Assessing Environmental Change Associated with Early Eocene Hyperthermals in the Atlantic Coastal Plain, USA
Eocene transient global warming events (hyperthermals) can provide insight into a future, warmer world. While much research has focused on the Paleocene-Eocene Thermal Maximum (PETM), hyperthermals of smaller magnitude can be used to characterize climatic responses over different magnitudes of forci...
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00064705 2023-05-15T15:12:44+02:00 Assessing Environmental Change Associated with Early Eocene Hyperthermals in the Atlantic Coastal Plain, USA Rush, William Davis Self-Trail, Jean Zhang, Yang Sluijs, Appy Brinkhuis, Henk Zachos, James Ogg, James Robinson, Marci 2023-01 electronic https://doi.org/10.5194/egusphere-2023-58 https://noa.gwlb.de/receive/cop_mods_00064705 https://egusphere.copernicus.org/preprints/egusphere-2023-58/egusphere-2023-58.pdf eng eng Copernicus Publications https://doi.org/10.5194/egusphere-2023-58 https://noa.gwlb.de/receive/cop_mods_00064705 https://egusphere.copernicus.org/preprints/egusphere-2023-58/egusphere-2023-58.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/restrictedAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2023 ftnonlinearchiv https://doi.org/10.5194/egusphere-2023-58 2023-01-30T00:13:22Z Eocene transient global warming events (hyperthermals) can provide insight into a future, warmer world. While much research has focused on the Paleocene-Eocene Thermal Maximum (PETM), hyperthermals of smaller magnitude can be used to characterize climatic responses over different magnitudes of forcing. This study identifies two events, Eocene Thermal Maximum 2 (ETM2 and H2) for the first time in a shallow marine setting along the United States Atlantic margin in the Salisbury Embayment of Maryland, based on magnetostratigraphy, calcareous nannofossil and dinocyst biostratigraphy, and recognition of negative stable carbon isotope excursions (CIEs) in biogenic calcite. We assess local environmental change in the Salisbury Embayment utilizing clay mineralogy, marine palynology, δ18O of biogenic calcite, and biomarker paleothermometry (TEX86). Paleo-temperature proxies show broad agreement between surface water and bottom water temperature changes. However, the timing of warming does not correspond to the CIE of ETM2 as expected from other records, and the highest values are observed during H2, suggesting factors other than pCO2 forcing influenced temperature changes in the region. The ETM2 interval exhibits a shift in clay mineralogy from smectite-dominated facies to illite-rich facies, suggesting hydroclimatic changes but with a rather dampened weathering response relative to that of the PETM in the same region. Organic walled dinoflagellate cyst assemblages show large fluctuations throughout the studied section, none of which seem systematically related to ETM2. These observations are contrary to the typical tight correspondence between climate change and assemblages across the PETM, regionally and globally, and ETM2 in the Arctic Ocean. The data do indicate very warm and (seasonally) stratified conditions, likely salinity-driven, across H2. The absence of evidence for strong perturbations in local hydrology and nutrient supply during ETM2 and H2, compared to the PETM, is consistent with the less extreme forcing ... Article in Journal/Newspaper Arctic Arctic Ocean Climate change Global warming Niedersächsisches Online-Archiv NOA Arctic Arctic Ocean Salisbury ENVELOPE(-153.617,-153.617,-85.633,-85.633) |
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Niedersächsisches Online-Archiv NOA |
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ftnonlinearchiv |
language |
English |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Rush, William Davis Self-Trail, Jean Zhang, Yang Sluijs, Appy Brinkhuis, Henk Zachos, James Ogg, James Robinson, Marci Assessing Environmental Change Associated with Early Eocene Hyperthermals in the Atlantic Coastal Plain, USA |
topic_facet |
article Verlagsveröffentlichung |
description |
Eocene transient global warming events (hyperthermals) can provide insight into a future, warmer world. While much research has focused on the Paleocene-Eocene Thermal Maximum (PETM), hyperthermals of smaller magnitude can be used to characterize climatic responses over different magnitudes of forcing. This study identifies two events, Eocene Thermal Maximum 2 (ETM2 and H2) for the first time in a shallow marine setting along the United States Atlantic margin in the Salisbury Embayment of Maryland, based on magnetostratigraphy, calcareous nannofossil and dinocyst biostratigraphy, and recognition of negative stable carbon isotope excursions (CIEs) in biogenic calcite. We assess local environmental change in the Salisbury Embayment utilizing clay mineralogy, marine palynology, δ18O of biogenic calcite, and biomarker paleothermometry (TEX86). Paleo-temperature proxies show broad agreement between surface water and bottom water temperature changes. However, the timing of warming does not correspond to the CIE of ETM2 as expected from other records, and the highest values are observed during H2, suggesting factors other than pCO2 forcing influenced temperature changes in the region. The ETM2 interval exhibits a shift in clay mineralogy from smectite-dominated facies to illite-rich facies, suggesting hydroclimatic changes but with a rather dampened weathering response relative to that of the PETM in the same region. Organic walled dinoflagellate cyst assemblages show large fluctuations throughout the studied section, none of which seem systematically related to ETM2. These observations are contrary to the typical tight correspondence between climate change and assemblages across the PETM, regionally and globally, and ETM2 in the Arctic Ocean. The data do indicate very warm and (seasonally) stratified conditions, likely salinity-driven, across H2. The absence of evidence for strong perturbations in local hydrology and nutrient supply during ETM2 and H2, compared to the PETM, is consistent with the less extreme forcing ... |
format |
Article in Journal/Newspaper |
author |
Rush, William Davis Self-Trail, Jean Zhang, Yang Sluijs, Appy Brinkhuis, Henk Zachos, James Ogg, James Robinson, Marci |
author_facet |
Rush, William Davis Self-Trail, Jean Zhang, Yang Sluijs, Appy Brinkhuis, Henk Zachos, James Ogg, James Robinson, Marci |
author_sort |
Rush, William Davis |
title |
Assessing Environmental Change Associated with Early Eocene Hyperthermals in the Atlantic Coastal Plain, USA |
title_short |
Assessing Environmental Change Associated with Early Eocene Hyperthermals in the Atlantic Coastal Plain, USA |
title_full |
Assessing Environmental Change Associated with Early Eocene Hyperthermals in the Atlantic Coastal Plain, USA |
title_fullStr |
Assessing Environmental Change Associated with Early Eocene Hyperthermals in the Atlantic Coastal Plain, USA |
title_full_unstemmed |
Assessing Environmental Change Associated with Early Eocene Hyperthermals in the Atlantic Coastal Plain, USA |
title_sort |
assessing environmental change associated with early eocene hyperthermals in the atlantic coastal plain, usa |
publisher |
Copernicus Publications |
publishDate |
2023 |
url |
https://doi.org/10.5194/egusphere-2023-58 https://noa.gwlb.de/receive/cop_mods_00064705 https://egusphere.copernicus.org/preprints/egusphere-2023-58/egusphere-2023-58.pdf |
long_lat |
ENVELOPE(-153.617,-153.617,-85.633,-85.633) |
geographic |
Arctic Arctic Ocean Salisbury |
geographic_facet |
Arctic Arctic Ocean Salisbury |
genre |
Arctic Arctic Ocean Climate change Global warming |
genre_facet |
Arctic Arctic Ocean Climate change Global warming |
op_relation |
https://doi.org/10.5194/egusphere-2023-58 https://noa.gwlb.de/receive/cop_mods_00064705 https://egusphere.copernicus.org/preprints/egusphere-2023-58/egusphere-2023-58.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/restrictedAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/egusphere-2023-58 |
_version_ |
1766343382978789376 |