Sources and cycling of dissolved and particulate organic radiocarbon in the northwest Atlantic continental margin
Continental shelves and slopes are productive and dynamic ocean margin systems that also regulate the fluxes of terrestrial, riverine, and estuarine materials between the continents and oceans. In order to evaluate the ages, potential sources, and transformations of organic matter in an ocean margin...
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Online Access: | https://scholarworks.wm.edu/vimsarticles/1324 https://scholarworks.wm.edu/context/vimsarticles/article/2329/viewcontent/Bauer_et_al_2001_Global_Biogeochemical_Cycles.pdf |
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ftwilliammarycol:oai:scholarworks.wm.edu:vimsarticles-2329 2023-06-11T04:15:25+02:00 Sources and cycling of dissolved and particulate organic radiocarbon in the northwest Atlantic continental margin Bauer, JE Druffel, ERM Wolgast, DM Griffin, S 2001-08-01T07:00:00Z application/pdf https://scholarworks.wm.edu/vimsarticles/1324 doi: 10.1029/2000GB001314 https://scholarworks.wm.edu/context/vimsarticles/article/2329/viewcontent/Bauer_et_al_2001_Global_Biogeochemical_Cycles.pdf unknown W&M ScholarWorks https://scholarworks.wm.edu/vimsarticles/1324 doi: 10.1029/2000GB001314 https://scholarworks.wm.edu/context/vimsarticles/article/2329/viewcontent/Bauer_et_al_2001_Global_Biogeochemical_Cycles.pdf VIMS Articles Chesapeake Bay Pacific-Ocean Marine-Sediments Shelf Water Temporal Variability Lateral Transport Physical Sciences Peer-Reviewed Articles Biogeochemistry text 2001 ftwilliammarycol https://doi.org/10.1029/2000GB001314 2023-05-04T17:57:38Z Continental shelves and slopes are productive and dynamic ocean margin systems that also regulate the fluxes of terrestrial, riverine, and estuarine materials between the continents and oceans. In order to evaluate the ages, potential sources, and transformations of organic matter in an ocean margin system, we measured the radiocarbon (Delta (14)C and delta (13)C distributions of total dissolved organic carbon (DOC), suspended particulate organic carbon (POC), and dissolved inorganic carbon (DIC) in waters of the Middle Atlantic Bight (MAB) continental shelf and slope in April-May 1994. The Delta (14)C of DOC was greatest (as high as -39 parts per thousand) in surface waters of the shelf, decreasing rapidly offshore and with depth, even in relatively shallow (25-50 in depth) shelf waters. The lowest Delta (14)C-DOC values were observed in deep slope waters, where they were significantly lower than values measured previously for the deep Sargasso Sea. There was a strong inverse relationship between Delta (14)C-DOC and delta (-13)C-DOC in all shelf and surface slope waters of the MAB, which is likely attributable to varying contributions of young, (14)C-enriched organic matter of terrestrial and/or riverine origin. The more highly (14)C-depleted DOC in deep : slope waters (as low as -442 parts per thousand) generally had a correspondingly lower delta (13)C (as low as -22.3 parts per thousand) component. However, this must originate from relic terrestrial material either in the MAB itself or be discharged to the MAB from rivers and estuaries. The isotopic signatures of POC were clearly differentiable from DOC and indicate that this pool also contained a broad range of both old and young material of terrestrial (delta (13)C as low as -24.9 parts per thousand) and marine (delta (13)C as high as -19.9 parts per thousand) origin throughout the MAB shelf and slope. The highest Delta (14)C-POC values (up to 78 parts per thousand) were observed in shallow shelf waters of the southern MAR Conversely, the lowest Delta ... Text Northwest Atlantic W&M ScholarWorks Pacific Global Biogeochemical Cycles 15 3 615 636 |
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Open Polar |
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W&M ScholarWorks |
op_collection_id |
ftwilliammarycol |
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unknown |
topic |
Chesapeake Bay Pacific-Ocean Marine-Sediments Shelf Water Temporal Variability Lateral Transport Physical Sciences Peer-Reviewed Articles Biogeochemistry |
spellingShingle |
Chesapeake Bay Pacific-Ocean Marine-Sediments Shelf Water Temporal Variability Lateral Transport Physical Sciences Peer-Reviewed Articles Biogeochemistry Bauer, JE Druffel, ERM Wolgast, DM Griffin, S Sources and cycling of dissolved and particulate organic radiocarbon in the northwest Atlantic continental margin |
topic_facet |
Chesapeake Bay Pacific-Ocean Marine-Sediments Shelf Water Temporal Variability Lateral Transport Physical Sciences Peer-Reviewed Articles Biogeochemistry |
description |
Continental shelves and slopes are productive and dynamic ocean margin systems that also regulate the fluxes of terrestrial, riverine, and estuarine materials between the continents and oceans. In order to evaluate the ages, potential sources, and transformations of organic matter in an ocean margin system, we measured the radiocarbon (Delta (14)C and delta (13)C distributions of total dissolved organic carbon (DOC), suspended particulate organic carbon (POC), and dissolved inorganic carbon (DIC) in waters of the Middle Atlantic Bight (MAB) continental shelf and slope in April-May 1994. The Delta (14)C of DOC was greatest (as high as -39 parts per thousand) in surface waters of the shelf, decreasing rapidly offshore and with depth, even in relatively shallow (25-50 in depth) shelf waters. The lowest Delta (14)C-DOC values were observed in deep slope waters, where they were significantly lower than values measured previously for the deep Sargasso Sea. There was a strong inverse relationship between Delta (14)C-DOC and delta (-13)C-DOC in all shelf and surface slope waters of the MAB, which is likely attributable to varying contributions of young, (14)C-enriched organic matter of terrestrial and/or riverine origin. The more highly (14)C-depleted DOC in deep : slope waters (as low as -442 parts per thousand) generally had a correspondingly lower delta (13)C (as low as -22.3 parts per thousand) component. However, this must originate from relic terrestrial material either in the MAB itself or be discharged to the MAB from rivers and estuaries. The isotopic signatures of POC were clearly differentiable from DOC and indicate that this pool also contained a broad range of both old and young material of terrestrial (delta (13)C as low as -24.9 parts per thousand) and marine (delta (13)C as high as -19.9 parts per thousand) origin throughout the MAB shelf and slope. The highest Delta (14)C-POC values (up to 78 parts per thousand) were observed in shallow shelf waters of the southern MAR Conversely, the lowest Delta ... |
format |
Text |
author |
Bauer, JE Druffel, ERM Wolgast, DM Griffin, S |
author_facet |
Bauer, JE Druffel, ERM Wolgast, DM Griffin, S |
author_sort |
Bauer, JE |
title |
Sources and cycling of dissolved and particulate organic radiocarbon in the northwest Atlantic continental margin |
title_short |
Sources and cycling of dissolved and particulate organic radiocarbon in the northwest Atlantic continental margin |
title_full |
Sources and cycling of dissolved and particulate organic radiocarbon in the northwest Atlantic continental margin |
title_fullStr |
Sources and cycling of dissolved and particulate organic radiocarbon in the northwest Atlantic continental margin |
title_full_unstemmed |
Sources and cycling of dissolved and particulate organic radiocarbon in the northwest Atlantic continental margin |
title_sort |
sources and cycling of dissolved and particulate organic radiocarbon in the northwest atlantic continental margin |
publisher |
W&M ScholarWorks |
publishDate |
2001 |
url |
https://scholarworks.wm.edu/vimsarticles/1324 https://scholarworks.wm.edu/context/vimsarticles/article/2329/viewcontent/Bauer_et_al_2001_Global_Biogeochemical_Cycles.pdf |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Northwest Atlantic |
genre_facet |
Northwest Atlantic |
op_source |
VIMS Articles |
op_relation |
https://scholarworks.wm.edu/vimsarticles/1324 doi: 10.1029/2000GB001314 https://scholarworks.wm.edu/context/vimsarticles/article/2329/viewcontent/Bauer_et_al_2001_Global_Biogeochemical_Cycles.pdf |
op_doi |
https://doi.org/10.1029/2000GB001314 |
container_title |
Global Biogeochemical Cycles |
container_volume |
15 |
container_issue |
3 |
container_start_page |
615 |
op_container_end_page |
636 |
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1768372229289017344 |