Fluctuating Atlantic inflows modulate Arctic atlantification

• 成果类型: Article
• 署名作者: Polyakov, Igor V.; Ingvaldsen, Randi B.; Pnyushkov, Andrey V.; Bhatt, Uma S.; Francis, Jennifer A.; Janout, Markus; Kwok, Ronald; Skagseth, Ostein
• 署名单位: University of Alaska System; University of Alaska Fairbanks; University of Alaska System; University of Alaska Fairbanks; Institute of Marine Research - Norway; University of Alaska System; University of Alaska Fairbanks; Helmholtz Association; Alfred Wegener Institute, Helmholtz Centre for Polar & Marine Research; University of Washington; University of Washington Seattle; Bjerknes Centre for Climate Research
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-13904
• DOI: 10.1126/science.adh5158
• 发表日期: 2023-09-01
• 页码: 972-979
• 关键词: sea-ice; barents sea; eurasian basin; ocean; water; temperature; variability; transport; heat; anomalies

摘要

Enhanced warm, salty subarctic inflows drive high-latitude atlantification, which weakens oceanic stratification, amplifies heat fluxes, and reduces sea ice. In this work, we show that the atmospheric Arctic Dipole (AD) associated with anticyclonic winds over North America and cyclonic winds over Eurasia modulates inflows from the North Atlantic across the Nordic Seas. The alternating AD phases create a switchgear mechanism. From 2007 to 2021, this switchgear mechanism weakened northward inflows and enhanced sea-ice export across Fram Strait and increased inflows throughout the Barents Sea. By favoring stronger Arctic Ocean circulation, transferring freshwater into the Amerasian Basin, boosting stratification, and lowering oceanic heat fluxes there after 2007, AD+ contributed to slowing sea-ice loss. A transition to an AD- phase may accelerate the Arctic sea-ice decline, which would further change the Arctic climate system.