The Kuroshio extension (KE) exhibits interdecadal variability, oscillating from a stable state to an unstable state. In this paper, ERA-Interim reanalysis data are used to discuss the possible reasons for the asymmetric response of the atmosphere to symmetric sea surface temperature anomaly (SSTA) during periods of differential KE states. The analysis has the following results: the SSTA presents a nearly symmetrical distribution with opposite signs during the KE stable and unstable periods. During the KE stable period, the storm track is located north of 40°N and is significantly enhanced in the northeast Pacific Ocean. The atmospheric response is similar to the West Pacific/North Pacific Oscillation teleconnection (WP/NPO like pattern) and presents a barotropic structure. The inversion results of the potential vorticity equation show that the feedback of transient eddy vorticity manifests a WP/NPO like pattern and presents a barotropic structure, which is the main reason for bringing about the response of the WP/NPO like pattern. The magnitude of the feedbacks of both diabatic heating and transient eddy heating is small, which can offset one another. During the KE unstable period, the main body of the storm track is located to the south of 40°N, and there is no significant response signal in the atmosphere, except near the west coast of North America. Compared with the KE stable period, the asymmetry of response of the transient eddy vorticity is the main reason for the asymmetric response of the atmosphere.

黑潮延伸（KE）表现出年代际变化，从稳定状态向不稳定状态振荡。在本文中，使用ERA-Interim重新分析数据讨论了在差分KE状态期间，大气对对称海表温度异常（SSTA）的不对称响应的可能原因。分析得出以下结果：在KE稳定和不稳定期间，SSTA呈现出具有相反符号的近乎对称的分布。在KE稳定时期，风暴路径位于40°N以北，并且在东北太平洋大幅度增强。大气响应类似于西太平洋/北太平洋涛动遥相关（类似WP / NPO的模式），并呈现出正压构造。潜在涡度方程的反演结果表明，瞬态涡旋涡的反馈表现为WP / NPO样模式并呈现正压结构，这是引起WP / NPO样模式响应的主要原因。绝热加热和瞬时涡流加热的反馈量很小，可以相互抵消。在KE不稳定时期，风暴路径的主体位于40°N以南，除了北美西海岸附近，大气中没有明显的响应信号。与KE稳定期相比，瞬态涡旋响应的不对称性是大气响应不对称的主要原因。这是导致WP / NPO类模式响应的主要原因。绝热加热和瞬时涡流加热的反馈量很小，可以相互抵消。在KE不稳定时期，风暴路径的主体位于40°N以南，除了北美西海岸附近，大气中没有明显的响应信号。与KE稳定期相比，瞬态涡旋响应的不对称性是大气响应不对称的主要原因。这是导致WP / NPO类模式响应的主要原因。绝热加热和瞬时涡流加热的反馈量很小，可以相互抵消。在KE不稳定时期，暴风道的主体位于40°N以南，除了北美西海岸附近，大气中没有明显的响应信号。与KE稳定期相比，瞬态涡旋响应的不对称性是大气响应不对称的主要原因。风暴轨迹的主体位于40°N以南，除了北美西海岸附近，大气中没有明显的响应信号。与KE稳定期相比，瞬态涡旋响应的不对称性是大气响应不对称的主要原因。风暴轨迹的主体位于40°N以南，除了北美西海岸附近，大气中没有明显的响应信号。与KE稳定期相比，瞬态涡旋响应的不对称性是大气响应不对称的主要原因。