Constraining the instantaneous aerosol influence on cloud albedo

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

doi:10.1073/pnas.1617765114

Constraining the instantaneous aerosol influence on cloud albedo

Journal Article · Wed Apr 26 00:00:00 EDT 2017 · Proceedings of the National Academy of Sciences of the United States of America

DOI:https://doi.org/10.1073/pnas.1617765114· OSTI ID:1361962

^[1]; Quaas, Johannes ^[2]; Ferrachat, Sylvaine ^[3]; Gettelman, Andrew ^[4]; Ghan, Steven ^[5]; Lohmann, Ulrike ^[3]; Morrison, Hugh ^[4]; Neubauer, David ^[3]; Partridge, Daniel G. ^[6]; ^[7]; Takemura, Toshihiko ^[8]; Wang, Hailong ^[5]; Wang, Minghuai ^[9]; Zhang, Kai ^[5]

Univ. Leipzig, Leipzig (Germany); Imperial College London, London (United Kingdom)
Univ. Leipzig, Leipzig (Germany)
ETH Zurich, Zurich (Switzerland)
National Center for Atmospheric Research, Boulder, CO (United States)
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Stockholm Univ., Stockholm (Sweden); Univ. of Exeter, Exeter (United Kingdom)
Univ. of Oxford, Oxford (United Kingdom)
Kyushu Univ., Fukuoka (Japan)
Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Nanjing Univ., Nanjing (China); Collaborative Innovation Center of Climate Change, Nanjing (China)

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 (N_d), previous studies have used the sensitivity of the N_d 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 N_d to anthropogenic aerosol perturbations. Using an ensemble of global aerosol–climate models, this study demonstrates how joint histograms between N_d 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. Furthermore, 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.

View Accepted Manuscript (DOE)

Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 1361962

Report Number(s):: PNNL-SA--126491; KP1703040

Journal Information:: Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Issue: 19 Vol. 114; ISSN 0027-8424

Publisher:: National Academy of Sciences, Washington, DC (United States)Copyright Statement

Country of Publication:: United States

Language:: English

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