中文摘要：

从 1981～2013 在5月10月期间在中国把数据和 2474 个车站的 降水数据基于时代过渡期间，横向砍线( TSL )被识别，并且他们有在到它的东方的西藏的高原和这个区域上的奔流的降雨事件的气候的特征和协会统计上在北方的夏天期间被分析，基于三个标准：南方带的风，相对涡度，和带的风的零根轮廓线砍。TSL 通常是西方东方，在西藏的高原上被发现面向，与在在 10 月的 6 月，和最少的出现的最高的出现频率。TSL 的高频率轴，平行到西藏的高原的地面，从 5 月向南方的移动到 8 月，然后稍微向北方从 9 月到 10 月。年度平均 TSL 频率是 65.3 天，并且有 TSL 的明显的 interannual 和 interdecal 变化。TSL 频率的年度变化在 1980 年代是很不同的，由 2000 年代列在后面，与平均频率出现在 1995-2000 期间。TSL 和在西藏的高原上的重降雨事件的出现频率在 1981-2013 期间是稳定的，这被发现。然而，源于 TSL 的重降雨事件的出现频率正在减少。超过 50% TSL 能导致重降雨，当 40% 重降雨事件被 TSL 引起时。TSL 是仔细与在在西藏的高原上的 6 月 8 月的泛滥的季节的重降雨有关。

英文摘要：

Based on ERA-Interim data and precipitation data of 2474 stations in China during May-October from 1981 to 2013, transverse shear lines （TSLs） were identified, and their climatic characteristics and association with torrential rainfall events over the Tibetan Plateau and the region to its east during boreal summer were analyzed statistically, based on three criteria： the meridional shear of zonal wind, the relative vorticity, and the zero contour line of zonal wind. It was found that TSLs are generally west east oriented over the Tibetan Plateau, with the highest occurrence frequency in June, and least occurrence in October. The high frequency axis of TSLs, parallel to the terrain of the Tibetan Plateau, shifts southward from May to August, and then slightly northward from September to October. The annual average TSL frequency is 65.3 days, and there are obvious interannual and interdecal variations of TSLs. The annual fluctuation of TSL frequency is most distinct in the 1980s, followed by the 2000s, with average frequency appearing during 1995 2000. It was found that the occurrence frequency of TSLs and that of heavy rainfall events over the Tibetan Plateau are stable during 1981-2013. However, the occurrence frequency of the heavy rainfall events resulting from TSLs is decreasing. More than 50% of the TSLs can lead to heavy rainfall, while 40% of the heavy rainfall events are caused by TSLs. TSLs are closely related to heavy rainfalls in the flooding season of June-August over the Tibetan Plateau.