Ice front retreat reconfigures meltwater-driven gyres modulating ocean heat delivery to an Antarctic ice shelf

Seung-Tae Yoon, Won Sang Lee*, SungHyun Nam*, Choon-Ki Lee, Sukyoung Yun, Karen Heywood, Lars Boehme, Yixi Zheng, Inhee Lee, Yeon Choi, Adrian Jenkins, Emilia Kyung Jin, Robert Larter, Julia Wellner, Pierre Dutrieux, Alexander T. Bradley

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Pine Island Ice Shelf (PIIS) buttresses the Pine Island Glacier, the key contributor to sea-level rise. PIIS has thinned owing to ocean-driven melting, and its calving front has retreated, leading to buttressing loss. PIIS melting depends primarily on the thermocline variability in its front. Furthermore, local ocean circulation shifts adjust heat transport within Pine Island Bay (PIB), yet oceanic processes underlying the ice front retreat remain unclear. Here, we report a PIB double-gyre that moves with the PIIS calving front and hypothesise that it controls ocean heat input towards PIIS. Glacial melt generates cyclonic and anticyclonic gyres near and off PIIS, and meltwater outflows converge into the anticyclonic gyre with a deep-convex-downward thermocline. The double-gyre migrated eastward as the calving front retreated, placing the anticyclonic gyre over a shallow seafloor ridge, reducing the ocean heat input towards PIIS. Reconfigurations of meltwater-driven gyres associated with moving ice boundaries might be crucial in modulating ocean heat delivery to glacial ice.
Original languageEnglish
Article number306
Pages (from-to)108
Number of pages8
JournalNature Communications
Volume13
Issue number1
DOIs
Publication statusPublished - 13 Jan 2022

Fingerprint

Dive into the research topics of 'Ice front retreat reconfigures meltwater-driven gyres modulating ocean heat delivery to an Antarctic ice shelf'. Together they form a unique fingerprint.

Cite this