冷涡前部飞机人工增雨作业条件数值模拟研究

Numerical Simulation Study on Artificial Precipitation Enhancement Operation under the Background of Cold Vortex

利用中尺度数值模式WRF-ARW(V3.6)结合实测资料对2015年6月6日大兴安岭林区增雨作业条件进行研究,从不同尺度分析了天气条件、云宏微观条件,完善飞机人工增雨作业指标体系,进而为冷涡背景下的人工增雨作业提供一定的科学依据。研究表明:此次过程受贝加尔湖以东冷涡的影响,6日08时冷涡中心位于蒙古国与中国内蒙古东部交界处,黑龙江省西部处于涡前部偏南气流中,水汽条件良好;08—16时涡旋云系前部分布于黑龙江省西部地区,云系整体向东北方向缓慢移动,云层较厚,云顶温度在-30^-15℃,过冷层厚度为4~5 km,云中过冷水分布较丰沛,含量在0.01~0.5 g/m^(3),大值区主要分布在2 900~4 000 m,具备良好的增雨作业云条件。

Based on the mesoscale numerical model WRF-ARW(V3.6) and the observation data,this paper studied the operating conditions of artificial rainfall in Daxinganling forest area on June 6 th,2015.The weather conditions and cloud macro and micro conditions at different scales were analyzed to improve the index system of aircraft precipitation modification,thus providing a scientific basis for the operation of precipitation modification under the background of cold vortex. Results show that the cold vortex is the main synoptic system impacting artificial rainfall,the process was affected by the cold vortex east of the Baikal Lake,the cold vortex center was located at the eastern border of Mongolia and Inner Mongolia of China at 08:00 BT on June 6 th,the western region of Heilongjiang Province was in the southward flow of the low vortex where the vapor conditions were good. From 08:00 to 16:00,the former part of the vortex cloud system was distributed in the western region of Heilongjiang province,and the cloud system as a whole moved slowly to the northeast.The thickness of the cold layer is 4 ~5 km,and the distribution of supercooled water in the cloud is abundant with high cloudiness,the temperature of the cloud top varies from-30 ℃ to-15 ℃. The supercooled layer was characterized by a significant thickness from 4 to 5 kilometer with an abundance of supercooled water with a general content of 0.01 ~ 0.5 g/m^(3). The large value area was mainly distributed at 2 900~ 4 000 m. It has good cloud conditions for rain enhancement operation.