Constraining the Twomey effect from satellite observations: issues and perspectives

Quaas, Johannes; Arola, Antti; Cairns, Brian; Christensen, Matthew; Deneke, Hartwig; Ekman, Annica M. L.; Feingold, Graham; Fridlind, Ann; Gryspeerdt, Edward; Hasekamp, Otto; Li, Zhanqing; Lipponen, Antti; Ma, Po-Lun; Mülmenstädt, Johannes; Nenes, Athanasios; Penner, Joyce E.; Rosenfeld, Daniel; Schrödner, Roland; Sinclair, Kenneth; Sourdeval, Odran; Stier, Philip; Tesche, Matthias; van Diedenhoven, Bastiaan; Wendisch, Manfred

doi:https://doi.org/10.5194/acp-20-15079-2020

Articles | Volume 20, issue 23

https://doi.org/10.5194/acp-20-15079-2020

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

https://doi.org/10.5194/acp-20-15079-2020

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

Articles | Volume 20, issue 23

Review article

|

04 Dec 2020

Review article |

| 04 Dec 2020

Constraining the Twomey effect from satellite observations: issues and perspectives

Johannes Quaas, Antti Arola, Brian Cairns, Matthew Christensen, Hartwig Deneke, Annica M. L. Ekman, Graham Feingold, Ann Fridlind, Edward Gryspeerdt, Otto Hasekamp, Zhanqing Li, Antti Lipponen, Po-Lun Ma, Johannes Mülmenstädt, Athanasios Nenes, Joyce E. Penner, Daniel Rosenfeld, Roland Schrödner, Kenneth Sinclair, Odran Sourdeval, Philip Stier, Matthias Tesche, Bastiaan van Diedenhoven, and Manfred Wendisch

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Final revised paper (published on 04 Dec 2020)
Preprint (discussion started on 15 May 2020)

Interactive discussion

Status: closed

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

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RC1: 'A good overview of the observational challenges in quantifying the Twomey effect', Anonymous Referee #3, 12 Jun 2020
- AC1: 'Reply to reviewer #1', Johannes Quaas, 24 Sep 2020
SC1: 'Use of CALIPSO for aerosol indirect effect studies', David Painemal, 08 Jul 2020
- AC2: 'Reply to Dr. Painemal', Johannes Quaas, 24 Sep 2020
RC2: 'Review of "Constraining the Twomey effect from satellite observations: Issues and perspectives" by J. Quaas et al.', Anonymous Referee #1, 13 Aug 2020
- AC3: 'Reply to reviewer #3', Johannes Quaas, 24 Sep 2020

Peer-review completion

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

AR by Johannes Quaas on behalf of the Authors (24 Sep 2020) Author's response Manuscript

ED: Publish as is (08 Oct 2020) by Frank Dentener

AR by Johannes Quaas on behalf of the Authors (09 Oct 2020) Author's response Manuscript

Short summary

Anthropogenic pollution particles – aerosols – serve as cloud condensation nuclei and thus increase cloud droplet concentration and the clouds' reflection of sunlight (a cooling effect on climate). This Twomey effect is poorly constrained by models and requires satellite data for better quantification. The review summarizes the challenges in properly doing so and outlines avenues for progress towards a better use of aerosol retrievals and better retrievals of droplet concentrations.