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中文摘要：
利用NCEP/NCAR的月平均再分析资料以及中国国家气候中心的西太平洋副热带高压（副高）强度资料,分析了西太平洋副高强度、500hPa环流场以及东亚地表感热、潜热通量场的年代际变化特征,发现各个季节的西太平洋副高强度及其环流形势均存在一定的年代际变化,变化发生的时间为1978年前后,20世纪70年代中期以后副高强度有所增强。副高强度在季节间的延续性也发生了一定的年代际变化,1978年以后季节间的延续性增强,全时段的延续性受后一时段的影响较大。东亚地表感热、潜热通量场也存在明显的年代际变化,感热通量的变化关键区在大陆上,主要为青藏高原东、西部,其发生年代际变化要早于西太平洋副高强度变化的时间（20世纪60年代中后期）,但它们发生差异变化的时间则接近西太平洋副高强度发生年代际变化的时间,在20世纪60年代中后期以前,高原感热通量体现为稳定的西高东低,而20世纪70年代中期以后则转为稳定的东高西低,其中,近10年时间为调整过渡期,因此,它们各自的年代际变化所造成的影响会有所滞后。潜热通量的变化关键区则位于海洋上,主要是西太平洋地区,1978年以前春季地表潜热通量距平为南正北负,之后转为南负北正,而夏季潜热通量距平则普遍由正转负,春夏季潜热通量的年代际变化与同期西太平洋副高强度的年代际变化有着较好的对应关系。地表热通量与西太平洋副高强度之间的关系不受各自年代际变化的影响。
英文摘要：
The interdecadal variation of intensity of the western Pacific subtropical high（WPSH） during the period 1951-2001 is studied by using data from the National Climate Center（NCC）,China Meteorological Administration.The characteristics of the circulations at 500 hPa and the surface heat flux over East Asia are also analyzed based on the NCEP/NCAR monthly reanalysis data.The results reveal that the WPSH and the circulations exhibit interdecadal variations around 1978,with enhancing intensities.The interseasonal persistence of the WPSH intensity alters correspondingly to some extent,which is more significant during 1978-2001 than during 1951-1978.The surface heat flux over East Asia also displays a remarkable interdecadal variation,which leads that of the WPSH intensity.The key variation areas of the surface sensible heat flux（SSHF） are mainly located over the eastern and western Tibetan Plateau around the late 1960s.However,the difference of the SSHF between the eastern and western Plateau exhibits a change in the mid 1970s,close to the time of the abrupt climate change of the WPSH intensity.The SSHF of the Plateau stably increases in the west and decreases in the east before the mid-late 1960s,while it stably increases in the east and decreases in the west after the mid-1970s.On the other hand,the key variation area of the surface latent heat flux（SLHF） is mainly situated over the West Pacific（WP）,where the SLHF anomaly in spring changes from positive to negative in the south before 1978,but from negative to positive in the north after 1978;while in summer it turns from positive to negative all over the WP after 1978.The interdecadal variation of SLHF in both spring and summer corresponds well to the interdecadal variation of the WPSH intensity in the same season.The notable correlation between the WPSH intensity and SSHF（or SLHF） maintains without any change although each of these qnantities varies on the interdecadal scale.
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