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Aerosol effect on droplet spectral dispersion in warm continental cumuli

Pandithurai, G and Dipu, S and Prabha, TV and Maheskumar, RS and Kulkarni, JR and Goswami, BN (2012) Aerosol effect on droplet spectral dispersion in warm continental cumuli. Journal of Geophysical Research D: Atmospheres, 117 (16).

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In situ aircraft measurements of cloud microphysical properties and aerosol during the 1st phase of the Cloud Aerosol Interaction and Precipitation Enhancement EXperiment (CAIPEEX-I) over the Indian sub-continent provided initial opportunities to investigate the dispersion effect and its implications for estimating aerosol indirect effects in continental cumuli. In contrast to earlier studies on continental shallow cumuli, it is found that not only the cloud droplet number concentration but also the relative dispersion increases with the aerosol number concentration in continental cumuli. The first aerosol indirect effect estimated from the relative changes in droplet concentration and effective radius with aerosol number concentration are 0.13 and 0.07, respectively. In-depth analysis reveals that the dispersion effect could offset the cooling by enhanced droplet concentration by 39 in these continental cumuli. Adiabaticity analysis revealed aerosol indirect effect is lesser in subadiabatic clouds possibly due to inhomogeneous mixing processes. This study shows that adequate representation of the dispersion effect would help in accurately estimating the cloud albedo effect for continental cumuli and can reduce uncertainty in aerosol indirect effect estimates.

Item Type: Article
Additional Information: Copyright of this article belongs to American Geophysical Union.
Uncontrolled Keywords: Adiabaticity; Aerosol effect; Aerosol indirect effect; Aircraft measurement; Cloud albedo; Cloud droplet number; Cloud microphysical properties; Dispersion effect; Droplet concentration; Effective radius; In-depth analysis; In-situ; Mixing process; Number concentration; Precipitation enhancement; Relative dispersion; Spectral dispersions, Atmospheric aerosols; Clouds; Dispersions; Drops; Estimation; Precipitation (meteorology); Uncertainty analysis, Atmospheric movements, adiabatic process; aerosol; aircraft; albedo; concentration (composition); continental shelf; cooling; dispersion; estimation method; measurement method; spectral analysis; uncertainty analysis, India
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 04 Jan 2014 19:54
Last Modified: 04 Jan 2014 19:54

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