Mechanisms of Global Ocean Ventilation Age Change during the Last Deglaciation

Marine radiocarbon (14C) is widely used to trace deep ocean circulation, providing insight into the atmosphere-ocean exchange of CO2 during the last deglaciation. Using two transient simulations with tracers of 14C and ideal age, we found that the oldest ventilation age is not observed at the Last G...

Full description

Bibliographic Details
Main Authors: Li, Lingwei, Liu, Zhengyu, Du, Jinbo, Wan, Lingfeng, Lu, Jiuyou
Format: Article in Journal/Newspaper
Language:English
Published: Copernicus Publications 2023
Subjects:
article
Verlagsveröffentlichung
Antarctic
Pacific
Antarc*
Sea ice
Online Access:https://doi.org/10.5194/egusphere-2023-2256
https://noa.gwlb.de/receive/cop_mods_00069206
https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00067603/egusphere-2023-2256.pdf
https://egusphere.copernicus.org/preprints/2023/egusphere-2023-2256/egusphere-2023-2256.pdf
Description
Summary:Marine radiocarbon (14C) is widely used to trace deep ocean circulation, providing insight into the atmosphere-ocean exchange of CO2 during the last deglaciation. Using two transient simulations with tracers of 14C and ideal age, we found that the oldest ventilation age is not observed at the Last Glacial Maximum (LGM). In contrast, the model shows a modestly younger ventilation age during the LGM compared to present day, mainly due to a stronger glacial Antarctic Bottom Water (AABW) transport associated with sea ice expansion. Notably, the ocean ventilation age is significantly older around 14–12 ka compared to the age at the LGM, with deep Pacific waters playing a predominant role, primarily caused by the weakening of AABW transport.

Similar Items