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

研究成果: Contribution to journalArticle

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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.

元の言語英語
ページ(範囲)4899-4904
ページ数6
ジャーナルProceedings of the National Academy of Sciences of the United States of America
114
発行部数19
DOI
出版物ステータス出版済み - 5 9 2017

All Science Journal Classification (ASJC) codes

  • General

フィンガープリント Constraining the instantaneous aerosol influence on cloud albedo' の研究トピックを掘り下げます。これらはともに一意のフィンガープリントを構成します。

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    Gryspeerdt, E., Quaas, J., Ferrachat, S., Gettelman, A., Ghan, S., Lohman, U., Morrison, H., Neubauer, D., Partridge, D. G., 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, 114(19), 4899-4904. https://doi.org/10.1073/pnas.1617765114