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气溶胶质量浓度垂直分布反演模型的研究
Study on retrieval model for vertical distribution of aerosol mass concentration
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摘要: 激光雷达监测气溶胶垂直分布一直是大气环境监测领域的重要内容之一。为了研究大气气溶胶质量浓度的垂直分布,对气溶胶质量浓度反演模型进行了理论分析和实验验证。在理论分析后向散射系数与质量浓度之间指数关系及气象因子对气溶胶质量浓度分布影响的基础上提出了一种指数修正模型。采用非线性最小二乘法与经验相结合的方法进行了实验验证,获得了模型参量并反演了气溶胶质量浓度的垂直分布。结果表明,修正模型与实际情况更接近,能更好地反映气象因子对气溶胶质量浓度分布的影响,该修正模型对于气溶胶的垂直分布研究具有一定的参考价值。Abstract: Monitoring the vertical distribution of the aerosol with lidar is one of the focuses in the environment monitoring field.In order to study the vertical distribution of the air aerosol,a model to retrieve aerosol mass concentration was analyzed theoretic;aHy and proved experimentally.A modified model was presented based on exponent model and analysis of influence of the meteorological factors upon aerosol mass concentration.With the method of nonlinear least squares and some experience,some key parameters of the model and the vertical distribution of mass concentration can be retrieved.Conclusions are drawn as follows; the modified model can satisfactorily reflect the influence of meteorological factors upon aerosol mass concentration;the retrieved results consist with measured values.The results may be regarded as a reference to the research in this field.
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Key words:
- laser technique /
- lidar /
- retrieval /
- aerosol mass concentration /
- vertical distribution /
- meteorological factors
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