Logo des Repositoriums
Zur Startseite
  • English
  • Deutsch
Anmelden
  1. Startseite
  2. SuUB
  3. Dissertationen
  4. Natural variation of pelagic carbonate production during Cenozoic warm periods
 
Zitierlink DOI
10.26092/elib/2651

Natural variation of pelagic carbonate production during Cenozoic warm periods

Veröffentlichungsdatum
2023-03-03
Autoren
CORNUAULT, Pauline  
Betreuer
Kucera, Michal  
Gutachter
Edgar, Kirsty  
Zusammenfassung
The biological carbon uptake, called biological compensation, have been shown to have a huge potential to affect the capacity of the ocean to absorb (anthropogenic) carbon dioxide, and so equilibrate the global carbon budget and hence climate. Since the pelagic calcite flux is made of two fundamentally different components, coccolithophore algae and planktonic foraminifera, understanding of the process of biological compensation requires knowledge of variability of their relative contribution to the total pelagic calcite flux. The aspects of the pelagic carbonate production that have changed through time and the mechanisms explaining the observed carbonate flux variability remain, despite their importance, largely unconstrained. In order to evaluate the orbital and long geological time scale variability of the pelagic carbonate production, I generated new high-resolution records of carbonate accumulation rate, using marine sediments deposited in the equatorial Atlantic Ocean (Ceará Rise) at ODP Site 927, across four warm climates intervals ranging from the Neogene to the Quaternary. I find that the relative contribution of the two groups to the total pelagic carbonate production remains relatively constant on long geological time scales, shows a high orbital time scale variability (factor of two), and is not driving the changes in total pelagic carbonate production.
I conclude that at the studied location, the main driver of the pelagic carbonate changes, for both the planktonic foraminifera and the coccoliths were changes in population growth, with a shift in the composition of the communities. The observed dominant periodicities in carbonate accumulation rate indicate that the two groups responded to local changes in factors affecting their productivity, rather than to global climate modulations. On both time scales, the observed changes were large enough to affect the marine inorganic carbon cycle and thus the ocean’s capacity to absorb inorganic carbon.
Schlagwörter
climate variability

; 

carbonate production

; 

paleoceanography

; 

warm climates

; 

microfossils

; 

Cenozoic
Institution
Universität Bremen  
Fachbereich
Fachbereich 05: Geowissenschaften (FB 05)  
Researchdata link
https://doi.org/10.1594/PANGAEA.945848
https://doi.org/10.1594/PANGAEA.945773
https://doi.org/10.1594/PANGAEA.945812
https://doi.org/10.1594/PANGAEA.945789
https://doi.org/10.1594/PANGAEA.945707
Dokumenttyp
Dissertation
Lizenz
https://creativecommons.org/licenses/by/4.0/
Sprache
Englisch
Dateien
Lade...
Vorschaubild
Name

PhD_thesis_PaulineCornuault_corrected_3Nov2023.pdf

Size

12.26 MB

Format

Adobe PDF

Checksum

(MD5):a108d987ba48df1084315409a8b1ee15

Built with DSpace-CRIS software - Extension maintained and optimized by 4Science

  • Datenschutzbestimmungen
  • Endnutzervereinbarung
  • Feedback schicken