Deep-convective influence on the upper troposphere–lower stratosphere composition in the Asian monsoon anticyclone region: 2017 StratoClim campaign results

Bucci, Silvia; Legras, Bernard; Sellitto, Pasquale; D'Amato, Francesco; Viciani, Silvia; Montori, Alessio; Chiarugi, Antonio; Ravegnani, Fabrizio; Ulanovsky, Alexey; Cairo, Francesco; Stroh, Fred

doi:https://doi.org/10.5194/acp-20-12193-2020

Articles | Volume 20, issue 20

https://doi.org/10.5194/acp-20-12193-2020

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

Special issue:

StratoClim stratospheric and upper tropospheric processes...

https://doi.org/10.5194/acp-20-12193-2020

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

Articles | Volume 20, issue 20

Research article

|

28 Oct 2020

Research article |

| 28 Oct 2020

Deep-convective influence on the upper troposphere–lower stratosphere composition in the Asian monsoon anticyclone region: 2017 StratoClim campaign results

Silvia Bucci, Bernard Legras, Pasquale Sellitto, Francesco D'Amato, Silvia Viciani, Alessio Montori, Antonio Chiarugi, Fabrizio Ravegnani, Alexey Ulanovsky, Francesco Cairo, and Fred Stroh

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

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RC1: 'Comment on the manuscript “Deep convective influence on the UTLS composition in the Asian Monsoon Anticyclone region: 2017 StratoClim campaign results” by Bucci et al.', Anonymous Referee #1, 05 Feb 2020
- AC1: 'Answer to reviewer 1', Silvia Bucci, 20 Jun 2020
RC2: 'Comment for the manuscript "Deep convective influence on the UTLS composition in the Asian Monsoon Anticyclone region: 2017 StratoClim campaign results" by Bucci et al', Anonymous Referee #2, 02 Mar 2020
- AC2: 'Answer to reviewer 2', Silvia Bucci, 20 Jun 2020

Peer-review completion

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

AR by Silvia Bucci on behalf of the Authors (22 Jun 2020) Author's response Manuscript

ED: Referee Nomination & Report Request started (14 Aug 2020) by Timothy J. Dunkerton

RR by Anonymous Referee #2 (14 Aug 2020)

RR by Anonymous Referee #1 (18 Aug 2020)

Suggestions for revision or reasons for rejection

Based on StratoClim campaign measurements combined with trajectory simulation and convective cloud top from satellite data, this manuscript investigated the deep convective influence on the UTLS composition, and found some interesting and important results, particularly for the Flight 8 case, which showed that the air sampled in close position to the convective system was fairly old, and that convective events penetrating the tropopause level at very small scale could be detected by CO measurement but couldn't be simulated by trajectory model. Overall, this manuscript is well written and is recommended to be published in ACP.
Minor issues:
1. INTRODUCTION. This paper entitled by "deep convective influence on the UTLS composition in the Asian Monsoon Anticyclone region...", introduced some results on "effective pathway for trapping tropospheric pollutants and water vapor" related to AMA, but almost nothing on deep convective transport. Some previous studies on deep convective transport in the Asian monsoon region should be introduced here, and a recent review paper by Bian et al. (2020) is recommended.
Bian, J., et al., 2020: Transport of Asian surface pollutants to the global stratosphere from the Tibetan Plateau region during the Asian summer monsoon, National Science Review, 7, 516-533, doi:10.1093/nsr/nwaa005.

2. P2L27: The ATAL is also confirmed by balloon-sounding measurements (COBALD and POPS). Two papers from in-situ measurements are recommended to be cited here.
Vernier et al., JGR, 2015.
Yu, P., K. H. Rosenlof, S. Liu, H. Telg, T. D. Thornberry, A. W. Rollins, R. W. Portmann, Z. Bai, E.A. Ray, Y. Duan, L. L. Pan, O. B. Toon, J. Bian, and R.-S. Gao, 2017: Efficient transport of tropospheric aerosol into the stratosphere via the Asian summer monsoon anticyclone, Proceedings of the National Academy of Sciences of the United States of America, 114, 6972–6977, www.pnas.org/cgi/doi/10.1073/pnas.1701170114.

3. P2L28-29: The radiative forcing is regional, which should be clearly stated.

4. Fig. 7&9: Artificial CO enhancement δCO proxy simulated from ERA-5 diabatic simulations is recommended to be used in the plot instead of CO COLD, because all the related analysis is based on the simulation, which has some detailed differences from the measurement.

5. P15L29-30: This saying is supported by the work from Fan et al. (2017).
Fan, Q., J. Bian, and L. L. Pan, 2017: Atmospheric boundary layer sources for upper tropospheric air over the Asian summer monsoon region, Atmospheric and Oceanic Science Letters, 10:5, 358-363, DOI: 10.1080/16742834.2017.1344089.

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ED: Publish as is (31 Aug 2020) by Timothy J. Dunkerton

AR by Silvia Bucci on behalf of the Authors (07 Sep 2020)

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Short summary

The paper presents and evaluates a transport analysis method to study the convective injection of air in the upper troposphere–lower stratosphere of the Asian monsoon anticyclone region. The approach is thereby used to analyse the trace gas data collected during the StratoClim aircraft campaign. The results showed that fresh convective air can be injected fast at a high level of the atmosphere (above 17 km), with potential impacts on the stratospheric chemistry of the Northern Hemisphere.