三维对流云对大气光化学组分的再分布作用及其化学效应

摘要

A three-dimensional model of hailstorms coupled with chemistry transport module is used to simulate the redistribution of photochemical species due to cloud transport, then the cloud chemistry box model is used to study the disturbance of atmospheric chemistry system owing to the change of gas concentration caused by cloud transport. The results show that the O3 concentrations following cloud transport are higher than those in cloudless cases, however, during 2-day period, their variable trends have no great difference. The concentrations of NO2, NO3, HNO3, PAN are much higher than in cloudless cases, increasing by 70%, 62%, 87% and 49% respectively, in which the increase of NO2 is owing to cloud transport, the increases of NO3, HNO3, PAN result from the disturbance of transport to the chemistry system. The concentrations of OH, HO2 increase by 13% and 11%, respectively, compared with cloudless cases in two days.%利用一个三维的冰雹云模式与化学组分输送模块耦合，得到云输送引起大气光化学组分的再分布，然后用一个包含详细气相化学反应机制的箱模式研究了云输送引起的气相体积分数的变化及其对大气化学系统产生的影响。结果表明，云输送后O3体积分数大于无云个例，但其后两天内两者的变化趋势相差不大；HNO3、NO2、NO3、PAN等的体积分数均明显高于无云个例，分别增长了87％、70％、62％和49％，其中NO2体积分数的增加主要由于云输送造成，而NO3、HNO3、PAN主要是输送对化学扰动的结果。两天内OH和HO2自由基体积分数比无云个例平均增长了13％和11％。