Dominant patterns of interaction between the tropics  and mid-latitudes in boreal summer: causal  relationships and the role of timescales

Di Capua, Giorgia; Runge, Jakob; Donner, Reik V.; van den Hurk, Bart; Turner, Andrew G.; Vellore, Ramesh; Krishnan, Raghavan; Coumou, Dim

doi:https://doi.org/10.5194/wcd-1-519-2020

Articles | Volume 1, issue 2

https://doi.org/10.5194/wcd-1-519-2020

© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/wcd-1-519-2020

© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 1, issue 2

Research article

|

15 Oct 2020

Research article |

| 15 Oct 2020

Dominant patterns of interaction between the tropics and mid-latitudes in boreal summer: causal relationships and the role of timescales

Giorgia Di Capua, Jakob Runge, Reik V. Donner, Bart van den Hurk, Andrew G. Turner, Ramesh Vellore, Raghavan Krishnan, and Dim Coumou

Download

Final revised paper (published on 15 Oct 2020)
Supplement to the final revised paper
Preprint (discussion started on 23 Apr 2020)
Supplement to the preprint

Interactive discussion

Status: closed

AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment

- Printer-friendly version

- Supplement

RC1: 'Review of wcd-2020-14', Anonymous Referee #1, 25 May 2020
- SC1: 'Sort comment (combined for both reviewer #1 and #2)', Giorgia Di Capua, 03 Jun 2020
- AC1: 'Final response to referee #1', Giorgia Di Capua, 13 Jul 2020
RC2: 'Dominant patterns of interaction between the tropics and midlatitudes in boreal summer: Causal relationship s and the role of timescales by Di Capua et al', Anonymous Referee #2, 26 May 2020
- SC2: 'Sort comment (combined for both reviewer #1 and #2)', Giorgia Di Capua, 03 Jun 2020
- AC2: 'Final response to referee #2', Giorgia Di Capua, 13 Jul 2020

Peer-review completion

AR: Author's response | RR: Referee report | ED: Editor decision

AR by Giorgia Di Capua on behalf of the Authors (20 Jul 2020) Author's response Manuscript

ED: Referee Nomination & Report Request started (03 Aug 2020) by Daniela Domeisen

RR by Anonymous Referee #1 (04 Aug 2020)

RR by Anonymous Referee #2 (25 Sep 2020)

For final publication, the manuscript should be

accepted as is

accepted subject to technical corrections

accepted subject to minor revisions

reconsidered after major revisions

I would be willing to review the revised paper, if the editor considers it necessary.

I am not willing to review the revised paper.

rejected

Suggestions for revision or reasons for rejection

The authors addressed all comments to a satisfactory degree and revised the manuscript substantially. I recommend the manuscript for publication after minor revision.
Minor Comments (Line numbers for the manuscript version with tracked changes)
1) L51, L279, L286: Change “the causal maps that plot” to “the causal maps show”
2) L57-58: “and therefore works towards improved sub-seasonal and climate projections”. I think the authors wanted to say “sub-seasonal predictions and climate projections” as predictions and projections are two different types of climate simulations: the former one is the initial-value or initial and boundary value problem whereas the latter is the boundary-value problem. On the other hand, the sentence could be finished before “and therefore”.
3) L247-248: “By repeating this step for each variable…“ But also repeating this step for all lat and lon, isn’t it? Or from which step the analysis should be repeated for each lon and lat, please specify this more clearly.
4) L262: Eta should be also explained for completeness of the description.
5) L310: Should be “Figure 2a-d show”
6) L536-541 is one sentence, which is too long and difficult to follow.
7) L546: “ ... dominate” what?
8) L604: Did authors wanted to say “it is still significant”?
9) L604: “stronger causal effect”: stronger than what?
10) L641: “CEN provide an encoded predictive model” Please be more specific, it reads a bit strange. One could say it provides a statistical model but it feels that the authors somehow avoid using this term.
11) L644: "path coefficient β ~ 0.4, thus indicating potential for predictability." Doesn’t it mean that in terms of the variance explained SAM explains about 16 % of the CGT variability? Thus, the statement is a bit too bold.
12) L645: Further or future studies instead of “Further work”
13) Figure2 caption: timescaletimescale typo

Hide

ED: Publish subject to technical corrections (25 Sep 2020) by Daniela Domeisen

AR by Giorgia Di Capua on behalf of the Authors (30 Sep 2020) Author's response Manuscript

Short summary

We study the interactions between the tropical convective activity and the mid-latitude circulation in the Northern Hemisphere during boreal summer. We identify two circumglobal wave patterns with phase shifts corresponding to the South Asian and the western North Pacific monsoon systems at an intra-seasonal timescale. These patterns show two-way interactions in a causal framework at a weekly timescale and assess how El Niño affects these interactions.