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  Global biosphere productivity changes during Heinrich Stadial 4: Preliminary results from the triple O2 isotopes and coupled climate model simulations

Yang, J.-W., Ladant, J.-B., Landais, A., Blunier, T., Kageyama, M., Jaccard, S., Duchamp-Alphonse, S., Sánchez Goñi, M. F., Prié, F. (2023): Global biosphere productivity changes during Heinrich Stadial 4: Preliminary results from the triple O2 isotopes and coupled climate model simulations, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-2465

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018287 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018287_2
Genre: Conference Paper

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 Creators:
Yang, Ji-Woong1, Author
Ladant, Jean-Baptiste1, Author
Landais, Amaëlle1, Author
Blunier, Thomas1, Author
Kageyama, Masa1, Author
Jaccard, Samuel1, Author
Duchamp-Alphonse, Stéphanie1, Author
Sánchez Goñi, María Fernanda1, Author
Prié, Frédéric1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 Abstract: The last glacial period was punctuated by a number of transient events during which massive iceberg discharges profoundly perturbed the deep ocean circulation dynamics, causing widespread climate and environmental changes. Detailed analysis of polar ice cores demonstrated millennial-scale atmospheric CO2 variations characterized by rapid shifts between relatively cold (stadial) and warm (interstadial) stages and in particular, a gradual rising of CO2 during Heinrich Stadials (HS). To date, the observed CO2 increase during HS has been attributed to ventilation changes in Southern Ocean, and/or reduced biological uptake. However, understanding the respective contribution of ocean ventilation and changes in the efficiency of the biological carbon pump is challenging because of difficulties in estimating global biosphere productivity based on local reconstructions as they are often based on indirect geochemical tracers and exhibit spatial heterogeneities. To address this, we measured the triple isotopic composition of air oxygen in trapped air in NEEM ice core samples and reconstructed the global biosphere productivity over the ~42 to ~37 ka interval. Our preliminary results indicate no clear evidence of significant reduction of global biosphere productivity during HS4, inconsistent with some paleoproductivity indicators such as European pollen assemblages, Antarctic ice-core non-sea-salt Na and Ca, or marine sediment core opal flux records from sub-Antarctic zone of Southern Ocean. In order to disentangle current disagreement between local- to global estimate of biological productivity, we will present the first results from novel simulations using the IPSL-CM5A2 coupled climate model forced by 40 ka climate configurations with new ice-sheet reconstructions.

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Language(s): eng - English
 Dates: 2023
 Publication Status: Finally published
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 Identifiers: DOI: 10.57757/IUGG23-2465
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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Place of Event: Berlin
Start-/End Date: 2023-07-11 - 2023-07-20

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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Source Genre: Proceedings
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Publ. Info: Potsdam : GFZ German Research Centre for Geosciences
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: - Identifier: -