中文摘要：

现在的学习在在由使用的西北中国上的理智的热流动驻扎的春天和夏天的 interdecadal 可变性调查差别从 1960 ～ 2000 的观察。这被发现在西北中国上的理智的热流动是的春天在到 1990 年代的从 1970 年代末的时期期间更大比在到 mid-1970s 的从 1960 年代的时期期间。夏天理智的热流动比它在通过 1980 年代初的 1970 年代的在通过 1990 年代的 1980 年代末是更小的。春天和夏天在西北中国上的地对空的温度差别在 1970 年代末显示了明显的 interdecadal 增加。春天和夏天表面风速度经历了在 1970 年代末变弱的明显的 interdecadal。处于表面风速度的变化在夏天期间在理智的热流动在 interdecadal 变化起了一个更重要的作用，而处于地对空的温度差别的变化为在在春天的理智的热流动的 interdecadal 变化是更重要的。这差别与处于吝啬的地对空的温度差别和表面风速度的季节的变化有关。进一步的分析显示春天的增加在西北中国打表面温度与表面网放射的增加有关。

英文摘要：

The present study investigates the difference in interdecadal variability of the spring and summer sensible heat fluxes over Northwest China by using station observations from 1960 to 2000. It was found that the spring sensible heat flux over Northwest China was greater during the period from the late 1970s to the 1990s than during the period from the 1960s to the mid-1970s. The summer sensible heat flux was smaller in the late 1980s through the 1990s than it was in the 1970s through the early 1980s. Both the spring and summer land-air temperature differences over Northwest China displayed an obvious interdecadal increase in the late 1970s. Both the spring and summer surface wind speeds experienced an obvious interdecadal weakening in the late 1970s. The change in the surface wind speed played a more important role in the interdecadal variations in sensible heat flux during the summer, whereas the change in the land-air temperature difference was more important for the interdecadal variations in sensible heat flux in the spring. This difference was related to seasonal changes in the mean land-air temperature difference and the surface wind speed. Further analysis indicated that the increase in the spring land surface temperature in Northwest China was related to an increase in surface net radiation.