Merging Satellite and in situ Data to Assess the Flux of Terrestrial Dissolved Organic Carbon From the Mackenzie River to the Coastal Beaufort Sea
In response to global warming, the Arctic is undergoing rapid and unprecedented changes that alter the land-to-sea forcing in large Arctic rivers. Improving our knowledge of terrestrial dissolved organic carbon (tDOC) flux to the coastal Arctic Ocean (AO) is thus critical and timely as these changes...
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crfrontiers:10.3389/feart.2022.694062 2024-06-23T07:50:06+00:00 Merging Satellite and in situ Data to Assess the Flux of Terrestrial Dissolved Organic Carbon From the Mackenzie River to the Coastal Beaufort Sea Bertin, Clément Matsuoka, Atsushi Mangin, Antoine Babin, Marcel Le Fouest, Vincent 2022 http://dx.doi.org/10.3389/feart.2022.694062 https://www.frontiersin.org/articles/10.3389/feart.2022.694062/full unknown Frontiers Media SA https://creativecommons.org/licenses/by/4.0/ Frontiers in Earth Science volume 10 ISSN 2296-6463 journal-article 2022 crfrontiers https://doi.org/10.3389/feart.2022.694062 2024-06-11T04:09:20Z In response to global warming, the Arctic is undergoing rapid and unprecedented changes that alter the land-to-sea forcing in large Arctic rivers. Improving our knowledge of terrestrial dissolved organic carbon (tDOC) flux to the coastal Arctic Ocean (AO) is thus critical and timely as these changes strongly alter the biogeochemical cycles on AO shelves. In this study, we merged riverine in situ tDOC concentrations with satellite ocean-color estimates retrieved at the land-marine interface of the Mackenzie Delta to make a first assessment of the tDOC export from its main outlets to the shelf. We combined tDOC and river discharge data to develop a regression model that simulated tDOC concentrations and fluxes from daily to interannual (2003–2017) time scales. We then compared the simulated satellite-derived estimates to those simulated by the model constrained by in situ tDOC data only. As the satellite tDOC estimates reflect the delta effect in terms of tDOC enrichment and removal, our results inform us of how much tDOC can potentially leave the delta to reach the ocean (1.44 ± 0.14 TgC.yr −1 ). The chemodynamic relationships and the model suggest contrasting patterns between Shallow Bay and the two easternmost delta outlets, which can be explained by the variability in their geomorphological settings. At the seasonal scale and for all outlets, the satellite-derived tDOC export departs from the estimate based on in situ tDOC data only. During the river freshet in May, the satellite-derived tDOC export is, on average, ∼15% (Shallow Bay) to ∼20% (Beluga Bay) lower than the in situ-derived estimate. This difference was the highest (−60%) in 2005 and exceeds 30% over most of the last decade, and can be explained by qualitative and quantitative differences between the tDOC in situ and tDOC sat datasets in a period when the freshet is highly variable. In contrast, in summer and fall, the satellite-derived tDOC export is higher than the in situ-derived estimate. The temporal difference between the satellite and in ... Article in Journal/Newspaper Arctic Arctic Ocean Beaufort Sea Beluga Beluga* Global warming Mackenzie Delta Mackenzie river Frontiers (Publisher) Arctic Arctic Ocean Beluga Bay ENVELOPE(-135.089,-135.089,69.583,69.583) Mackenzie Delta ENVELOPE(-136.672,-136.672,68.833,68.833) Mackenzie River Shallow Bay ENVELOPE(67.467,67.467,-67.817,-67.817) Frontiers in Earth Science 10 |
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Frontiers (Publisher) |
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description |
In response to global warming, the Arctic is undergoing rapid and unprecedented changes that alter the land-to-sea forcing in large Arctic rivers. Improving our knowledge of terrestrial dissolved organic carbon (tDOC) flux to the coastal Arctic Ocean (AO) is thus critical and timely as these changes strongly alter the biogeochemical cycles on AO shelves. In this study, we merged riverine in situ tDOC concentrations with satellite ocean-color estimates retrieved at the land-marine interface of the Mackenzie Delta to make a first assessment of the tDOC export from its main outlets to the shelf. We combined tDOC and river discharge data to develop a regression model that simulated tDOC concentrations and fluxes from daily to interannual (2003–2017) time scales. We then compared the simulated satellite-derived estimates to those simulated by the model constrained by in situ tDOC data only. As the satellite tDOC estimates reflect the delta effect in terms of tDOC enrichment and removal, our results inform us of how much tDOC can potentially leave the delta to reach the ocean (1.44 ± 0.14 TgC.yr −1 ). The chemodynamic relationships and the model suggest contrasting patterns between Shallow Bay and the two easternmost delta outlets, which can be explained by the variability in their geomorphological settings. At the seasonal scale and for all outlets, the satellite-derived tDOC export departs from the estimate based on in situ tDOC data only. During the river freshet in May, the satellite-derived tDOC export is, on average, ∼15% (Shallow Bay) to ∼20% (Beluga Bay) lower than the in situ-derived estimate. This difference was the highest (−60%) in 2005 and exceeds 30% over most of the last decade, and can be explained by qualitative and quantitative differences between the tDOC in situ and tDOC sat datasets in a period when the freshet is highly variable. In contrast, in summer and fall, the satellite-derived tDOC export is higher than the in situ-derived estimate. The temporal difference between the satellite and in ... |
format |
Article in Journal/Newspaper |
author |
Bertin, Clément Matsuoka, Atsushi Mangin, Antoine Babin, Marcel Le Fouest, Vincent |
spellingShingle |
Bertin, Clément Matsuoka, Atsushi Mangin, Antoine Babin, Marcel Le Fouest, Vincent Merging Satellite and in situ Data to Assess the Flux of Terrestrial Dissolved Organic Carbon From the Mackenzie River to the Coastal Beaufort Sea |
author_facet |
Bertin, Clément Matsuoka, Atsushi Mangin, Antoine Babin, Marcel Le Fouest, Vincent |
author_sort |
Bertin, Clément |
title |
Merging Satellite and in situ Data to Assess the Flux of Terrestrial Dissolved Organic Carbon From the Mackenzie River to the Coastal Beaufort Sea |
title_short |
Merging Satellite and in situ Data to Assess the Flux of Terrestrial Dissolved Organic Carbon From the Mackenzie River to the Coastal Beaufort Sea |
title_full |
Merging Satellite and in situ Data to Assess the Flux of Terrestrial Dissolved Organic Carbon From the Mackenzie River to the Coastal Beaufort Sea |
title_fullStr |
Merging Satellite and in situ Data to Assess the Flux of Terrestrial Dissolved Organic Carbon From the Mackenzie River to the Coastal Beaufort Sea |
title_full_unstemmed |
Merging Satellite and in situ Data to Assess the Flux of Terrestrial Dissolved Organic Carbon From the Mackenzie River to the Coastal Beaufort Sea |
title_sort |
merging satellite and in situ data to assess the flux of terrestrial dissolved organic carbon from the mackenzie river to the coastal beaufort sea |
publisher |
Frontiers Media SA |
publishDate |
2022 |
url |
http://dx.doi.org/10.3389/feart.2022.694062 https://www.frontiersin.org/articles/10.3389/feart.2022.694062/full |
long_lat |
ENVELOPE(-135.089,-135.089,69.583,69.583) ENVELOPE(-136.672,-136.672,68.833,68.833) ENVELOPE(67.467,67.467,-67.817,-67.817) |
geographic |
Arctic Arctic Ocean Beluga Bay Mackenzie Delta Mackenzie River Shallow Bay |
geographic_facet |
Arctic Arctic Ocean Beluga Bay Mackenzie Delta Mackenzie River Shallow Bay |
genre |
Arctic Arctic Ocean Beaufort Sea Beluga Beluga* Global warming Mackenzie Delta Mackenzie river |
genre_facet |
Arctic Arctic Ocean Beaufort Sea Beluga Beluga* Global warming Mackenzie Delta Mackenzie river |
op_source |
Frontiers in Earth Science volume 10 ISSN 2296-6463 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3389/feart.2022.694062 |
container_title |
Frontiers in Earth Science |
container_volume |
10 |
_version_ |
1802640864142426112 |