Enhanced terrestrial runoff during Oceanic Anoxic Event 2 on the North Carolina Coastal Plain, USA
A global increase in the strength of the hydrologic cycle drove an increase in the flux of terrigenous sediments into the ocean during the Cenomanian–Turonian Oceanic Anoxic Event 2 (OAE2) and was an important mechanism driving nutrient enrichment and thus organic carbon burial. This global change i...
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fttriple:oai:gotriple.eu:oai:doaj.org/article:afe6364a3f054f4fbcd0e6e534f01ac3 2023-05-15T17:35:38+02:00 Enhanced terrestrial runoff during Oceanic Anoxic Event 2 on the North Carolina Coastal Plain, USA C. M. Lowery J. M. Self-Trail C. D. Barrie 2021-06-01 https://doi.org/10.5194/cp-17-1227-2021 https://cp.copernicus.org/articles/17/1227/2021/cp-17-1227-2021.pdf https://doaj.org/article/afe6364a3f054f4fbcd0e6e534f01ac3 en eng Copernicus Publications doi:10.5194/cp-17-1227-2021 1814-9324 1814-9332 https://cp.copernicus.org/articles/17/1227/2021/cp-17-1227-2021.pdf https://doaj.org/article/afe6364a3f054f4fbcd0e6e534f01ac3 undefined Climate of the Past, Vol 17, Pp 1227-1242 (2021) envir geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2021 fttriple https://doi.org/10.5194/cp-17-1227-2021 2023-01-22T18:55:27Z A global increase in the strength of the hydrologic cycle drove an increase in the flux of terrigenous sediments into the ocean during the Cenomanian–Turonian Oceanic Anoxic Event 2 (OAE2) and was an important mechanism driving nutrient enrichment and thus organic carbon burial. This global change is primarily known from isotopic records, but global average data do not tell us anything about changes at any particular location. Reconstructions of local terrigenous flux can help us understand the role of regional shifts in precipitation in driving these global trends. The proto-North Atlantic basin was one of the epicenters of enhanced organic carbon burial during OAE2, so constraining terrigenous flux is particularly important in this region; however, few local records exist. Here, we present two new OAE2 records from the Atlantic Coastal Plain of North Carolina, USA, recognized with calcareous nannoplankton biostratigraphy and organic carbon isotopes. We use carbon / nitrogen ratios to constrain the relative contribution of marine and terrestrial organic matter; in both cores we find an elevated contribution from vascular plants beginning just before OAE2 and continuing through the event, indicating a locally strengthened hydrologic cycle. Terrigenous flux decreased during the brief change in carbon isotope values known as the Plenus carbon isotope excursion; it then increased and remained elevated through the latter part of OAE2. Total organic carbon (TOC) values reveal relatively low organic carbon burial in the inner shelf, in contrast to black shales known from the open ocean. Organic carbon content on the shelf appears to increase in the offshore direction, highlighting the need for cores from the middle and outer shelf. Article in Journal/Newspaper North Atlantic Unknown Climate of the Past 17 3 1227 1242 |
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envir geo C. M. Lowery J. M. Self-Trail C. D. Barrie Enhanced terrestrial runoff during Oceanic Anoxic Event 2 on the North Carolina Coastal Plain, USA |
topic_facet |
envir geo |
description |
A global increase in the strength of the hydrologic cycle drove an increase in the flux of terrigenous sediments into the ocean during the Cenomanian–Turonian Oceanic Anoxic Event 2 (OAE2) and was an important mechanism driving nutrient enrichment and thus organic carbon burial. This global change is primarily known from isotopic records, but global average data do not tell us anything about changes at any particular location. Reconstructions of local terrigenous flux can help us understand the role of regional shifts in precipitation in driving these global trends. The proto-North Atlantic basin was one of the epicenters of enhanced organic carbon burial during OAE2, so constraining terrigenous flux is particularly important in this region; however, few local records exist. Here, we present two new OAE2 records from the Atlantic Coastal Plain of North Carolina, USA, recognized with calcareous nannoplankton biostratigraphy and organic carbon isotopes. We use carbon / nitrogen ratios to constrain the relative contribution of marine and terrestrial organic matter; in both cores we find an elevated contribution from vascular plants beginning just before OAE2 and continuing through the event, indicating a locally strengthened hydrologic cycle. Terrigenous flux decreased during the brief change in carbon isotope values known as the Plenus carbon isotope excursion; it then increased and remained elevated through the latter part of OAE2. Total organic carbon (TOC) values reveal relatively low organic carbon burial in the inner shelf, in contrast to black shales known from the open ocean. Organic carbon content on the shelf appears to increase in the offshore direction, highlighting the need for cores from the middle and outer shelf. |
format |
Article in Journal/Newspaper |
author |
C. M. Lowery J. M. Self-Trail C. D. Barrie |
author_facet |
C. M. Lowery J. M. Self-Trail C. D. Barrie |
author_sort |
C. M. Lowery |
title |
Enhanced terrestrial runoff during Oceanic Anoxic Event 2 on the North Carolina Coastal Plain, USA |
title_short |
Enhanced terrestrial runoff during Oceanic Anoxic Event 2 on the North Carolina Coastal Plain, USA |
title_full |
Enhanced terrestrial runoff during Oceanic Anoxic Event 2 on the North Carolina Coastal Plain, USA |
title_fullStr |
Enhanced terrestrial runoff during Oceanic Anoxic Event 2 on the North Carolina Coastal Plain, USA |
title_full_unstemmed |
Enhanced terrestrial runoff during Oceanic Anoxic Event 2 on the North Carolina Coastal Plain, USA |
title_sort |
enhanced terrestrial runoff during oceanic anoxic event 2 on the north carolina coastal plain, usa |
publisher |
Copernicus Publications |
publishDate |
2021 |
url |
https://doi.org/10.5194/cp-17-1227-2021 https://cp.copernicus.org/articles/17/1227/2021/cp-17-1227-2021.pdf https://doaj.org/article/afe6364a3f054f4fbcd0e6e534f01ac3 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Climate of the Past, Vol 17, Pp 1227-1242 (2021) |
op_relation |
doi:10.5194/cp-17-1227-2021 1814-9324 1814-9332 https://cp.copernicus.org/articles/17/1227/2021/cp-17-1227-2021.pdf https://doaj.org/article/afe6364a3f054f4fbcd0e6e534f01ac3 |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/cp-17-1227-2021 |
container_title |
Climate of the Past |
container_volume |
17 |
container_issue |
3 |
container_start_page |
1227 |
op_container_end_page |
1242 |
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