piliouras, Anastasia Schwenk, Jonathan Paul Hariharan, Jayaram Russoniello, Christopher Seasonal and Morphological Controls on Nitrate Retention in Arctic Deltas |
topic_facet |
54 ENVIRONMENTAL SCIENCES |
description |
Estimates of nitrate loading to the Arctic Ocean are limited by the lack of field observations within deltas partly due to logistical constraints. To overcome this limitation, we use a remote sensing framework to estimate retention of nitrate in Arctic deltas. We achieve this by coupling hydrological and biogeochemical process models at the network scale for five major Arctic deltas. Binary masks of delta channels were used to simulate flow direction and magnitude through networks. Models were parameterized using historical and seasonal observations. Simulated nitrate retention ranged from 2.9% to 15% of the incoming load. Retention rates were largest during winter but smallest during spring conditions when increased discharges export large nitrate masses to the coast. Under future climate scenarios, retention rates fall by ~1%–10%. Arctic deltas have an important effect on the magnitude of nitrate entering Arctic seas and the inclusion of processing in deltas can improve flux estimates. |
author |
Knights, Deon Piliouras, Anastasia Schwenk, Jonathan Paul Hariharan, Jayaram Russoniello, Christopher |
author_facet |
Knights, Deon Piliouras, Anastasia Schwenk, Jonathan Paul Hariharan, Jayaram Russoniello, Christopher |
author_sort |
Knights, Deon |
title |
Seasonal and Morphological Controls on Nitrate Retention in Arctic Deltas |
title_short |
Seasonal and Morphological Controls on Nitrate Retention in Arctic Deltas |
title_full |
Seasonal and Morphological Controls on Nitrate Retention in Arctic Deltas |
title_fullStr |
Seasonal and Morphological Controls on Nitrate Retention in Arctic Deltas |
title_full_unstemmed |
Seasonal and Morphological Controls on Nitrate Retention in Arctic Deltas |
title_sort |
seasonal and morphological controls on nitrate retention in arctic deltas |
publishDate |
2023 |
url |
http://www.osti.gov/servlets/purl/1970299 https://www.osti.gov/biblio/1970299 https://doi.org/10.1029/2022GL102201 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean |
genre_facet |
Arctic Arctic Ocean |
op_relation |
http://www.osti.gov/servlets/purl/1970299 https://www.osti.gov/biblio/1970299 https://doi.org/10.1029/2022GL102201 doi:10.1029/2022GL102201 |
op_doi |
https://doi.org/10.1029/2022GL102201 |
container_title |
Geophysical Research Letters |
container_volume |
50 |
container_issue |
7 |
_version_ |
1772810857131016192 |