System Maintenance Notice

Please note that maintenance work is scheduled between 4 AM and 5 AM - CET. During this time, you may experience reduced performance. Thanks for your patience.

Publications

Journal Article Ppublish

PubMed: 42455891 DOI: 10.1126/sciadv.aea0455

Global biosphere productivity response to Atlantic Meridional Overturning Circulation collapse during Heinrich Stadial 4.

Sci Adv 12(29):eaea0455

Authors: Ji-Woong Yang, Jean-Baptiste Ladant, Thomas Blunier, Amaëlle Landais, Masa Kageyama, Didier Paillard, Nicolas Viovy, Pascale Braconnot, María Fernanda Sánchez Goñi, Frédéric Prié, Sébastien Nguyen, Louise Crinella-Morici

Affiliations

  • Laboratoire des Sciences du Climat et de l'Environnement (LSCE, UMR 8212), CEA, CNRS, Université de Versailles Saint-Quentin-en-Yvelines, Université Paris-Saclay, 91191 Gif-sur-Yvette, France. Institut Pierre-Simon Laplace (IPSL), 78280 Guyancourt, France. Physics of Ice, Climate, and Earth, Niels Bohr Institute, University of Copenhagen, 2200 Copenhagen, Denmark.
  • Laboratoire des Sciences du Climat et de l'Environnement (LSCE, UMR 8212), CEA, CNRS, Université de Versailles Saint-Quentin-en-Yvelines, Université Paris-Saclay, 91191 Gif-sur-Yvette, France.
  • Institut Pierre-Simon Laplace (IPSL), 78280 Guyancourt, France.
  • Physics of Ice, Climate, and Earth, Niels Bohr Institute, University of Copenhagen, 2200 Copenhagen, Denmark.
  • Laboratoire des Sciences du Climat et de l'Environnement (LSCE, UMR 8212), CEA, CNRS, Université de Versailles Saint-Quentin-en-Yvelines, Université Paris-Saclay, 91191 Gif-sur-Yvette, France. Institut Pierre-Simon Laplace (IPSL), 78280 Guyancourt, France.
  • Environnements et Paléoenvironnements Océaniques et Continentaux, Université de Bordeaux, EPHE, Université PSL, CNRS, 33614 Pessac, France.

Abstract

The slowdown of the Atlantic Meridional Overturning Circulation (AMOC) due to ongoing climate change raises concerns about its impact on the global carbon cycle. Understanding how global biosphere productivity may respond to such changes is essential for predicting the future carbon cycle, yet quantifying past global biosphere productivity remains challenging. We use triple isotope composition of air oxygen ( 17Δ) trapped in polar ice cores to reconstruct the global biosphere productivity over the period 40.5 to 38.6 thousand years before the present (ka B.P.), covering Heinrich Stadial 4, a period of weakened AMOC. Our data reveal a slight increase in productivity following a carbon dioxide (CO 2) rise around 39.5 ka B.P. Freshwater hosing experiments using a global climate model indicate that the CO 2 fertilization effect on the terrestrial biosphere offsets productivity decline caused by consequences of AMOC slowdown. Collectively, our results suggest that global biosphere productivity slightly increases in response to AMOC slowdown and accompanying changes.

MeSH

Climate