Millennial-scale atmospheric CO2 variations during the Marine Isotope Stage 6

The main objective of this thesis is to understand the millennial variability of atmospheric CO2 during the Marine Isotope Stage 6 (MIS 6), the penultimate glacial, period (185─135 kyr BP). During the early MIS 6 period (185-160 kyr BP), 6 millennial-scale climate oscillations can be observed in pro...

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Main Author: Shin, Jinhwa
Other Authors: Institut des Géosciences de l’Environnement (IGE), Institut de Recherche pour le Développement (IRD)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 ), Université Grenoble Alpes, Jérôme Chappellaz, Frédéric Parrenin
Format: Doctoral or Postdoctoral Thesis
Language:French
Published: HAL CCSD 2019
Subjects:
Online Access:https://theses.hal.science/tel-02171720
https://theses.hal.science/tel-02171720/document
https://theses.hal.science/tel-02171720/file/SHIN_2019_diffusion.pdf
id ftunigrenoble:oai:HAL:tel-02171720v1
record_format openpolar
spelling ftunigrenoble:oai:HAL:tel-02171720v1 2024-05-12T07:55:37+00:00 Millennial-scale atmospheric CO2 variations during the Marine Isotope Stage 6 Variations atmosphériques du CO2 à l'échelle millénaire durant le stade isotopique MIS 6 Shin, Jinhwa Institut des Géosciences de l’Environnement (IGE) Institut de Recherche pour le Développement (IRD)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 ) Université Grenoble Alpes Jérôme Chappellaz Frédéric Parrenin 2019-03-18 https://theses.hal.science/tel-02171720 https://theses.hal.science/tel-02171720/document https://theses.hal.science/tel-02171720/file/SHIN_2019_diffusion.pdf fr fre HAL CCSD NNT: 2019GREAU006 tel-02171720 https://theses.hal.science/tel-02171720 https://theses.hal.science/tel-02171720/document https://theses.hal.science/tel-02171720/file/SHIN_2019_diffusion.pdf info:eu-repo/semantics/OpenAccess https://theses.hal.science/tel-02171720 Sciences de la Terre. Université Grenoble Alpes, 2019. Français. ⟨NNT : 2019GREAU006⟩ Ice-Core Paloe-Climate Atmospheric CO2 Carottes de glace Paleo-Climat CO2 atmosphérique [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/doctoralThesis Theses 2019 ftunigrenoble 2024-04-18T03:43:30Z The main objective of this thesis is to understand the millennial variability of atmospheric CO2 during the Marine Isotope Stage 6 (MIS 6), the penultimate glacial, period (185─135 kyr BP). During the early MIS 6 period (185-160 kyr BP), 6 millennial-scale climate oscillations can be observed in proxy records of Antarctic temperature, the bipolar see-saw phenomenon in the North Atlantic region, and Monsoon intensity in low latitudes. An intensified hydrological cycle and iceberg calving in the North Atlantic may have impacted on the Atlantic Meridional Overturning Circulation during MIS 6 (Margari et al., 2010). Atmospheric CO2 reconstructions from Antarctic ice cores can provide key information on how atmospheric CO2 concentrations are linked to millennial-scale climate changes. However, existing CO2 records from the Vostok ice core do not show the millennial variability due to the lack of suitable temporal resolution and precision. To understand atmospheric CO2 variability during MIS 6, a precision of less than 2 ppm is mandatory, because there is a possibility that we could observe small CO2 variability of less than 5 ppm during the smaller Antarctic isotope maxima events as observed during the last glacial period (Ahn and Brook, 2014; Bereiter et al., 2012).To investigate how atmospheric CO2 is related with climate change on millennial time scales during MIS 6, we reconstructed 150 samples of atmospheric CO2 data from the EPICA Dome C (EDC) ice core during the MIS 6 period (189.4─135.4 kyr BP). One minor and five major variabilities of atmospheric CO2 during the early MIS 6 period (189─160 kyr BP) were found. These variabilities are highly matched with Antarctic temperature. During the short stadials in the North Atlantic, atmospheric CO2 variations are negligible and decoupled with temperature variations in Dome C. During this period, the strength of upwelling in the southern ocean might not be sufficient to impact on atmospheric CO2. In addition, 2 modes of CO2 variations are present in the MIS 6 period. ... Doctoral or Postdoctoral Thesis Antarc* Antarctic EPICA ice core Iceberg* North Atlantic Southern Ocean Université Grenoble Alpes: HAL Antarctic Southern Ocean
institution Open Polar
collection Université Grenoble Alpes: HAL
op_collection_id ftunigrenoble
language French
topic Ice-Core
Paloe-Climate
Atmospheric CO2
Carottes de glace
Paleo-Climat
CO2 atmosphérique
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences
spellingShingle Ice-Core
Paloe-Climate
Atmospheric CO2
Carottes de glace
Paleo-Climat
CO2 atmosphérique
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences
Shin, Jinhwa
Millennial-scale atmospheric CO2 variations during the Marine Isotope Stage 6
topic_facet Ice-Core
Paloe-Climate
Atmospheric CO2
Carottes de glace
Paleo-Climat
CO2 atmosphérique
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences
description The main objective of this thesis is to understand the millennial variability of atmospheric CO2 during the Marine Isotope Stage 6 (MIS 6), the penultimate glacial, period (185─135 kyr BP). During the early MIS 6 period (185-160 kyr BP), 6 millennial-scale climate oscillations can be observed in proxy records of Antarctic temperature, the bipolar see-saw phenomenon in the North Atlantic region, and Monsoon intensity in low latitudes. An intensified hydrological cycle and iceberg calving in the North Atlantic may have impacted on the Atlantic Meridional Overturning Circulation during MIS 6 (Margari et al., 2010). Atmospheric CO2 reconstructions from Antarctic ice cores can provide key information on how atmospheric CO2 concentrations are linked to millennial-scale climate changes. However, existing CO2 records from the Vostok ice core do not show the millennial variability due to the lack of suitable temporal resolution and precision. To understand atmospheric CO2 variability during MIS 6, a precision of less than 2 ppm is mandatory, because there is a possibility that we could observe small CO2 variability of less than 5 ppm during the smaller Antarctic isotope maxima events as observed during the last glacial period (Ahn and Brook, 2014; Bereiter et al., 2012).To investigate how atmospheric CO2 is related with climate change on millennial time scales during MIS 6, we reconstructed 150 samples of atmospheric CO2 data from the EPICA Dome C (EDC) ice core during the MIS 6 period (189.4─135.4 kyr BP). One minor and five major variabilities of atmospheric CO2 during the early MIS 6 period (189─160 kyr BP) were found. These variabilities are highly matched with Antarctic temperature. During the short stadials in the North Atlantic, atmospheric CO2 variations are negligible and decoupled with temperature variations in Dome C. During this period, the strength of upwelling in the southern ocean might not be sufficient to impact on atmospheric CO2. In addition, 2 modes of CO2 variations are present in the MIS 6 period. ...
author2 Institut des Géosciences de l’Environnement (IGE)
Institut de Recherche pour le Développement (IRD)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 )
Université Grenoble Alpes
Jérôme Chappellaz
Frédéric Parrenin
format Doctoral or Postdoctoral Thesis
author Shin, Jinhwa
author_facet Shin, Jinhwa
author_sort Shin, Jinhwa
title Millennial-scale atmospheric CO2 variations during the Marine Isotope Stage 6
title_short Millennial-scale atmospheric CO2 variations during the Marine Isotope Stage 6
title_full Millennial-scale atmospheric CO2 variations during the Marine Isotope Stage 6
title_fullStr Millennial-scale atmospheric CO2 variations during the Marine Isotope Stage 6
title_full_unstemmed Millennial-scale atmospheric CO2 variations during the Marine Isotope Stage 6
title_sort millennial-scale atmospheric co2 variations during the marine isotope stage 6
publisher HAL CCSD
publishDate 2019
url https://theses.hal.science/tel-02171720
https://theses.hal.science/tel-02171720/document
https://theses.hal.science/tel-02171720/file/SHIN_2019_diffusion.pdf
geographic Antarctic
Southern Ocean
geographic_facet Antarctic
Southern Ocean
genre Antarc*
Antarctic
EPICA
ice core
Iceberg*
North Atlantic
Southern Ocean
genre_facet Antarc*
Antarctic
EPICA
ice core
Iceberg*
North Atlantic
Southern Ocean
op_source https://theses.hal.science/tel-02171720
Sciences de la Terre. Université Grenoble Alpes, 2019. Français. ⟨NNT : 2019GREAU006⟩
op_relation NNT: 2019GREAU006
tel-02171720
https://theses.hal.science/tel-02171720
https://theses.hal.science/tel-02171720/document
https://theses.hal.science/tel-02171720/file/SHIN_2019_diffusion.pdf
op_rights info:eu-repo/semantics/OpenAccess
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