| 王一颉,赵桂香.吕梁山两次夜间暴雨的边界层特征及能量来源与转换[J].沙漠与绿洲气象,2024,18(2):35~43 |
| 吕梁山两次夜间暴雨的边界层特征及能量来源与转换 |
| Boundary Layer Characteristics, Energy Sources and Conversion of Two Night Rainstorms in Lvliang Mountain |
| 投稿时间：2023-02-21 修订日期：2023-03-24 |
| DOI： |
| 中文关键词: 夜间暴雨 中尺度对流系统 边界层 短时强降水 能量转换 |
| 英文关键词:night rainstorm mesoscale convective system boundary layer short-time heavy precipitation energy conversion |
| 基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目），山西省科技厅面上项目 |
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| 中文摘要: |
| 利用常规观测、NCEP/NCAR 1°×1°再分析、风云2E卫星数据等资料，对分别由MβECS和MCC造成的两次吕梁山夜间暴雨过程进行数值模拟和粒子后向轨迹追踪，得到以下结论：过程1受边界层南风急流和西南气流影响，山西西部低空急流偏西分量和晋中盆地边界层西南气流的增强是对流不稳定能量重建的重要因子。过程2则受边界层南风和东风急流作用，前者被显著抬升到对流层中高层，形成含有冰晶层的中高层云系，后者则供应了低空水汽。两次过程中边界层（0.8～1.2 km）粒子携带的水汽均明显超过了低层（1.5～3 km），是夜间短时强降水所需水汽的最大贡献者。700 hPa及以上非绝热作用产生扰动有效位能、之后向扰动动能的转化是两次过程中短时强降水发生所需能量的主要来源。 |
| 英文摘要: |
| Using the conventional observations, NCEP/NCAR 1°×1° reanalysis and FY-2E satellite data, two night torrential rain processes caused respectively by MβECs and MCC in Lvliang Mountain were simulated, and the backward trajectorys of the particles were tracked. The conclusion is as follows: The first process is affected by southerly jet and southwest airflow in the boundary layer. The westerly component of low-level jet in western Shanxi and the enhancement of southwest airflow in Jinzhong Basin are important reasons for the reconstruction of convective instability energy. In the second process, the boundary layer southerly jet is significantly lifted, forming clouds containing ice crystals in the middle and upper layer, while the easterly jet supplies the water vapor in minimum altitude. In both processes, the water vapor carried by particles in the boundary layer (0.8~1.2 km) obviously exceeds that in the low-level layer (1.5~3 km). The diabatic process above 700 hPa produces the perturbative available potential energy, whose conversion to perturbative kinetic energy is the main source of energy needed by short-time heavy precipitation in both processes. |
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