Sources, distributions and dynamics of dissolved organic matter in the Canada and Makarov Basins
A comprehensive survey of dissolved organic carbon (DOC) and chromophoric dissolved organic matter (CDOM) was conducted in the Canada and Makarov Basins and adjacent seas during 2010-2012 to investigate the dynamics of dissolved organic matter (DOM) in the Arctic Ocean. Sources and distributions of...
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ftdoajarticles:oai:doaj.org/article:d1a8728bd4d84a07b1a8ecf5616aa275 2023-05-15T14:54:26+02:00 Sources, distributions and dynamics of dissolved organic matter in the Canada and Makarov Basins Yuan Shen Ronald Benner Lisa L. Robbins Jonathan G. Wynn 2016-10-01T00:00:00Z https://doi.org/10.3389/fmars.2016.00198 https://doaj.org/article/d1a8728bd4d84a07b1a8ecf5616aa275 EN eng Frontiers Media S.A. http://journal.frontiersin.org/Journal/10.3389/fmars.2016.00198/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2016.00198 https://doaj.org/article/d1a8728bd4d84a07b1a8ecf5616aa275 Frontiers in Marine Science, Vol 3 (2016) dissolved organic carbon Canada Basin Arctic Ocean chromophoric dissolved organic matter Makarov Basin Lignin phenols Science Q General. Including nature conservation geographical distribution QH1-199.5 article 2016 ftdoajarticles https://doi.org/10.3389/fmars.2016.00198 2022-12-30T23:57:04Z A comprehensive survey of dissolved organic carbon (DOC) and chromophoric dissolved organic matter (CDOM) was conducted in the Canada and Makarov Basins and adjacent seas during 2010-2012 to investigate the dynamics of dissolved organic matter (DOM) in the Arctic Ocean. Sources and distributions of DOM in polar surface waters were very heterogeneous and closely linked to hydrological conditions. Canada Basin surface waters had relatively low DOC concentrations (69±6 µmol L-1), CDOM absorption (a325: 0.32±0.07 m-1) and CDOM-derived lignin phenols (3±0.4 nmol L-1) and high spectral slope values (S275-295: 31.7±2.3 µm-1), indicating minor terrigenous inputs and evidence of photochemical alteration in the Beaufort Gyre. By contrast, surface waters of the Makarov Basin had elevated DOC (108±9 µmol L-1) and lignin phenol concentrations (15±3 nmol L-1), high a325 values (1.36±0.18 m-1) and low S275-295 values (22.8±0.8 µm-1), indicating pronounced Siberian river inputs associated with the Transpolar Drift and minor photochemical alteration. Observations near the Mendeleev Plain suggested limited interactions of the Transpolar Drift with Canada Basin waters, a scenario favoring export of Arctic DOM to the North Atlantic. The influence of sea-ice melt on DOM was region-dependent, resulting in an increase (Beaufort Sea), a decrease (Bering-Chukchi Seas), and negligible change (deep basins) in surface DOC concentrations and a325 values. Halocline structures differed between basins, and the Canada Basin upper halocline and Makarov Basin halocline were comparable in their average DOC (65-70 µmol L-1) and lignin phenol concentrations (3-4 nmol L-1) and S275-295 values (22.9-23.7 µm-1). Deep-water DOC concentrations decreased by 6-8 µmol L-1 with increasing depth, water mass age, nutrient concentrations, and apparent oxygen utilization. Maximal estimates of DOC degradation rates (0.036-0.039 µmol L-1 yr-1) in the deep Arctic were lower than those in other ocean basins, possibly due to low water temperatures. DOC concentrations ... Article in Journal/Newspaper Arctic Arctic Ocean Beaufort Sea canada basin Chukchi makarov basin North Atlantic Sea ice Directory of Open Access Journals: DOAJ Articles Arctic Arctic Ocean Canada Makarov Basin ENVELOPE(170.000,170.000,87.000,87.000) Mendeleev Plain ENVELOPE(-178.000,-178.000,80.000,80.000) Frontiers in Marine Science 3 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
dissolved organic carbon Canada Basin Arctic Ocean chromophoric dissolved organic matter Makarov Basin Lignin phenols Science Q General. Including nature conservation geographical distribution QH1-199.5 |
spellingShingle |
dissolved organic carbon Canada Basin Arctic Ocean chromophoric dissolved organic matter Makarov Basin Lignin phenols Science Q General. Including nature conservation geographical distribution QH1-199.5 Yuan Shen Ronald Benner Lisa L. Robbins Jonathan G. Wynn Sources, distributions and dynamics of dissolved organic matter in the Canada and Makarov Basins |
topic_facet |
dissolved organic carbon Canada Basin Arctic Ocean chromophoric dissolved organic matter Makarov Basin Lignin phenols Science Q General. Including nature conservation geographical distribution QH1-199.5 |
description |
A comprehensive survey of dissolved organic carbon (DOC) and chromophoric dissolved organic matter (CDOM) was conducted in the Canada and Makarov Basins and adjacent seas during 2010-2012 to investigate the dynamics of dissolved organic matter (DOM) in the Arctic Ocean. Sources and distributions of DOM in polar surface waters were very heterogeneous and closely linked to hydrological conditions. Canada Basin surface waters had relatively low DOC concentrations (69±6 µmol L-1), CDOM absorption (a325: 0.32±0.07 m-1) and CDOM-derived lignin phenols (3±0.4 nmol L-1) and high spectral slope values (S275-295: 31.7±2.3 µm-1), indicating minor terrigenous inputs and evidence of photochemical alteration in the Beaufort Gyre. By contrast, surface waters of the Makarov Basin had elevated DOC (108±9 µmol L-1) and lignin phenol concentrations (15±3 nmol L-1), high a325 values (1.36±0.18 m-1) and low S275-295 values (22.8±0.8 µm-1), indicating pronounced Siberian river inputs associated with the Transpolar Drift and minor photochemical alteration. Observations near the Mendeleev Plain suggested limited interactions of the Transpolar Drift with Canada Basin waters, a scenario favoring export of Arctic DOM to the North Atlantic. The influence of sea-ice melt on DOM was region-dependent, resulting in an increase (Beaufort Sea), a decrease (Bering-Chukchi Seas), and negligible change (deep basins) in surface DOC concentrations and a325 values. Halocline structures differed between basins, and the Canada Basin upper halocline and Makarov Basin halocline were comparable in their average DOC (65-70 µmol L-1) and lignin phenol concentrations (3-4 nmol L-1) and S275-295 values (22.9-23.7 µm-1). Deep-water DOC concentrations decreased by 6-8 µmol L-1 with increasing depth, water mass age, nutrient concentrations, and apparent oxygen utilization. Maximal estimates of DOC degradation rates (0.036-0.039 µmol L-1 yr-1) in the deep Arctic were lower than those in other ocean basins, possibly due to low water temperatures. DOC concentrations ... |
format |
Article in Journal/Newspaper |
author |
Yuan Shen Ronald Benner Lisa L. Robbins Jonathan G. Wynn |
author_facet |
Yuan Shen Ronald Benner Lisa L. Robbins Jonathan G. Wynn |
author_sort |
Yuan Shen |
title |
Sources, distributions and dynamics of dissolved organic matter in the Canada and Makarov Basins |
title_short |
Sources, distributions and dynamics of dissolved organic matter in the Canada and Makarov Basins |
title_full |
Sources, distributions and dynamics of dissolved organic matter in the Canada and Makarov Basins |
title_fullStr |
Sources, distributions and dynamics of dissolved organic matter in the Canada and Makarov Basins |
title_full_unstemmed |
Sources, distributions and dynamics of dissolved organic matter in the Canada and Makarov Basins |
title_sort |
sources, distributions and dynamics of dissolved organic matter in the canada and makarov basins |
publisher |
Frontiers Media S.A. |
publishDate |
2016 |
url |
https://doi.org/10.3389/fmars.2016.00198 https://doaj.org/article/d1a8728bd4d84a07b1a8ecf5616aa275 |
long_lat |
ENVELOPE(170.000,170.000,87.000,87.000) ENVELOPE(-178.000,-178.000,80.000,80.000) |
geographic |
Arctic Arctic Ocean Canada Makarov Basin Mendeleev Plain |
geographic_facet |
Arctic Arctic Ocean Canada Makarov Basin Mendeleev Plain |
genre |
Arctic Arctic Ocean Beaufort Sea canada basin Chukchi makarov basin North Atlantic Sea ice |
genre_facet |
Arctic Arctic Ocean Beaufort Sea canada basin Chukchi makarov basin North Atlantic Sea ice |
op_source |
Frontiers in Marine Science, Vol 3 (2016) |
op_relation |
http://journal.frontiersin.org/Journal/10.3389/fmars.2016.00198/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2016.00198 https://doaj.org/article/d1a8728bd4d84a07b1a8ecf5616aa275 |
op_doi |
https://doi.org/10.3389/fmars.2016.00198 |
container_title |
Frontiers in Marine Science |
container_volume |
3 |
_version_ |
1766326172503769088 |