Abrupt climate changes in the last two deglaciations simulated with different Northern ice sheet discharge and insolation ...

• Main Authors: Obase, Takashi, Abe-Ouchi, Ayako, Saito, Fuyuki
• Format: Conference Object
• Language: unknown
• Published: GFZ German Research Centre for Geosciences 2023
• Subjects: Antarctic; Antarc*; Ice Sheet
• Online Access: https://dx.doi.org/10.57757/iugg23-1393; https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017208

<!--!introduction!--> There were significant differences between the last two deglaciations, particularly in Atlantic Meridional Overturning Circulation (AMOC) and Antarctic warming in the deglaciations and the following interglacials. Here, we present transient simulations of deglaciation using a coupled atmosphere–ocean general circulation model for the last two deglaciations focusing on the impact of ice sheet discharge on climate changes associated with the AMOC in the first part, and the sensitivity studies using a Northern Hemisphere ice sheet model in the second part. We show that a set of abrupt climate changes of the last deglaciation, including Bolling–Allerod warming, the Younger Dryas, and onset of the Holocene were simulated with gradual changes of both ice sheet discharge and radiative forcing. On the other hand, penultimate deglaciation, with the abrupt climate change only at the beginning of the last interglacial was simulated when the ice sheet discharge was greater than in the last ... : The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) ...