Oxygen and Silicon Stable Isotopes of Diatom Silica: Reconstructing Changes in Surface Water Hydrography and Silicic Acid Utilization in the Late Pleistocene Subarctic Pacific
Deglacial variations in upper ocean nutrient dynamics and stratification in high latitudes, as well as associated changes in thermohaline overturning circulation, are thought to have played a key role in changing atmospheric CO2 concentrations. This thesis examines the relationship between past chan...
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Universität Bremen
2014
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ftsubbremen:oai:media.suub.uni-bremen.de:Publications/elib/700 2023-05-15T16:41:09+02:00 Oxygen and Silicon Stable Isotopes of Diatom Silica: Reconstructing Changes in Surface Water Hydrography and Silicic Acid Utilization in the Late Pleistocene Subarctic Pacific Sauerstoff- und Siliziumisotope aus Diatomeensilikat: Rekonstruktion spätpleistozäner Änderungen in der Oberflächenwasserhydrographie und -kieselsäurenutzung des subarktischen Pazifiks Maier, Edith Tiedemann, Ralf Bohrmann, Gerhard 2014-06-04 application/pdf https://media.suub.uni-bremen.de/handle/elib/700 https://nbn-resolving.org/urn:nbn:de:gbv:46-00103890-18 eng eng Universität Bremen FB5 Geowissenschaften https://media.suub.uni-bremen.de/handle/elib/700 urn:nbn:de:gbv:46-00103890-18 info:eu-repo/semantics/openAccess Bitte wählen Sie eine Lizenz aus: (Unsere Empfehlung: CC-BY) CC-BY diatom silica silicon isotopes oxygen isotopes termination 1 Last Glacial Holocene surface water stratification nutrient utilization meltwater events Cordilleran Ice Sheet 550 550 Earth sciences and geology ddc:550 Dissertation doctoralThesis 2014 ftsubbremen 2022-11-09T07:09:25Z Deglacial variations in upper ocean nutrient dynamics and stratification in high latitudes, as well as associated changes in thermohaline overturning circulation, are thought to have played a key role in changing atmospheric CO2 concentrations. This thesis examines the relationship between past changes in subarctic Pacific upper ocean stratification and nutrient (silicic acid) utilization, using oxygen and silicon stable isotopes of diatom silica, for the first time at millennial-scale resolution and analyzed with a new and efficient instrumentation set-up. The isotopic data, presented in three manuscripts, show a consistent picture of millennial-scale variability in upper ocean stratification and silicic acid utilization during the last ~50 ka BP, e.g. indicating that the subarctic Pacific was a source region for atmospheric CO2 during the last deglaciation (late Heinrich Stadial 1 and the Bølling/Allerød). The presented results demonstrate the high potential of combined diatom oxygen and silicon stable isotope analysis especially for, but not restricted to, marine regions characterized by a low biogenic carbonate content like the subarctic Pacific and the Southern Ocean. Doctoral or Postdoctoral Thesis Ice Sheet Southern Ocean Subarctic Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) Southern Ocean Pacific |
institution |
Open Polar |
collection |
Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) |
op_collection_id |
ftsubbremen |
language |
English |
topic |
diatom silica silicon isotopes oxygen isotopes termination 1 Last Glacial Holocene surface water stratification nutrient utilization meltwater events Cordilleran Ice Sheet 550 550 Earth sciences and geology ddc:550 |
spellingShingle |
diatom silica silicon isotopes oxygen isotopes termination 1 Last Glacial Holocene surface water stratification nutrient utilization meltwater events Cordilleran Ice Sheet 550 550 Earth sciences and geology ddc:550 Maier, Edith Oxygen and Silicon Stable Isotopes of Diatom Silica: Reconstructing Changes in Surface Water Hydrography and Silicic Acid Utilization in the Late Pleistocene Subarctic Pacific |
topic_facet |
diatom silica silicon isotopes oxygen isotopes termination 1 Last Glacial Holocene surface water stratification nutrient utilization meltwater events Cordilleran Ice Sheet 550 550 Earth sciences and geology ddc:550 |
description |
Deglacial variations in upper ocean nutrient dynamics and stratification in high latitudes, as well as associated changes in thermohaline overturning circulation, are thought to have played a key role in changing atmospheric CO2 concentrations. This thesis examines the relationship between past changes in subarctic Pacific upper ocean stratification and nutrient (silicic acid) utilization, using oxygen and silicon stable isotopes of diatom silica, for the first time at millennial-scale resolution and analyzed with a new and efficient instrumentation set-up. The isotopic data, presented in three manuscripts, show a consistent picture of millennial-scale variability in upper ocean stratification and silicic acid utilization during the last ~50 ka BP, e.g. indicating that the subarctic Pacific was a source region for atmospheric CO2 during the last deglaciation (late Heinrich Stadial 1 and the Bølling/Allerød). The presented results demonstrate the high potential of combined diatom oxygen and silicon stable isotope analysis especially for, but not restricted to, marine regions characterized by a low biogenic carbonate content like the subarctic Pacific and the Southern Ocean. |
author2 |
Tiedemann, Ralf Bohrmann, Gerhard |
format |
Doctoral or Postdoctoral Thesis |
author |
Maier, Edith |
author_facet |
Maier, Edith |
author_sort |
Maier, Edith |
title |
Oxygen and Silicon Stable Isotopes of Diatom Silica: Reconstructing Changes in Surface Water Hydrography and Silicic Acid Utilization in the Late Pleistocene Subarctic Pacific |
title_short |
Oxygen and Silicon Stable Isotopes of Diatom Silica: Reconstructing Changes in Surface Water Hydrography and Silicic Acid Utilization in the Late Pleistocene Subarctic Pacific |
title_full |
Oxygen and Silicon Stable Isotopes of Diatom Silica: Reconstructing Changes in Surface Water Hydrography and Silicic Acid Utilization in the Late Pleistocene Subarctic Pacific |
title_fullStr |
Oxygen and Silicon Stable Isotopes of Diatom Silica: Reconstructing Changes in Surface Water Hydrography and Silicic Acid Utilization in the Late Pleistocene Subarctic Pacific |
title_full_unstemmed |
Oxygen and Silicon Stable Isotopes of Diatom Silica: Reconstructing Changes in Surface Water Hydrography and Silicic Acid Utilization in the Late Pleistocene Subarctic Pacific |
title_sort |
oxygen and silicon stable isotopes of diatom silica: reconstructing changes in surface water hydrography and silicic acid utilization in the late pleistocene subarctic pacific |
publisher |
Universität Bremen |
publishDate |
2014 |
url |
https://media.suub.uni-bremen.de/handle/elib/700 https://nbn-resolving.org/urn:nbn:de:gbv:46-00103890-18 |
geographic |
Southern Ocean Pacific |
geographic_facet |
Southern Ocean Pacific |
genre |
Ice Sheet Southern Ocean Subarctic |
genre_facet |
Ice Sheet Southern Ocean Subarctic |
op_relation |
https://media.suub.uni-bremen.de/handle/elib/700 urn:nbn:de:gbv:46-00103890-18 |
op_rights |
info:eu-repo/semantics/openAccess Bitte wählen Sie eine Lizenz aus: (Unsere Empfehlung: CC-BY) |
op_rightsnorm |
CC-BY |
_version_ |
1766031590655262720 |