The WRF-Chem model was used to simulate the vertical transport of atmospheric composition during deep convection over Beijing and its surrounding areas on 21 Jul 2012.The study quantified the contribution of the deep convective system to the redistribution of atmospheric composition with different solubilities.Comparison with Microwave Limb Sounder(MLS)measurements showed that the model simulation accurately reproduced the distribution of CO and O3 during deep convection.The time and altitude cross-section of CO,O3,SO2,and NH3 demonstrated that deep convection could transport gases with different solubilities to the upper troposphere and even into the lower stratosphere.In the upper troposphere,the volume concentration of low-solubility gas CO increased from 70 ppb(1 ppb=10-9)to 111 ppb during the convection,representing a 58.6%increase.Conversely,O3 decreased from 220 ppb to 102 ppb,showing a 53.6%decrease.For high-solubility gases,SO2 and NH3 concentrations increased from 0.036 ppb and 0.011 ppb in the preconvection to 0.4 ppb and 0.15 ppb by volume during the convection,with percentage increases of 1011.1%and 1263.6%,respectively.
关键词
大气成分/气体溶解度/深对流/垂直输送
Key words
Atmospheric composition/Gas solubility/Deep convection/Vertical transport
维普
万方数据