09 Oct 2023
 | 09 Oct 2023
Status: this preprint is open for discussion and under review for Climate of the Past (CP).

Mechanisms of Global Ocean Ventilation Age Change during the Last Deglaciation

Lingwei Li, Zhengyu Liu, Jinbo Du, Lingfeng Wan, and Jiuyou Lu

Abstract. 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. 

Lingwei Li et al.

Status: open (until 10 Jan 2024)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-2256', Anonymous Referee #1, 08 Nov 2023 reply
  • RC2: 'Review of egusphere-2023-2256 by Lingwei Li et al.', Anonymous Referee #2, 23 Nov 2023 reply

Lingwei Li et al.

Lingwei Li et al.


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Short summary
Radiocarbon proxies suggest that the deep waters are poorly ventilated, with the old ventilation age, during the Last Glacial Maximum (LGM). Here we use two transient simulations with tracers of radiocarbon and ideal age to show that the deep water ventilation age is not old at the LGM because of the strong Antarctic Bottom Water transport. In contrast, the ventilation age is older during deglaciation, especially in the deep Pacific, mainly caused by reduced transport of Antarctic Bottom Water.