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Volume 9
Issue 5
10.3390/aerospace9050231
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Article
Peer-Review Record

Case Study for Testing the Validity of NOx-Ozone Algorithmic Climate Change Functions for Optimising Flight Trajectories

Aerospace 2022, 9(5), 231; https://doi.org/10.3390/aerospace9050231
by Pratik Rao 1,*, Feijia Yin 1, Volker Grewe 1,2, Hiroshi Yamashita 2, Patrick Jöckel 2, Sigrun Matthes 2, Mariano Mertens 2 and Christine Frömming 2
Reviewer 1: Anonymous
Reviewer 2: Anonymous
Aerospace 2022, 9(5), 231; https://doi.org/10.3390/aerospace9050231
Submission received: 3 March 2022 / Revised: 8 April 2022 / Accepted: 16 April 2022 / Published: 22 April 2022
(This article belongs to the Special Issue Aircraft Emissions and Climate Impact)

Round 1

Reviewer 1 Report

  1. Overall a very good paper on a challenging issue of reducing emissions from aviation sector.
  2. Only the result of vertical analysis in a summer days looks promising.  
  3. The study only covers European air space- it would be good to extend to look at North-Atlantic region and beyond (Asia) to look at impacts on transcontinental air routes.
  4. More elaboration of practical application of the research findings necessary - even though the paper concludes with "climate-optimised flight planning could be practically
    feasible". 

Author Response

We would like to thank you for your time spent on reviewing the manuscript and providing useful feedback. We took into account these comments wherever possible in the revision. We provide a point-by-point reply to each comment; please see the attachment.

Author Response File: Author Response.pdf

Reviewer 2 Report

This paper is focused on accessing the effectiveness of aircraft trajectory optimization strategy based on the O3 algorithmic climate change functions on the aviation climate impact. The paper is well written and the study can be very helpful to reduce aviation-induced climate impact. My comments to further improve the study are as follows: 

Could the authors also compare the travel time (i.e., arrival delays) between the cost-optimized and climate-optimized trajectories?

Could the authors show some typical horizontal and vertical climate-optimized trajectories? Would it be possible for pilots and operators to follow these trajectories?

In Table 5, why does the Nox emission turn out to be higher for climate-optimized trajectories?

Author Response

We would like to thank you for the time spent on reviewing the manuscript and providing useful feedback. We took into account these comments wherever possible in the revision. We provide a point-by-point reply to each comment; please see the attachment. 

Author Response File: Author Response.pdf

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