|Second review of “Surface Impacts of the Quasi Biennial Oscillation”|
By Lesley J. Gray, James A. Anstey, Yoshio Kawatani, Hua Lu, Scott Osprey, and Verena Schenzinger
The authors have satisfactorily addressed my comments on the original submission. Their final paragraph in the conclusions is quite reasonable, and while I hope the authors consider pursuing some of the analysis I suggested in my original comments for future work, the paper in its current form stands alone as a significant contribution. This paper should be accepted after the authors clarify some final, very minor points:
Page 2, line 11 There are earlier papers than that of Hansen that address nonlinearities between the effect of the QBO and that of ENSO, such as Garfinkel and Hartmann 2007, Wei et al 2007, and Calvo et al 2009 (the first two using reanalysis and the latter using models).
Page 6 line 4: what precise formula is used to account for the reduction in degrees of freedom due to autocorrelation of the indices? (There are a few different I’m aware of, and for reproducibility the authors should state which they use.)
Page 14 line 16: I think the authors intend to cite Garfinkel and Hartmann 2011 here, not Garfinkel et al 2012
Garfinkel, C. I., and D. L. Hartmann. "Effects of the El Niño–Southern Oscillation and the quasi‐biennial oscillation on polar temperatures in the stratosphere." Journal of Geophysical Research: Atmospheres 112, no. D19 (2007).
Wei, Ke, Wen Chen, and Ronghui Huang. "Association of tropical Pacific sea surface temperatures with the stratospheric Holton‐Tan Oscillation in the Northern Hemisphere winter." Geophysical Research Letters 34, no. 16 (2007).
Calvo, Natalia, Marco A. Giorgetta, Ricardo Garcia‐Herrera, and Elisa Manzini. "Nonlinearity of the combined warm ENSO and QBO effects on the Northern Hemisphere polar vortex in MAECHAM5 simulations." Journal of Geophysical Research: Atmospheres 114, no. D13 (2009).