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| A new method to identify mixing layer height based on logistic curve |
| ZHU Yu-lei1, NI Chang-jian1,2, TAN Qin-wen3, WANG Yuan-cheng3 |
1. College of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu 610225, China;
2. Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, Chengdu 610225, China;
3. Chengdu Environmental Monitoring Centre, Chengdu 610072, China |
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Abstract Based on the analysis of the Mie scattering lidar in Chengdu from June 2013 to February 2014, it is shown that there are three layers near the top of the mixing layer of the atmospheric extinction coefficient from bottom to top, the significant decreasing layer, the overall slow transformation layer and the transition layer between the two. Using the logistic curve to fit the variation characteristics of the extinction coefficient, a new method to identify the mixing layer height is proposed by calculating the height of the curve's maximum curvature. The idea of the method accords with the definition of the mixing layer which is below the discontinuous interface of the turbulence characteristics. In addition, the results of the new method are not only consistent with the mixing layer height obtained by sounding curve, but also strongly related to the variation of fine particulate mass concentration.
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Received: 19 October 2016
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