TY -的A2 Flocas海伦娜a . AU -陈Yongren AU -李,乐清市PY - 2019 DA - 2019/05/15 TI -分析深秋的暴雨在四川盆地东部的青藏高原SP - 8797368六世- 2019 AB -异常暴雨发生在2014年10月27日在四川盆地(某人),中国进行了分析。倒低点850 hPa演变成一个中国西南涡(SWCV),和强劲的向上运动引起的低空急流之间的交互(LLJ) 850 hPa上层喷气(ULJ) 200 hPa引发暴雨过程。在大规模的循环系统以西风槽和亚热带高,有两个云乐队在东北,青藏高原南部。影响eastward-moving槽、倒槽LLJ, SWCV,中尺度对流系统(MCS)生成交界处附近的两个云带,它是直接暴雨系统。MCS加强的情况下850 hPa倒槽,但削弱时倒槽SWCV进化。最终,形成这种现象被称为“现有涡没有云。“通过分析可能的原因降水加强(减弱)的情况下倒槽(SWCV),发现加强降水是由于强大的倾斜上升气流ULJ的面积和LLJ十字路口。一方面,向上运动的涡度平流变化有关身高和低层暖平流迫使;而另一方面,附近的露点锋LLJ也起到了提升作用下层流向朝上的垂直环流。与此同时,LLJ“头”是水蒸气的高价值区域融合,这为暴雨提供了充足的水汽。 During the SWCV, the weakening of precipitation was due to the SWCV weakening gradually; plus, the ULJ was interrupted over the SB, the upper airflow presented downdrafts, and its superposition with the ascending branch of low-level vertical circulation. This airflow structure inhibited the development of strong upward motion, whilst at the same time, the LLJ retreated toward the south and the dew-point front ultimately weakened and disappeared. Subsequently, water vapor convergence weakened and no longer supported the occurrence of heavy rainfall. Therefore, the strong upward motion caused by the ULJ-LLJ intersection and the lower-level dew-point front were the key reasons for the occurrence of this late-autumn rainstorm. SN - 1687-9309 UR - https://doi.org/10.1155/2019/8797368 DO - 10.1155/2019/8797368 JF - Advances in Meteorology PB - Hindawi KW - ER -