Influence of ENSO and MJO on the zonal structure of tropical tropopause inversion layer using high-resolution temperature profiles retrieved from COSMIC GPS Radio Occultation

Noersomadi,; Tsuda, Toshitaka; Fujiwara, Masatomo

doi:https://doi.org/10.5194/acp-19-6985-2019

Articles | Volume 19, issue 10

https://doi.org/10.5194/acp-19-6985-2019

© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/acp-19-6985-2019

© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 19, issue 10

Research article

|

24 May 2019

Research article |

| 24 May 2019

Influence of ENSO and MJO on the zonal structure of tropical tropopause inversion layer using high-resolution temperature profiles retrieved from COSMIC GPS Radio Occultation

Noersomadi, Toshitaka Tsuda, and Masatomo Fujiwara

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Final revised paper (published on 24 May 2019)
Preprint (discussion started on 17 Dec 2018)

Interactive discussion

Status: closed

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

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- Supplement

RC1: 'Review of 'Characteristics of the tropical tropopause inversion layer using high-resolution temperature profiles retrieved from COSMIC GNSS Radio Occultation' by Noersomadi et al.', Anonymous Referee #1, 14 Jan 2019
- AC1: 'Reply to RC1', Noersomadi Noersomadi, 25 Mar 2019
RC2: 'Comments-to-acp-2018-1182', Anonymous Referee #2, 18 Jan 2019
- AC2: 'Reply to RC2', Noersomadi Noersomadi, 25 Mar 2019
- AC1: 'Reply to RC1', Noersomadi Noersomadi, 25 Mar 2019
RC3: 'Review of 'Characteristics of the tropical tropopause inversion layer using high-resolution temperature profiles retrieved from COSMIC GNSS Radio Occultation'', Anonymous Referee #3, 10 Feb 2019
- AC3: 'Reply to RC3', Noersomadi Noersomadi, 25 Mar 2019
- AC1: 'Reply to RC1', Noersomadi Noersomadi, 25 Mar 2019

Peer-review completion

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

AR by Noersomadi Noersomadi on behalf of the Authors (25 Mar 2019) Manuscript

ED: Referee Nomination & Report Request started (28 Mar 2019) by Peter Haynes

RR by Anonymous Referee #1 (09 Apr 2019)

Suggestions for revision or reasons for rejection

Review of "Influence of ENSO and MJO on the zonal structure of tropical tropopause inversion layer using high-resolution temperature profiles retrieved from COSMIC GPS Radio Occultation" by Noersomadi et al.

The manuscript has improved a lot upon review, the authors have satisfied all of my comments, it reads very well overall with the right amount of detail and discussion in each section. It's a high-quality study and I recommend to publish it after a few very minor technical corrections:

## p.8 l.34: 'convective activity resulted in decreased...' --> I suggest a more correct expression 'regions with more frequent convective activity show decreased...' because strictly speaking these are climatologies.

## p.9 l.25-29: During El Nino events convection moves away from the MC towards the PO region and the eastern Pacific, so it's to be expected that the correlations with the ENSO index will be opposite for MC and PO. The high magnitude of the correlations for PO could be due to the fact that, outside ENSO events, this is a region with very low convective activity, whereas MC is not devoid of convection even during ENSO events (and MJO can influence the MC region as well in its late phases), meaning more processes will affect OLR and Sab there.
--> I suggest to slightly rephrase this part of the paragraph to include the points from above.

## p.11 l.5-9: This mechanism can also explain the differences in climatology between MC and PO as well as interannual to intraseasonal variability, since ENSO and MJO modulate convective activity. You test this with Fig. 14.

## p.11 l.10-17: you can link your result from Fig. 14 to the modulation of convection by ENSO and MJO from previous sections. It's really worth highlighting that your Fig. 14 kind of summarizes the forcing of tropical TIL variability across time-scales.
--> Also, I noticed sometimes there's a space and/or capital letter missing when you refer to figures (Fig.X / fig.X --> Fig. X) please check throughout the manuscript for consistency

####
#### Concluding remarks:
- Refer to the corresponding figure number when you introduce your results.
- Highlight what's new. Generally in the first two paragraphs your results agree very well with previous studies (refer to them as well), while your dataset has improved vertical resolution compared to them (this should be highlighted); and the last two paragraphs show variability in TIL properties (ENSO and MJO) that have not been studied in this detail previously.

## Fig. 8: you may want to check the legend labelling (PO should be solid red)

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RR by Anonymous Referee #2 (15 Apr 2019)

ED: Publish subject to technical corrections (17 Apr 2019) by Peter Haynes

AR by Noersomadi Noersomadi on behalf of the Authors (25 Apr 2019) Author's response Manuscript

Post-review adjustments

AA: Author's adjustment | EA: Editor approval

AA by Noersomadi Noersomadi on behalf of the Authors (17 May 2019) Author's adjustment Manuscript

EA: Adjustments approved (22 May 2019) by Peter Haynes

Short summary

Characteristics of static stability (N²) in the tropical tropopause are analyzed using 0.1 km vertical resolution temperature profiles retrieved from COSMIC GNSS-RO. We define the tropopause inversion layer (TIL) by the sharp increase in N² across the cold point tropopause (CPT) and the thickness of the enhanced peak in N² just above the CPT. We investigated the TIL at the intraseasonal to interannual timescales above the Maritime Continent and Pacific Ocean with different land–sea distribution.