Dear Authors,

I have now two reviews for your MS. Both reviewers valued the significance of the study but they also raised serious concerns about your paper in terms of presentations, methodology and data interpretations. And thus your paper cannot be considered for publication at BG before these issues are addressed.

Please consider to revise your MS by considering the comments and suggestions from the reviewers. If you decide to submit your revised MS, you need to provide a point-to-point response to the reviews.

Finally, thank you for considering BG.

Sincerely,

Minhan Dai

Dear Authrors,

Your revised has been further reviewed and both reviewers are overall happy with the revisions. However, as pointed out by Reviewer #2, the dicussion part of your paper must be improved before I can accept it for publication at BG.

I strongly encourage you to spend efforts to improve the dsicussion and send in your futher revised MS within 4 weeks.

Finally I thank you for your contribution to BG,

Sincerely,

Minhan Dai
Editor