Constraining the instantaneous aerosol influence on cloud albedo

Edward Gryspeerdt, Johannes Quaas, Sylvaine Ferrachat, Andrew Gettelman, Steven Ghan, Ulrike Lohman, Hugh Morrison, David Neubauer, Daniel G. Partridge, Philip Stier, Toshihiko Takemura, Hailong Wang, Minghuai Wang, Kai Zhang

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Much of the uncertainty in estimates of the anthropogenic forcing of climate change comes from uncertainties in the instantaneous effect of aerosols on cloud albedo, known as the Twomey effect or the radiative forcing from aerosol-cloud interactions (RFaci), a component of the total or effective radiative forcing. Because aerosols serving as cloud condensation nuclei can have a strong influence on the cloud droplet number concentration (Nd), previous studies have used the sensitivity of the Nd to aerosol properties as a constraint on the strength of the RFaci. However, recent studies have suggested that relationships between aerosol and cloud properties in the present-day climate may not be suitable for determining the sensitivity of the Nd to anthropogenic aerosol perturbations. Using an ensemble of global aerosol-climate models, this study demonstrates how joint histograms between Nd and aerosol properties can account for many of the issues raised by previous studies. It shows that if the anthropogenic contribution to the aerosol is known, the RFaci can be diagnosed to within 20% of its actual value. The accuracy of different aerosol proxies for diagnosing the RFaci is investigated, confirming that using the aerosol optical depth significantly underestimates the strength of the aerosol-cloud interactions in satellite data.

Original languageEnglish
Pages (from-to)4899-4904
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume114
Issue number19
DOIs
Publication statusPublished - May 9 2017

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albedo
volcanic cloud
aerosol
radiative forcing
aerosol property
cloud condensation nucleus
cloud droplet
histogram
optical depth
satellite data
climate modeling
perturbation
climate change
climate

All Science Journal Classification (ASJC) codes

  • General

Cite this

Gryspeerdt, E., Quaas, J., Ferrachat, S., Gettelman, A., Ghan, S., Lohman, U., ... Zhang, K. (2017). Constraining the instantaneous aerosol influence on cloud albedo. Proceedings of the National Academy of Sciences of the United States of America, 114(19), 4899-4904. https://doi.org/10.1073/pnas.1617765114

Constraining the instantaneous aerosol influence on cloud albedo. / Gryspeerdt, Edward; Quaas, Johannes; Ferrachat, Sylvaine; Gettelman, Andrew; Ghan, Steven; Lohman, Ulrike; Morrison, Hugh; Neubauer, David; Partridge, Daniel G.; Stier, Philip; Takemura, Toshihiko; Wang, Hailong; Wang, Minghuai; Zhang, Kai.

In: Proceedings of the National Academy of Sciences of the United States of America, Vol. 114, No. 19, 09.05.2017, p. 4899-4904.

Research output: Contribution to journalArticle

Gryspeerdt, E, Quaas, J, Ferrachat, S, Gettelman, A, Ghan, S, Lohman, U, Morrison, H, Neubauer, D, Partridge, DG, Stier, P, Takemura, T, Wang, H, Wang, M & Zhang, K 2017, 'Constraining the instantaneous aerosol influence on cloud albedo', Proceedings of the National Academy of Sciences of the United States of America, vol. 114, no. 19, pp. 4899-4904. https://doi.org/10.1073/pnas.1617765114
Gryspeerdt, Edward ; Quaas, Johannes ; Ferrachat, Sylvaine ; Gettelman, Andrew ; Ghan, Steven ; Lohman, Ulrike ; Morrison, Hugh ; Neubauer, David ; Partridge, Daniel G. ; Stier, Philip ; Takemura, Toshihiko ; Wang, Hailong ; Wang, Minghuai ; Zhang, Kai. / Constraining the instantaneous aerosol influence on cloud albedo. In: Proceedings of the National Academy of Sciences of the United States of America. 2017 ; Vol. 114, No. 19. pp. 4899-4904.
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