Please find my comments/suggestions/questions in the attached file. 

This manuscript evaluates two different automatic methods to determine the Mixing Layer Height (MLH) by a MicroPulse differential absorption lidar (MPD), and provides a detailed comparison to other methods derived from Radiosonde, Doppler wind lidar and a weather model. Three case studies and a time series comparison are presented to demonstrate the capabilities of both methods. These studies elaborate the differences in MLH results of the used methods in detail and highlight their pro and cons.  

The results of this study will significantly contribute to enhance the capabilities of automatic MLH retrieval network on an automatic basis. They allow for improvements of the existing worldwide MLH retrieval networks by a new method combination using the DIAL and HSRL technique.  

The paper is well structured and written in excellent English. The figures are clear and well described.

I recommend the paper for publication as it is.

Just some technical corrections/questions: 

• How many days were finally used for the time series comparison? Please indicate a number.
• Will the MPD lidar be commercially available soon for the community?