The role of North Pacific teleconnection in the sea level change of the Canadian Basin

This study utilizes sea surface height (SSH) measurements from the CryoSat-2 satellite mission (2011–2020) to demonstrate the ​​significant influence of the North Pacific Oscillation (NPO)​​ on linking Pacific Ocean dynamics with sea level variability in the Canadian Basin. Results reveal a ​​pronounced positive correlation between JJA NPO phases and SSH anomalies (SSHAs)​​ in the Canadian Basin. During positive NPO phases, anomalous anticyclonic circulation intensifies over the Arctic, strengthening the Beaufort High. This atmospheric forcing drives ​​enhanced freshwater transport from the Bering Sea to the Canadian Basin via the Bering Strait, thereby elevating local SSHAs. To extend the analysis beyond the observational period, the ​​Community Earth System Model Version 2 Large Ensemble (CESM2-LE)​​ is employed to simulate this North Pacific teleconnection mechanism driving Canadian Basin sea level variability from ​​1960 to 2100​​. The CESM2-LE results corroborate the ​​positive NPO–SSHA relationship during 2011–2020. ​​North Pacific pre-winter SST anomalies constitute a robust precursor​​ for summer Canadian Basin SSH variability. These findings underscore a ​​critical teleconnection pathway​​ through which North Pacific SST variability modulates Arctic sea levels—a mechanism essential for refining future climate projections and regional sea level risk assessments. 研究基于2011–2020年的CryoSat-2卫星观测数据, 揭示了夏季北太平洋遥相关(NPO)与加拿大海盆的海表面高度异常(SSHA)之间存在显著的正相关关系.当NPO处于正位相时, 北极上空异常的反气旋式环流增强, 加强了波弗特高压.这种大气强迫使得从白令海向加拿大海盆输送的淡水通量增加, 从而抬升了局地SSHA.此外, 北太平洋前冬的海表温度(SST)异常, 可以作为预测后续夏季加拿大海盆海平面变化的一个有效“先兆”指标.这为提前预测北极海平面变化提供了可能性.