Publication:
Precipitation effects of giant cloud condensation nuclei artificially introduced into stratocumulus clouds

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Authors
Jung, E.
Albrecht, B.A.
Jonsson, H.H.
Chen, Y.-C.
Seinfeld, J.H.
Sorooshian, A.
Metcalf, A.R.
Song, S.
Fang, M.
Russell, L.M.
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Advisors
Date of Issue
2015
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Abstract
To study the effect of giant cloud condensation nuclei (GCCN) on precipitation processes in stratocumulus clouds, 1–10 μm diameter salt particles (salt powder) were released from an aircraft while flying near the cloud top on 3 August 2011 off the central coast of California. The seeded area was subsequently sampled from the aircraft that was equipped with aerosol, cloud, and precipitation probes and an upward-facing cloud radar. During post-seeding sampling, made 30–60 min after seeding, the mean cloud droplet size increased, the droplet number concentration decreased, and large drop (e.g., diameter larger than 10 μm) concentration increased. Average drizzle rates increased from about 0.05 to 0.20mmh-1, and the liquid water path decreased from about 52 to 43 gm-2. Strong radar returns associated with drizzle were observed on the post-seeding cloud-base levelleg flights and were accompanied by a substantial depletion of the cloud liquid water content. The changes were large enough to suggest that the salt particles with concentrations estimated to be 10-2 to 10-4 cm-3 resulted in a four-fold increase in the cloud-base rainfall rate and depletion of the cloud water due to rainout. In contrast, a case is shown where the cloud was already precipitating (on 10 August) and the effect of adding GCCN to the cloud was insignificant.
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Article
Description
The article of record as published may be located at http://dx.doi.org/10.5194/acp-15-5645-2015
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Meteorology
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Sponsors
Funder
The E-PEACE field campaign and modeling studies were funded by the National Science Foundation (AGS-1013423; AGS-1008848; AGS-1013381; AGS-1013319; ATM-0744636; AGS-0821599; ATM-0349015) and the Office of Naval Research (N00014-11-1-0783; N00014-10-1-0811; N00014-10-1-0200; N00014-08-1-0465).
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Citation
E. Jung, et al, "Precipitation effects of giant cloud condensation nuclei artificially introduced into stratocumulus clouds," Atmospheric Chemistry and Physics, (2015), v.15, pp. 5645–5658 www.atmos-chem-phys.net/15/5645/2015/
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
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