Dear authors,

I am sorry to inform you that once again a revisions of your manuscript is necessary before publication in ACP. One of the referees was not satisfied with your response and revisions so far. I can understand the criticism of the referee.

I think the major problem is that you present here only one data set and for a rather short time period (~10 years) that make trend estimates generally quite difficult. Thus, I can understand the request of the referee that the uncertainties need to be better discussed. Also the observed changes need to be better explained.

You could add a discussion section and provide a thorough discussion of your results and uncertainties as well as reasons for the observed trend in the mesosphere. The conclusions are quite short and some of the arguments provided in the introduction could be repeated here in more detail.

Best regards, Farahnaz Khosrawi

Dear authors,

I am pleased to inform you that your paper is accepted for publication in ACP after consideration of some technical corrections:

Please increase the figures/font size of the newly added figures 1 to 3. In their current version the text is hardly readable.

Best regards, Farahnaz Khosrawi