Aerosols, Cloud Microphysics, and Fractional Cloudiness

@article{Albrecht1989AerosolsCM,
  title={Aerosols, Cloud Microphysics, and Fractional Cloudiness},
  author={Bruce A. Albrecht},
  journal={Science},
  year={1989},
  volume={245},
  pages={1227 - 1230}
}
  • B. Albrecht
  • Published 1989
  • Environmental Science, Medicine
  • Science
Increases in aerosol concentrations over the oceans may increase the amount of low-level cloudiness through a reduction in drizzle—a process that regulates the liquid-water content and the energetics of shallow marine clouds. The resulting increase in the global albedo would be in addition to the increase due to enhancement in reflectivity associated with a decrease in droplet size and would contribute to a cooling of the earth's surface. 
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References

SHOWING 1-10 OF 29 REFERENCES
Oceanic phytoplankton, atmospheric sulphur, cloud albedo and climate
The major source of cloud-condensation nuclei (CCN) over the oceans appears to be dimethylsulphide, which is produced by planktonic algae in sea water and oxidizes in the atmosphere to form aExpand
An assessment of the impact of pollution on global cloud albedo
Increased pollution leads to increasing particulate concentrations. Since some particles nucleatedrop formation, clouds will contain, with increasing pollution, more drops per unit volume, andhenceExpand
The role of cloud microphysical processes in climate: an assessment from a one-dimensional perspective
The potential link between cloud microphysical processes and climate is investigated and theorized. We base our theory on results simulated from a one-dimensional climate model with an interactiveExpand
Effect of Ship-Stack Effluents on Cloud Reflectivity
TLDR
The effect of aerosols on cloud reflectivity is expected to have a larger influence on the earth's albedo than that due to the direct scattering and absorption of sunlight by the aerosols alone. Expand
Parameterization of Trade-Cumulus Cloud Amounts
Abstract A scheme for parameterizing the fractional cloud coverage of trade cumuli is developed which gives the cloud cover in terms of the cloud-layer relative humidity and the liquid water contentExpand
A STUDY OF CONVECTIVE PRECIPITATION BASED ON CLOUD AND RADAR OBSERVATIONS
Abstract Observations of precipitation and cloud-top height in the central United States and in the Caribbean area, obtained from radar-equipped airplanes, have been analyzed in terms of the fractionExpand
Models of cloud-topped mixed layers under a strong inversion
Theoretical models are constructed with the aim of relating, explaining and predicting features of a radiatively active turbulent cloud layer over the sea and under a strong subsidence inversion.Expand
Turbulent Mixing, Spectral Evolution and Dynamics in a Warm Cumulus Cloud
Abstract The analysis of Paluch suggests that some cumuli contain cloudy air from only two sources: cloud base and cloud top. A framework is presented for the investigation of droplet spectralExpand
Marine Stratocumulus Layers. Part II: Turbulence Budgets
Abstract This paper discusses the turbulence profiles and budgets for two days of radiation, dynamical and thermodynamical observations by the NCAR Electra in shallow marine stratocumulus off theExpand
The dynamics of stratocumulus: Aircraft observations and comparisons with a mixed layer model
Results are presented from a detailed case study of daytime stratocumulus over the North Sea using an instrumented aircraft. The measurements include turbulence fluctuation data, radiation fluxes andExpand
...
1
2
3
...