Atlantic circulation changes across a stadial-interstadial transition

• DOI: 10.5194/cp-2022-83
• Publication Date: 2022-11-15T07:06:45Z
• Authors: Claire Waelbroeck; Jerry Tjiputra; Chuncheng Guo; Kerim H. Nisancioglu; Eystein Jansen; Natalia Vazquez R...; Samuel Toucanne; Frédérique Eynaud; Linda Rossignol; Fabien Dewilde; Elodie Marchès; Susana Lebreiro; Silvia Nave
• Keywords: Stadial; Last Glacial Maximum

Abstract. We combine consistently dated benthic carbon isotopic records distributed over the entire Atlantic Ocean with numerical simulations performed by a glacial configuration of Norwegian Earth System Model active ocean biogeochemistry, in order to interpret observed Cibicides δ13C changes at stadial-interstadial transition corresponding end Heinrich Stadial 4 (HS4) terms circulation and remineralization changes. show that marked increase HS4 between ~2000 4200 m can be explained nutrient concentrations as simulated model response halting freshwater input high latitude North Atlantic. Our results this signal is associated ratio southern-sourced (SSW) versus northern-sourced (NSW) water masses core sites, whereby SSW replaced NSW consequence resumption deep formation northern Nordic Seas after halted. further suggest contribution increases from ~40 % 2000 ~80 4000 m. Below ~4200 m, shows little change but an across marking HS4. The lower during stadials than interstadials particularly pronounced subantarctic agreement decrease export production Southern found previous studies.