Mesoscale convective systems (MCSs) often cause heavy precipitation events during the warm season over the Tibetan Plateau (TP). By using the 1‐hr gridded data sets with the resolution of 0.1° × 0.1° from the geostationary satellites of Fengyun‐2 series (FY‐2C/2E), the characteristics of MCSs over the TP during the warm season (May–August) from 2005 to 2012 are analysed. Based on objective criteria, MCSs over the TP can be divided into six categories, namely mesoscale convection complexes (MCCs), persistent elongated convection systems (PECSs), meso‐β circular convection systems (M_βCCSs), meso‐β elongated convection systems (M_βECSs), smaller meso‐β circular convection systems (SM_βCCSs), as well as smaller meso‐β elongated convection systems (SM_βECSs). The results show that there are 1,465 MCSs occurring over the TP during the warm seasons of 2005–2012, and most MCSs occur in a banded area around 30°N with two high‐frequency centres. The frequency of MCSs reaches a maximum in July, followed by August and June, while the lowest frequency occurs in May. The high‐frequency centre is located in the northern part of the TP in May, and moves southward to the central and southern part of the TP from June to August. 82.3% of the MCSs over the TP belong to the elongated categories, out of which M_βECSs account for the most. MCSs over the TP have significant diurnal variations, which usually initiate at around 1700 LST (LST, LST = UTC + 8 hr), then develop and reach maturity at 2000 LST, then weaken and dissipate at 2200 LST. The life cycles of MCSs are characterized by slow growth and rapid weakening. The larger the scale of MCSs over the TP is, the longer the duration will be.

中文翻译：

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基于FY-2卫星数据集的青藏高原暖季中尺度对流系统特征

中尺度对流系统（MCSs）通常在青藏高原（TP）暖季期间引起大量降水事件。通过使用来自风云2系列（FY-2C / 2E）对地静止卫星的分辨率为0.1°×0.1°的1小时网格数据集，在暖季（5月至8月）期间TP上的MCS的特征）从2005年到2012年进行了分析。基于客观标准，MCS的过TP可分为6类，即尺度对流复合体（MCC），持久性细长对流系统（PECSs），内消旋- β圆形对流系统（M _β的CCS），内消旋- β细长对流系统（M _β ECSS），更小的内消旋- β圆形对流系统（SM _β的CCS），以及较小的内消旋- β细长对流系统（SM _βECS）。结果表明，在2005–2012年的暖季期间，TP上发生了1,465个MCS，大多数MCS发生在30°N附近的带状区域，有两个高频中心。MCS的频率在7月达到最高，其次是8月和6月，而最低的频率发生在5月。高频中心在5月位于TP的北部，从6月至8月向南移动到TP的中部和南部。TP上82.3％的MCS属于拉长类别，其中_MβECS最多。TP上的MCS有明显的昼夜变化，通常在1700 LST（LST，LST = UTC + 8 hr）开始，然后在2000 LST发育并达到成熟，然后在2200 LST减弱并消散。MCSs的生命周期特征是生长缓慢和快速减弱。TP上的MCS规模越大，持续时间将越长。