Impact of low-pressure systems on winter heavy air pollution in the northwest Sichuan Basin, China

Ning, Guicai; Wang, Shigong; Yim, Steve Hung Lam; Li, Jixiang; Hu, Yuling; Shang, Ziwei; Wang, Jinyan; Wang, Jiaxin

doi:https://doi.org/10.5194/acp-18-13601-2018

Articles | Volume 18, issue 18

https://doi.org/10.5194/acp-18-13601-2018

© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Special issue:

Regional transport and transformation of air pollution in...

https://doi.org/10.5194/acp-18-13601-2018

© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 18, issue 18

Research article

|

25 Sep 2018

Research article |

| 25 Sep 2018

Impact of low-pressure systems on winter heavy air pollution in the northwest Sichuan Basin, China

Guicai Ning, Shigong Wang, Steve Hung Lam Yim, Jixiang Li, Yuling Hu, Ziwei Shang, Jinyan Wang, and Jiaxin Wang

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Final revised paper (published on 25 Sep 2018)
Supplement to the final revised paper
Preprint (discussion started on 26 Feb 2018)

Interactive discussion

Status: closed

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

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RC1: 'reviewer comment on acp-2018-61', Anonymous Referee #1, 19 Mar 2018
- AC1: 'Response to Anonymous Referee #1', Shigong Wang, 05 Jul 2018
RC2: 'Impact of low-pressure systems on winter heavy air pollution in the northwest Sichuan Basin, China', Anonymous Referee #2, 03 Jun 2018
- AC2: 'Response to Anonymous Referee #2', Shigong Wang, 05 Jul 2018

Peer-review completion

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

AR by Shigong Wang on behalf of the Authors (05 Jul 2018)

ED: Referee Nomination & Report Request started (30 Jul 2018) by Tong Zhu

RR by Anonymous Referee #1 (31 Jul 2018)

Suggestions for revision or reasons for rejection

The revised paper addressed the major points in my previous comments. I recommend accept for the publication in ACP after further minor revisions as outlined below.

Line 145, “with small change magnitude” rewritten as “less changed”
Line 146-147, “the meteorological conditions … considered” changed to “the meteorological conditions contributing to the atmospheric ventilation should be taken into consideration”
Line 151, delete “However”
Line 152-154, “To quantitatively … coefficient” repeat above sentence, please delete it.
Line 188, “the amomalies…”, better written as “composite anomalies…”. To my understanding, composite anomalies were the departure of the mean wind vectors and GH at 700 hPa averaged over the eight deteriorating air quality events from their respective means from Jan 1 2006 to Dec 31 2012 and from Jan 1 2014 to Feb 28 2017
Line 188, delete “over there”
Line 253, delete “Soon”, rewrite sentence as “As shown in Fig. 4b, a low trough was subsequently generated…”
Line 300, “composite anomalies”
Line 305, temperature change or temperature? Below you said “temperature”
Line 313-314, “that the” changed to “characterized by the weak effects…”, delete “were weak”
Line 316, “with small change magnitude” change to “less altered”
Line 318, delete “magnitudes of”
Line 318-319, “the change of magnitudes of temperature” changed to “the degree of change in temperature”
Line 341, delete “in”
Line 345-368, this part is beyond scope of this paper because you were discussing “low pressure system”. You might briefly mention the firework and CNY influence but not such the details.

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ED: Publish subject to minor revisions (review by editor) (20 Aug 2018) by Tong Zhu

AR by Shigong Wang on behalf of the Authors (20 Aug 2018) Author's response Manuscript

ED: Publish as is (03 Sep 2018) by Tong Zhu

AR by Shigong Wang on behalf of the Authors (04 Sep 2018) Manuscript

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Short summary

Under the effects of the Tibetan Plateau, dry low-pressure systems are often formed at 700 hPa in the Sichuan Basin, China, during winter. Here, we found that the activities of these dry low-pressure systems have significant influence on most winter heavy air pollution events in the Sichuan Basin. Influencing mechanisms have been summarized. The strong inversion layer above the atmospheric boundary layer induced by the low-pressure system plays a key role in the formation of heavy air pollution.