Last Interglacial Climate from Dendostrea frons Oysters, Verrill Island, Bermuda
The Bermuda Islands preserve carbonates recording many past changes in sea level, including multiple warm and cool geologic intervals. Several localities expose shell-rich deposits from the Last Interglacial (~125,000 years ago), a time broadly similar to climate today that can potentially serve as...
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ftgvstateuniv:oai:scholarworks.gvsu.edu:sss-1244 2023-05-15T15:44:42+02:00 Last Interglacial Climate from Dendostrea frons Oysters, Verrill Island, Bermuda Minnebo, Lillian 2021-01-01T08:00:00Z application/pdf https://scholarworks.gvsu.edu/sss/220 https://scholarworks.gvsu.edu/cgi/viewcontent.cgi?article=1244&context=sss unknown ScholarWorks@GVSU https://scholarworks.gvsu.edu/sss/220 https://scholarworks.gvsu.edu/cgi/viewcontent.cgi?article=1244&context=sss Student Summer Scholars Manuscripts Paleoclimate Oxygen isotopes Bermuda Last Interglacial Dendostrea frons Geology text 2021 ftgvstateuniv 2022-12-09T08:19:09Z The Bermuda Islands preserve carbonates recording many past changes in sea level, including multiple warm and cool geologic intervals. Several localities expose shell-rich deposits from the Last Interglacial (~125,000 years ago), a time broadly similar to climate today that can potentially serve as an analog for future conditions. Here, we use δ18O analyses of fossil mollusks to estimate past temperatures and seasonality and compare our data with those from other species. Eight Dendostrea frons oysters were sampled along their growth axes to reconstruct seasonal temperature curves. We report a mean δ18O value of -0.51 ± 0.17‰, corresponding to a temperature of ~23°C. These temperatures are similar to modern Bermuda (~16 to ~31°C), suggesting that North Atlantic circulation may have been similar to today. Grape Bay and Bird Island Glycymeris americana mollusks, well known in isotopic work, were utilized for interspecies analysis and report similar temperature reconstructions, ~22°C and ~24°C, respectively. The Dendostrea frons oysters require further evaluation to verify biologic effects as well as determine its oceanic depth environment. In comparison to other Last Interglacial temperature reconstructions these data could reflect a Gulf Stream current roughly as strong as today, in contrast to colder temperatures described in other studies. Text Bird Island North Atlantic Grand Valley State University: Scholar Works @ GVSU Bird Island ENVELOPE(-38.060,-38.060,-54.004,-54.004) |
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Grand Valley State University: Scholar Works @ GVSU |
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topic |
Paleoclimate Oxygen isotopes Bermuda Last Interglacial Dendostrea frons Geology |
spellingShingle |
Paleoclimate Oxygen isotopes Bermuda Last Interglacial Dendostrea frons Geology Minnebo, Lillian Last Interglacial Climate from Dendostrea frons Oysters, Verrill Island, Bermuda |
topic_facet |
Paleoclimate Oxygen isotopes Bermuda Last Interglacial Dendostrea frons Geology |
description |
The Bermuda Islands preserve carbonates recording many past changes in sea level, including multiple warm and cool geologic intervals. Several localities expose shell-rich deposits from the Last Interglacial (~125,000 years ago), a time broadly similar to climate today that can potentially serve as an analog for future conditions. Here, we use δ18O analyses of fossil mollusks to estimate past temperatures and seasonality and compare our data with those from other species. Eight Dendostrea frons oysters were sampled along their growth axes to reconstruct seasonal temperature curves. We report a mean δ18O value of -0.51 ± 0.17‰, corresponding to a temperature of ~23°C. These temperatures are similar to modern Bermuda (~16 to ~31°C), suggesting that North Atlantic circulation may have been similar to today. Grape Bay and Bird Island Glycymeris americana mollusks, well known in isotopic work, were utilized for interspecies analysis and report similar temperature reconstructions, ~22°C and ~24°C, respectively. The Dendostrea frons oysters require further evaluation to verify biologic effects as well as determine its oceanic depth environment. In comparison to other Last Interglacial temperature reconstructions these data could reflect a Gulf Stream current roughly as strong as today, in contrast to colder temperatures described in other studies. |
format |
Text |
author |
Minnebo, Lillian |
author_facet |
Minnebo, Lillian |
author_sort |
Minnebo, Lillian |
title |
Last Interglacial Climate from Dendostrea frons Oysters, Verrill Island, Bermuda |
title_short |
Last Interglacial Climate from Dendostrea frons Oysters, Verrill Island, Bermuda |
title_full |
Last Interglacial Climate from Dendostrea frons Oysters, Verrill Island, Bermuda |
title_fullStr |
Last Interglacial Climate from Dendostrea frons Oysters, Verrill Island, Bermuda |
title_full_unstemmed |
Last Interglacial Climate from Dendostrea frons Oysters, Verrill Island, Bermuda |
title_sort |
last interglacial climate from dendostrea frons oysters, verrill island, bermuda |
publisher |
ScholarWorks@GVSU |
publishDate |
2021 |
url |
https://scholarworks.gvsu.edu/sss/220 https://scholarworks.gvsu.edu/cgi/viewcontent.cgi?article=1244&context=sss |
long_lat |
ENVELOPE(-38.060,-38.060,-54.004,-54.004) |
geographic |
Bird Island |
geographic_facet |
Bird Island |
genre |
Bird Island North Atlantic |
genre_facet |
Bird Island North Atlantic |
op_source |
Student Summer Scholars Manuscripts |
op_relation |
https://scholarworks.gvsu.edu/sss/220 https://scholarworks.gvsu.edu/cgi/viewcontent.cgi?article=1244&context=sss |
_version_ |
1766379082879074304 |