Alfredo Martínez-García

Nov 13, 2024 | mdpi.com | Alfredo Martínez-García |Ivanovich Estrada-Guel |Xóchitl Atanacio-Sánchez |Carlos Gamaliel Garay-Reyes

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Mar 27, 2024 | nature.com | Frank Lamy |Gisela Winckler |Helge W. Arz |Jesse Farmer |Julia Gottschalk |Lester Lembke-Jene | +18 more

AbstractThe Antarctic Circumpolar Current (ACC) represents the world’s largest ocean-current system and affects global ocean circulation, climate and Antarctic ice-sheet stability1,2,3. Today, ACC dynamics are controlled by atmospheric forcing, oceanic density gradients and eddy activity4. Whereas palaeoceanographic reconstructions exhibit regional heterogeneity in ACC position and strength over Pleistocene glacial–interglacial cycles5,6,7,8, the long-term evolution of the ACC is poorly known.

Jan 29, 2024 | nature.com | Xuyuan E. Ai |Lena Thöle |Simone Moretti |Anja S. Studer |Daniel M. Sigman |Alfredo Martínez-García

AbstractPrevious studies suggest that meridional migrations of the Antarctic Circumpolar Current may have altered wind-driven upwelling and carbon dioxide degassing in the Southern Ocean during past climate transitions. Here, we report a quantitative and continuous record of the Antarctic Circumpolar Current latitude over the last glacial-interglacial cycle, using biomarker-based reconstructions of surface layer temperature gradient in the southern Indian Ocean.

Aug 25, 2023 | nature.com | Elan Levy |Hubert Vonhof |Alfredo Martínez-García |Shira Raveh-Rubin |Gal Yasur

AbstractThere is limited understanding of temperature and atmospheric circulation changes that accompany an Atlantic Meridional Overturning Circulation (AMOC) slowdown beyond the North Atlantic realm. A Peqi’in Cave (Israel) speleothem dated to the last interglacial period (LIG), 129–116 thousand years ago (ka), together with a large modern rainfall monitoring dataset, serve as the base for investigating past AMOC slowdown effects on the Eastern Mediterranean.