Mid-Holocene Marine Paleoclimate Reconstruction Through Schlerochronological Analysis of Arctica islandica from Finnmark, Rolvsøya, Northern Norway
The long-lived marine bivalve Arctica islandica records the climatic conditions the organism experienced during its lifetime in its carbonate shell. Both the geochemical composition and the annually banded growth increments respond to ambient environmental forcing and are potentially valuable high r...
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ftbatescollege:oai:scarab.bates.edu:honorstheses-1184 2023-05-15T15:13:01+02:00 Mid-Holocene Marine Paleoclimate Reconstruction Through Schlerochronological Analysis of Arctica islandica from Finnmark, Rolvsøya, Northern Norway Mark, Samuel Zimet 2016-05-29T07:00:00Z application/pdf https://scarab.bates.edu/honorstheses/154 https://scarab.bates.edu/cgi/viewcontent.cgi?article=1184&context=honorstheses unknown SCARAB https://scarab.bates.edu/honorstheses/154 https://scarab.bates.edu/cgi/viewcontent.cgi?article=1184&context=honorstheses Honors Theses Paleoclimatology Norway A. islandica climate change Holocene Atmospheric Sciences Biogeochemistry Climate Geochemistry Geology Glaciology Oceanography text 2016 ftbatescollege 2022-03-22T09:19:22Z The long-lived marine bivalve Arctica islandica records the climatic conditions the organism experienced during its lifetime in its carbonate shell. Both the geochemical composition and the annually banded growth increments respond to ambient environmental forcing and are potentially valuable high resolution paleoclimatic proxies at high-latitude marine locations. Persistent climatological phenomena such as the North Atlantic Oscillation (NAO) and Arctic Oscillation (AO) at the climatologically and oceanographically significant island of Rolvsøya from which a series of A. islandica specimens were recovered dictate annual increment width via the oceanographic dynamics such as temperature and productivity. Furthermore, periods of synchronous growth can be identified in specimens that lived contemporaneously, allowing for floating and anchored chronologies to be established. A. islandica also secretes its aragonitic shell material in isotopic equilibrium with the ambient seawater. δ18O is inversely correlated with temperature in seawater; examining concentration of δ18O to δ16O in A. islandica allow for the reconstruction of temperature and seasonality. Growth rate and longevity measurements were made for sixty A. islandica specimens aged between 7315 and 1563 years B.P and geochemical analyses for two mid-Holocene specimens were undertaken. Growth analyses revealed accelerated growth during ontogenesis when compared to late-Holocene specimens. Two modifications of a preexisting δ18O based temperature derivation are presented in an attempt to better reflect conditions during the time period of interest. A decrease in seasonality, from 2.97°C to 1.53°C, occurred between 6245 B.P to 6011 B.P, potentially indicative of decreased vertical water column mixing as a result of increased overall temperature. Text Arctic Arctica islandica Climate change Finnmark North Atlantic North Atlantic oscillation Northern Norway Rolvsøya Finnmark Bates College: SCARAB (Scholarly Communication and Research at Bates) Arctic Norway Rolvsøya ENVELOPE(24.009,24.009,70.968,70.968) |
institution |
Open Polar |
collection |
Bates College: SCARAB (Scholarly Communication and Research at Bates) |
op_collection_id |
ftbatescollege |
language |
unknown |
topic |
Paleoclimatology Norway A. islandica climate change Holocene Atmospheric Sciences Biogeochemistry Climate Geochemistry Geology Glaciology Oceanography |
spellingShingle |
Paleoclimatology Norway A. islandica climate change Holocene Atmospheric Sciences Biogeochemistry Climate Geochemistry Geology Glaciology Oceanography Mark, Samuel Zimet Mid-Holocene Marine Paleoclimate Reconstruction Through Schlerochronological Analysis of Arctica islandica from Finnmark, Rolvsøya, Northern Norway |
topic_facet |
Paleoclimatology Norway A. islandica climate change Holocene Atmospheric Sciences Biogeochemistry Climate Geochemistry Geology Glaciology Oceanography |
description |
The long-lived marine bivalve Arctica islandica records the climatic conditions the organism experienced during its lifetime in its carbonate shell. Both the geochemical composition and the annually banded growth increments respond to ambient environmental forcing and are potentially valuable high resolution paleoclimatic proxies at high-latitude marine locations. Persistent climatological phenomena such as the North Atlantic Oscillation (NAO) and Arctic Oscillation (AO) at the climatologically and oceanographically significant island of Rolvsøya from which a series of A. islandica specimens were recovered dictate annual increment width via the oceanographic dynamics such as temperature and productivity. Furthermore, periods of synchronous growth can be identified in specimens that lived contemporaneously, allowing for floating and anchored chronologies to be established. A. islandica also secretes its aragonitic shell material in isotopic equilibrium with the ambient seawater. δ18O is inversely correlated with temperature in seawater; examining concentration of δ18O to δ16O in A. islandica allow for the reconstruction of temperature and seasonality. Growth rate and longevity measurements were made for sixty A. islandica specimens aged between 7315 and 1563 years B.P and geochemical analyses for two mid-Holocene specimens were undertaken. Growth analyses revealed accelerated growth during ontogenesis when compared to late-Holocene specimens. Two modifications of a preexisting δ18O based temperature derivation are presented in an attempt to better reflect conditions during the time period of interest. A decrease in seasonality, from 2.97°C to 1.53°C, occurred between 6245 B.P to 6011 B.P, potentially indicative of decreased vertical water column mixing as a result of increased overall temperature. |
format |
Text |
author |
Mark, Samuel Zimet |
author_facet |
Mark, Samuel Zimet |
author_sort |
Mark, Samuel Zimet |
title |
Mid-Holocene Marine Paleoclimate Reconstruction Through Schlerochronological Analysis of Arctica islandica from Finnmark, Rolvsøya, Northern Norway |
title_short |
Mid-Holocene Marine Paleoclimate Reconstruction Through Schlerochronological Analysis of Arctica islandica from Finnmark, Rolvsøya, Northern Norway |
title_full |
Mid-Holocene Marine Paleoclimate Reconstruction Through Schlerochronological Analysis of Arctica islandica from Finnmark, Rolvsøya, Northern Norway |
title_fullStr |
Mid-Holocene Marine Paleoclimate Reconstruction Through Schlerochronological Analysis of Arctica islandica from Finnmark, Rolvsøya, Northern Norway |
title_full_unstemmed |
Mid-Holocene Marine Paleoclimate Reconstruction Through Schlerochronological Analysis of Arctica islandica from Finnmark, Rolvsøya, Northern Norway |
title_sort |
mid-holocene marine paleoclimate reconstruction through schlerochronological analysis of arctica islandica from finnmark, rolvsøya, northern norway |
publisher |
SCARAB |
publishDate |
2016 |
url |
https://scarab.bates.edu/honorstheses/154 https://scarab.bates.edu/cgi/viewcontent.cgi?article=1184&context=honorstheses |
long_lat |
ENVELOPE(24.009,24.009,70.968,70.968) |
geographic |
Arctic Norway Rolvsøya |
geographic_facet |
Arctic Norway Rolvsøya |
genre |
Arctic Arctica islandica Climate change Finnmark North Atlantic North Atlantic oscillation Northern Norway Rolvsøya Finnmark |
genre_facet |
Arctic Arctica islandica Climate change Finnmark North Atlantic North Atlantic oscillation Northern Norway Rolvsøya Finnmark |
op_source |
Honors Theses |
op_relation |
https://scarab.bates.edu/honorstheses/154 https://scarab.bates.edu/cgi/viewcontent.cgi?article=1184&context=honorstheses |
_version_ |
1766343629937311744 |