The relative importance of the factors contributing to Arctic spring sea ice decline remains an open question. Here we suggest a new major factor. In spring the North Pacific Gyre Oscillation (NPGO) shows a significantly increasing trend during 1998–2016, in contrast to the insignificant trend of the Pacific Decadal Oscillation (PDO) index. Nearly 40% of Arctic springtime sea ice concentration trend is statistically related to the increase of the NPGO index but only 4% to the PDO trend. Through the destructive linear interference with climatological Aleutian low, the increasing NPGO index tends to weaken the upward propagation of planetary waves, which enhances the strength of the stratospheric Arctic vortex and the Arctic Oscillation (AO). The positive AO anomalies influence the surface wind field and temperature pattern anomalies, contributing to negative sea ice anomalies in the Arctic.

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1998-2016年间北太平洋回旋涛动与春季北极海冰的流失密切相关

导致北极春季海冰减少的因素的相对重要性仍然是一个悬而未决的问题。在这里，我们建议一个新的主要因素。春季，北太平洋涡旋振荡（NPGO）在1998-2016年期间显示出显着增加的趋势，而太平洋十进制振荡（PDO）指数的趋势则微不足道。从统计上看，北极春季春季海冰浓度趋势中有将近40％与NPGO指数的增加有关，而与PDO趋势仅有4％的关系。通过对气候阿留申低点的破坏性线性干扰，不断增加的NPGO指数往往会减弱行星波的向上传播，从而增强平流层北极涡旋和北极涛动（AO）的强度​​。正AO异常会影响表面风场和温度模式异常，