globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1922502117
论文题名:
The hemispheric contrast in cloud microphysical properties constrains aerosol forcing
作者: McCoy I.L.; McCoy D.T.; Wood R.; Regayre L.; Watson-Parris D.; Grosvenor D.P.; Mulcahy J.P.; Hu Y.; Bender F.A.M.; Field P.R.; Carslaw K.S.; Gordon H.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2020
卷: 117, 期:32
起始页码: 18998
结束页码: 19006
语种: 英语
Scopus关键词: aerosol ; Antarctica ; article ; climate change ; concentration (parameter) ; global climate ; greenhouse gas ; Northern Hemisphere ; precipitation ; radiative forcing ; sea ; Southern Hemisphere ; Southern Ocean ; summer ; uncertainty ; concentration (parameter) ; radiative forcing ; remote sensing ; Southern Ocean
英文摘要: The change in planetary albedo due to aerosol-cloud interactions during the industrial era is the leading source of uncertainty in inferring Earth s climate sensitivity to increased greenhouse gases from the historical record. The variable that controls aerosol-cloud interactions in warm clouds is droplet number concentration. Global climate models demonstrate that the present-day hemispheric contrast in cloud droplet number concentration between the pristine Southern Hemisphere and the polluted Northern Hemisphere oceans can be used as a proxy for anthropogenically driven change in cloud droplet number concentration. Remotely sensed estimates constrain this change in droplet number concentration to be between 8 cm-3 and 24 cm-3. By extension, the radiative forcing since 1850 from aerosol-cloud interactions is constrained to be -1.2 W m-2 to -0.6 W m-2. The robustness of this constraint depends upon the assumption that pristine Southern Ocean droplet number concentration is a suitable proxy for preindustrial concentrations. Droplet number concentrations calculated from satellite data over the Southern Ocean are high in austral summer. Near Antarctica, they reach values typical of Northern Hemisphere polluted outflows. These concentrations are found to agree with several in situ datasets. In contrast, climate models show systematic underpredictions of cloud droplet number concentration across the Southern Ocean. Near Antarctica, where precipitation sinks of aerosol are small, the underestimation by climate models is particularly large. This motivates the need for detailed process studies of aerosol production and aerosol-cloud interactions in pristine environments. The hemispheric difference in satellite estimated cloud droplet number concentration implies preindustrial aerosol concentrations were higher than estimated by most models. © 2020 National Academy of Sciences. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164087
Appears in Collections:气候变化与战略

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作者单位: McCoy, I.L., Atmospheric Sciences Department, University of Washington, Seattle, WA 98105, United States; McCoy, D.T., Institute for Climate and Atmospheric Science, School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, United Kingdom; Wood, R., Atmospheric Sciences Department, University of Washington, Seattle, WA 98105, United States; Regayre, L., Institute for Climate and Atmospheric Science, School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, United Kingdom; Watson-Parris, D., Department of Physics, University of Oxford, Oxford, OX1 3PU, United Kingdom; Grosvenor, D.P., Institute for Climate and Atmospheric Science, School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, United Kingdom, National Center for Atmospheric Science, University of Leeds, Leeds, LS2 9JT, United Kingdom; Mulcahy, J.P., Met Office, Exeter, EX1 3PB, United Kingdom; Hu, Y., Atmospheric Composition Branch, NASA Langley Research Center, Hampton, VA 23681, United States; Bender, F.A.M., Department of Meteorology, Stockholm University, Stockholm, SE-106 91, Sweden, Bolin Centre for Climate Research, Stockholm University, Stockholm, SE-106 91, Sweden; Field, P.R., Institute for Climate and Atmospheric Science, School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, United Kingdom, Met Office, Exeter, EX1 3PB, United Kingdom; Carslaw, K.S., Institute for Climate and Atmospheric Science, School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, United Kingdom; Gordon, H., Institute for Climate and Atmospheric Science, School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, United Kingdom, College of Engineering, Carnegie-Mellon University, Pittsburgh, PA 15213, United States

Recommended Citation:
McCoy I.L.,McCoy D.T.,Wood R.,et al. The hemispheric contrast in cloud microphysical properties constrains aerosol forcing[J]. Proceedings of the National Academy of Sciences of the United States of America,2020-01-01,117(32)
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