依据四川省内GPS数据研究垂直分层方法对层析结果的影响及大气水汽随着高程变化的特点，提出一种垂直不均匀分层方法。与垂直均匀分层进行对比实验，不均匀分层的层析结果与探空水汽结果更吻合。由于水汽主要集中在对流层中低层，对流层低层的垂直分辨率相对较高，采用垂直不均匀分层方法得到的大气水汽的变化特征更加细致。考虑到水汽分布的不均匀特点，认为垂直不均匀分层更符合大气水汽的实际分布。四川地区的水汽层析实验研究结果表明文中提出的垂直不均匀分层方法可行且有效。%The effects of the ways of vertical stratification on the tomographic results are studied with the GPS data of Sichuan region .A non-uniform vertical stratification method is proposed based on atmospheric characteristics of refractive index with elevation changes .Experimental results show the water vapor density profiles solved by the non-uniform vertical stratification tomography is better than the uniform vertical stratification ,which is more consistent with the sounding vapor density profile .Taking into account the fact that the vapor mainly concentrates in the lower troposphere ,the lower troposphere has relatively high vertical resolution w hile uneven vertical stratification is applied ,w hich is better to reflect the variation of atmospheric water vapor in the lower troposphere and more detailed characterized changes in atmospheric water vapor .The results of water vapor tomographic experiments in the Sichuan region show that uneven vertical stratification method proposed is feasible and effective .
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