Stratospheric ozone intrusion events and their impacts on tropospheric ozone in the Southern Hemisphere

Greenslade, Jesse W.; Alexander, Simon P.; Schofield, Robyn; Fisher, Jenny A.; Klekociuk, Andrew K.

doi:https://doi.org/10.5194/acp-17-10269-2017

Articles | Volume 17, issue 17

https://doi.org/10.5194/acp-17-10269-2017

© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

https://doi.org/10.5194/acp-17-10269-2017

© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Articles | Volume 17, issue 17

Research article

|

01 Sep 2017

Research article |

| 01 Sep 2017

Stratospheric ozone intrusion events and their impacts on tropospheric ozone in the Southern Hemisphere

Jesse W. Greenslade, Simon P. Alexander, Robyn Schofield, Jenny A. Fisher, and Andrew K. Klekociuk

Download

Final revised paper (published on 01 Sep 2017)
Supplement to the final revised paper
Preprint (discussion started on 05 Jan 2017)

Interactive discussion

Status: closed

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

- Printer-friendly version

- Supplement

SC1: 'Short comments', Meiyun Lin, 19 Jan 2017
- SC2: 'Thanks', Jesse Greenslade, 25 Jan 2017
RC1: 'Review of the manuscript by Greenslade et al.', Anonymous Referee #1, 06 Feb 2017
RC2: 'Review', Anonymous Referee #2, 06 Feb 2017
RC3: 'Review of Greenslade et al.,', Anonymous Referee #3, 23 Feb 2017
AC1: 'Final Response from Authors', Jesse Greenslade, 26 May 2017
- AC2: 'Final response - complete version', Jesse Greenslade, 07 Jun 2017

Peer-review completion

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

AR by Jesse Greenslade on behalf of the Authors (26 May 2017) Author's response Manuscript

ED: Referee Nomination & Report Request started (14 Jun 2017) by Andrea Pozzer

RR by Anonymous Referee #1 (03 Jul 2017)

Suggestions for revision or reasons for rejection

In authors’ responses to my first review many of my comments have been addressed. I believe that the revised manuscript is improved both in terms of scientific approach and structure. Nevertheless, I still see place for comments. Moreover, I don’t see any improvement with the language usage in the revised version. I would recommend publication of the manuscript after the authors improve the readability of the manuscript and address the following minor comments.

- Page 1, line 8: above all three sites -> for all three sites
- Page 1, line 9: from STT events -> owing to STT events
- Page 1, line 9: and Macquarie Island -> and Macquarie Island, respectively
- Page 2, line 9: show stratospheric ozone -> show that stratospheric ozone
- Page 2, line 21: Another important region of STT -> Another hotspot of STT
- Page 2, lines 21-22: with 10 ppbv from STT contribution -> with a stratospheric contribution of 10 ppb
- Page 2, lines 32-33: “Lower stratospheric ... over the ocean”. Which ocean? Please rephrase.
- Page 3, lines 5-7: Replace sentence with: “The summertime pool of high tropospheric ozone over the eastern Mediterranean (EM) is mainly attributed to the downward ozone transport, as a result of the enhanced subsidence (Zanis et al., 2014) and the tropopause fold activity (Akritidis et al., 2016) over the region.”
- Page 3, line 7: frequently shows -> exhibits
- Page 3, line 7: stratospheric subsidence -> subsidence
- Page 3, line 13: “shear upper tropospheric winds” -> “upper tropospheric wind shear” ?
- The “southern hemisphere” phrase is first seen at page 2, line 9. You should add the SH abbreviation there instead of the current position in the manuscript.
- Page 3: “Section 2 describes”, “Section 3 describes”, “Section 4 analyses”: I suggest rephrasing these with “In Section 2 we describe..” or something similar.
- Figure 1 caption: I suggest removing “which will be”.
- Page 4, line 3: to 35 -> and up to 35
- Page 4, line 4: make -> perform
- Page 5, line 16: high tropopause values -> high tropopause height values
- Page 5, line 17: lapse rate tropopauses -> lapse rate defined tropopause
- PVU is the unit and potential vorticity (PV) the variable. Please replace at page 5 lines 18-20 “Another commonly used…Tyrlis et al., 2014).” with the following: “Another commonly used tropopause definition is determined with the use of PV (dynamical tropopause). In the extra-tropics the isosurface where PV=2 PVU (1 PVU= 10-6 m2 s-1 K kg-1) is often used to define the tropopause, allowing the 3D representation of tropopause folds and other tropopause features in a sufficiently resolved model (Škerlak et al., 2014; Tyrlis et al., 2014)”.
- Page 5, line 20: The PVU-> PV
- Page 11, line 18: ozone fold -> tropopause fold
- Page 11, lines 19-20: “Their work seems.. ozonesonde measurements.” I don’t find any remarkable agreement between your findings and the findings by Skerlak et al. (2015) over Melbourne. In Skerlak et al. (2015) the fold frequency over Melbourne during DJF is 1-2% and during JJA is 0.5-1%, which in no case agrees with your findings (much higher STT frequency during DJF compared to JJA).
- Page 14, Figure 7 caption: STT event altitude -> STT events altitude
- Page 15, Figure 8 caption: STT event depth -> STT events depth
- Page 15, Section 4 title: I suggest using “Simulated ozone columns” instead of “Simulation of ozone columns”.
- Page 16, line 14: and saw -> and found
- Page 16, lines 14-15: when running with -> when using the
- Page 19, lines 22-23: “(fluxi.. “. Close parenthesis.
- Page 20, line 31: use a model with stratospheric ozone tracer -> used a model carrying a tracer for stratospheric ozone
- Page 21, Figure 12: Multiply with 100 the y axis values on the bottom figure in order to be the % fraction.
- Page 27, means they are capable -> suggests they are capable
- Page 27, line 3: tropsopheric -> tropospheric
- Supplement, Figure S1 caption: Melbourne ozone -> ozone over Melbourne

Hide

RR by Anonymous Referee #3 (09 Jul 2017)

ED: Publish subject to technical corrections (27 Jul 2017) by Andrea Pozzer

AR by Jesse Greenslade on behalf of the Authors (01 Aug 2017) Author's response Manuscript

Download

Article (2314 KB)
Full-text XML

Short summary

An analysis of data from ozonesondes released at three southern oceanic sites shows the impact of stratospheric ozone in this region. Using a novel method of transport classification, this work estimates the seasonality and quantity of stratospherically sourced ozone. We find that ozone is transported most frequently in summer due to regional-scale low-pressure weather systems. We also estimate a stratospheric ozone source of 2.0–3.3 Tg/year over three Southern Ocean regions.