Especially, t-test shows that significance of the Asia polar vortex, zonal circulation index, the most northern extension edge of subtropical high of Northern West Pacific and the warm pool of Pacific Ocean, are at 95% (90%) .

• 特别地，亚洲极涡、纬向环流指数、西太平洋副热带高压北界位置及太平洋暖池的海表面温度等因子均通过了95%25（90%25）信度水平检验。