太行山东部两次典型酸雨天气过程对比分析

针对太行山东部地区2008年4月出现的2次酸雨天气过程,利用表征大气热力和动力学物理量对其进行分析,结果表明:弱酸雨天气太行山区为强盛的上升运动所控制,上升运动可达200 hPa,致酸污染物可通过垂直运动向外扩散。强酸雨天气中低层为下沉运动,抑制了污染物的扩散。强酸雨区域处于850 hPa全风速的最大值轴线的右前方,该处为下沉气流控制,不利于致酸污染物的扩散。两次酸雨过程低层均为对流性不稳定,但强酸雨日假相当位温垂直变率明显小于弱酸雨日垂直变率,且中高层与弱酸雨日相比为稳定性层结。

Comparative Analysis of Two Typical Acid Rain Weather Processes in the Eastern of Taihang Mountain

By using atmospheric thermal and dynamic physical quantities, two times acid rain weather processes appeared in April 2008 in the eastern of the Taihang Mountain are analyzed, the results show that Taihang Mountain area in the vertical direction is controlled by the strong upward motion in the weak acid rain weather, and it is up to 200 hPa, acid-causing pollutants can be spread out through the vertical movement. The middle and lower level of strong acid rain weather is downward motion, inhibiting the spread of pollutants. Strong acid rain area is in the right frontage of wind speed maximum axis at 850 hPa, which is controlled by downward motion, and is not conducive to the proliferation of acid-causing pollutants. There is convective instability in the low-level for the two acid rain processes, but the vertical variability of the pseudo-equivalent potential temperature in strong acid rain days was significantly smaller than that in weak acid rain days, and atmospheric stratification in middle and higher level in strong acid rain days is more stable than that in weak acid rain days.