摘要
本文根据实际风暴中所观测到的电参数,考虑雷暴内电荷区为圆柱轴对称体,分别计算了切变风暴和砧体风暴内各电荷区的垂直电涡度时间变化率。结果表明:在切变风暴内由电场力所产生的垂直涡度时间变率为10^(-7)—10^(-8)/s^2,是一个可以和动力垂直涡度时间变率相比拟的量,其数值在云下部较大,随高度增加而减小。电能在雷暴中下层。在砧体风暴中结果基本相同,只是数值约小一个量级。同时说明,云内带电水成物粒子在电场力作用下所发生的对流运动可以形成水平旋转气流,电环流是一个重要因子。
Basing on electric parameters measured in actual storms and considering that charges distribute along a axial symmetry cylinder, in this paper the changing rate of vertical electric vorticity with time in shear and anvil storms are calculated respectively. The result indicates that the rate of vertical electric vorticity variation with time caused by electric field force is about the order of 10-7—10-8/s2, which can be matched with the changing rate of vertical dynamic vorticity. The magnitude is the largest at storm bottom and with increase of height decreases. The electric energy concentrates mainly in middle and low layer of storm. The result is same as in anvil storms, but the magnitude is a order smaller. Meanwhile , the result also indicates that the convective motion of charged hydrometer particals due to electric field force can form horizontal vortox of air current. The electric circulation is an important factor.
出处
《高原气象》
CSCD
北大核心
1991年第3期293-304,共12页
Plateau Meteorology
关键词
对流
风暴
大气
电涡度
时间变率
Convective storm
Electric vorticity variability with time
Convective motion.
