Thanks Mark and Morten for taking the time to reply.
I have been able to download the document, and I think I will consider MCP on alpha for future projects, it looks very interesting. For this project, I ended up using an alpha from the mast measurements since seasonality was affecting lidar's alpha. Then, for verification, I compared the wind speed obtained at 120 m with the speed measured by lidar at 120 m for the same reference period.
Thanks again,
Kind regards,
Inés