Dear Authors

Your paper is suitable for publication in ACP with minor revisions requested by one of the reviewers (reported below).

I would encourage you to incorporate these remarks in your final version of the manuscript

Kind regards,

Federico Fierli

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Review of the revised paper "The southern stratospheric gravity-wave hot spot: individual waves and their momentum fluxes measured by COSMIC GPS-RO" by N. P. Hindley et al.

I think the authors did a great job. After revision the paper is much improved now. Most of my concerns have been adequately addressed. There are only two minor points and some technical comments that should be addressed before publication in ACP.

For details see below. Pages and line numbers refer to the manuscript version without tracked changes.




Minor comments:

(1) p.13, l.5 / specific comment 7 in my previous review:
In addition to the theoretical considerations given in the manuscript, it should be mentioned that the presence of shorter vertical wavelengths in the region of interest is supported by other observations (for example, Yan et al., 2010; Ern et al., 2011)

Yan, X., Arnold, N., and Remedios, J.: Global observations of gravity waves from High Resolution Dynamics Limb Sounder temperature measurements: A yearlong record of temperature amplitude and vertical wavelength, J. Geophys. Res., 115, D10113, doi:10.1029/2008JD011511, 2010.

Ern, M., Preusse, P., Gille, J. C., Hepplewhite, C. L., Mlynczak, M. G., Russell III, J. M., and Riese, M.: Implications for atmospheric dynamics derived from global observations of gravity wave momentum flux in stratosphere and mesosphere, J. Geophys. Res., 116, D19107, doi:10.1029/2011JD015821, 2011.


(2) p.13, l.6 / specific comment 7 in my previous review:
Previous observational evidence for meridional propagation of gravity waves should be mentioned

Much of the discussion in Sect.2.2 about the expected meridional propagation of gravity waves relies on model predictions (Watanabe, et al. 2008 and Sato et al., 2009, 2012) and AIRS observations at only a single altitude (Alexander and Teitelbaum, 2011).
There are however observational studies that cover larger altitude ranges and that have attributed slanted vertical columns of enhanced gravity wave variances (Jiang et al., 2004) or momentum fluxes (Ern et al., 2013) to meridional propagation of gravity waves, similar as in your study, but for gravity waves generated by convection.
Because these approaches are very similar, they should also be mentioned here.

Jiang, J. H., Wang, B., Goya, K., Hocke, K., Eckermann, S. D., J. Ma, J., Wu, D. L., and Read, W. J.: Geographical distribution and interseasonal variability of tropical deep convection: UARS MLS observations and analyses, J. Geophys. Res., 109, D03111, doi:10.1029/2003JD003756, 2004.

Ern, M., Preusse, P., Kalisch, S., Kaufmann, M., and Riese, M.: Role of gravity waves in the forcing of quasi two-day waves in the mesosphere: An observational study, J. Geophys. Res. Atmos., 118, 3467—3485, doi:10.1029/2012JD018208, 2013.





Technical comments:


p.3, ll.7/8: that that -> that

p.8, l.4: overbar is not centered above "T"

p.10, l.13: mountains waves -> mountain waves

p.17, l.8: is the usual sense -> in the usual sense

p.17, l.22: profile -> profiles

p.17, l.22: the absolute spectral peak -> the absolute spectral peak attains

p.18, l.4: indentifiable -> identifiable

p.31, l.9: (2) a possible contribution -> (2) a possible contribution of