Based on the daily ERA-Interim reanalysis, interactions between the winter North Pacific storm track (WNPST) and the East Asian trough (EAT) on the interannual scale are further explored from the perspective of energy conversion and the simplified quasi-geostrophic potential vorticity equation. There is a prominent out-of-phase relationship between the EAT and WNPST on the interannual scale. It is baroclinic energy conversion rather than barotropic energy conversion that is the main physical process that the EAT affects the WNPST. When the EAT is intensified, the energy conversion from mean available potential energy to eddy available potential energy decreases; further, the energy conversion from eddy available potential energy to eddy kinetic energy is attenuated, which leads directly to remarkable weakening in the strength of the WNPST in its peak area and the region west of the date line. In addition, when the WNPST is enhanced, the WNPST dynamic forcing contributes to lowering the geopotential height near the EAT and thus profits to recover the strength of the EAT, while the thermal forcing of WNPST is opposite. However, their joint effect is still to strengthen the EAT, indicating that the impact of WNPST dynamic forcing on the EAT is stronger than that of thermal forcing. The interaction between the WNPST and EAT may be a way for the WNPST to maintain itself.

基于每日ERA-中期分析，从能量转换和简化的准地转势涡度方程的角度，进一步探讨了冬季北太平洋风暴道（WNPST）和东亚海槽（EAT）在年际尺度上的相互作用。 。在年际尺度上，EAT和WNPST之间存在明显的异相关系。EAT影响WNPST的主要物理过程是斜压能量转换而不是正压能量转换。当强化EAT时，从平均可用势能到涡流可用势能的能量转换会减少；此外，从涡流可用势能到涡流动能的能量转换被衰减，这直接导致WNPST在峰值区域和日期线以西区域的强度显着减弱。另外，当增强WNPST时，WNPST的动态强迫有助于降低EAT附近的地势高度，从而有利于恢复EAT的强度，而WNPST的热强迫则相反。但是，它们的共同作用仍然是加强EAT，这表明WNPST动态强迫对EAT的影响要强于热强迫。WNPST和EAT之间的交互可能是WNPST维护自身的一种方式。而WNPST的热强迫则相反。但是，它们的共同作用仍然是加强EAT，这表明WNPST动态强迫对EAT的影响要强于热强迫。WNPST和EAT之间的交互可能是WNPST维护自身的一种方式。而WNPST的热强迫则相反。但是，它们的共同作用仍然是加强EAT，这表明WNPST动态强迫对EAT的影响要强于热强迫。WNPST和EAT之间的交互可能是WNPST维护自身的一种方式。