Role of the Drake Passage in the asymmetric warming between the Arctic and the Antarctic ...

• Main Authors: Wang, Peixi, Hu, Xiaoming, Yang, Song, Li, Zhenning, Song, Zhaoyang
• Format: Conference Object
• Language: unknown
• Published: GFZ German Research Centre for Geosciences 2023
• Subjects: Arctic; Antarctic; The Antarctic; Drake Passage; Antarc*; Sea ice
• Online Access: https://dx.doi.org/10.57757/iugg23-2568; https://gfzpublic.gfz-potsdam.de/pubman/item/item_5019327

<!--!introduction!--> Both observations and model simulations reveal that the Arctic warms faster than the Antarctic. Previous studies have emphasized that the weaker warming in the Antarctic is due to the northward energy transport by the Antarctic Circumpolar Circulation (ACC). However, few studies have attempted to consider the asymmetric surface warming between the Arctic and the Antarctic and understand the root of this asymmetric warming. To reveal the role of ACC in the asymmetric warming, we close the Drake Passage (DP) to perturb the ocean circulations in the fully coupled Community Earth System Model. Experiments driven by an abrupt CO 2 doubling show that compared to the DP opened case, the asymmetric polar warming amplifies in the DP closed case. The amplified asymmetry partially originates in a climatological warmer Antarctic with less sea ice but a colder Arctic with more sea ice in the DP closed case, resulting from climatological weaker ACC and Atlantic Meridional Overturning ... : The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) ...