Barents-Kara sea-ice decline attributed to surface warming in the Gulf Stream

Yoko Yamagami, Masahiro Watanabe, Masato Mori, Jun Ono

研究成果: ジャーナルへの寄稿学術誌査読

12 被引用数 (Scopus)

抄録

Decline in winter sea-ice concentration (SIC) in the Barents-Kara Sea significantly impacts climate through increased heat release to the atmosphere. However, the past Barents-Kara SIC decrease rate is underestimated in the majority of Coupled Model Intercomparison Project Phase 6 (CMIP6) climate models. Here we show that climate model simulations can reproduce the Barents-Kara SIC trend for 1970–2017 when sea surface temperature (SST) variability in the Gulf Stream region is constrained by observations. The constrained warming of the Gulf Stream strengthens ocean heat transport to the Barents-Kara Sea that enhances the SIC decline. The linear trends between the SIC and SST are highly correlated in the CMIP6 ensemble, suggesting that the externally forced component of the Gulf Stream SST increase explains up to 56% of the forced Barents-Kara SIC trend. Therefore, future warming of the Gulf Stream can be an essential pacemaker of the SIC decline.

本文言語英語
論文番号3767
ジャーナルNature communications
13
1
DOI
出版ステータス出版済み - 12月 2022

!!!All Science Journal Classification (ASJC) codes

  • 化学一般
  • 生化学、遺伝学、分子生物学一般
  • 物理学および天文学一般

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