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The nonlinear relationship between albedo and cloud fraction on near‐global, monthly mean scale in observations and in the CMIP5 model ensemble

Engström, A. ; Bender, F. A. ‐M. ; Charlson, R. J. ; Wood, R.

Geophysical Research Letters, 16 November 2015, Vol.42(21), pp.9571-9578 [Tạp chí có phản biện]

ISSN: 0094-8276 ; E-ISSN: 1944-8007 ; DOI: 10.1002/2015GL066275

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  • Nhan đề:
    The nonlinear relationship between albedo and cloud fraction on near‐global, monthly mean scale in observations and in the CMIP5 model ensemble
  • Tác giả: Engström, A. ; Bender, F. A. ‐M. ; Charlson, R. J. ; Wood, R.
  • Chủ đề: Albedo ; Cloud Fraction ; Cmip5
  • Là 1 phần của: Geophysical Research Letters, 16 November 2015, Vol.42(21), pp.9571-9578
  • Mô tả: We study the relation between monthly mean albedo and cloud fraction over ocean, 60°S–60°N. Satellite observations indicate that these clouds all fall on the same near‐exponential curve, with a monotonic distribution over the ranges of cloud fractions and albedo. Using these observational data as a reference, we examine the degree to which 26 climate models capture this feature of the near‐global marine cloud population. Models show a general increase in albedo with increasing cloud fraction, but none of them display a relation that is as well defined as that characterizing the observations. Models typically display larger albedo variability at a given cloud fraction, larger sensitivity in albedo to changes in cloud fraction, and lower cloud fractions. Several models also show branched distributions, contrasting with the smooth observational relation. In the models the present‐day cloud scenes are more reflective than the preindustrial, demonstrating the simulated impact of anthropogenic aerosols on planetary albedo. Albedo and cloud fraction are extremely well correlated over global ocean Models show too large spread in albedo for a given cloud fraction Present‐day aerosols explain higher albedos for a given cloud fraction
  • Số nhận dạng: ISSN: 0094-8276 ; E-ISSN: 1944-8007 ; DOI: 10.1002/2015GL066275

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