Go to  Advanced Search

Constraints on droplet growth in radiatively cooled stratocumulus clouds

Show full item record

Files in this item

Files Size Format Description   View
Austin_AGU_1995_95JD01268.pdf 1.018Mb Adobe Portable Document Format   View/Open
 
Title: Constraints on droplet growth in radiatively cooled stratocumulus clouds
Author: Austin, Philip H.; Siems, Steven T.; Wang, Yinong
Issue Date: 1995-04-05
Publicly Available in cIRcle 2011-03-23
Publisher American Geophysical Union
Citation: Austin, Philip H., Siems, Steven T., Wang , Y. 1995. Constraints on droplet growth in radiatively cooled stratocumulus clouds, Journal of Geophysical Research Atmospheres, 100 (D7) 14231–14242. dx.doi.org/10.1029/95JD01268.
Abstract: Radiative cooling near the top of a layer cloud plays a dominant role in droplet condensation growth. The impact of this cooling on the evolution of small droplets and the formation of precipitation-sized drops is calculated using a microphysical model that includes radiatively driven condensation and coalescence. The cloud top radiative environment used for these calculations is determined using a mixed-layer model of a marine stratocumulus cloud with a subsiding, radiatively cooled inversion. Calculations of the radiatively driven equilibrium supersaturation show that net long wave emission by cloud droplets produces supersaturations below 0.04% for typical nocturnal conditions. While supersaturations as low as this will force evaporation for droplets smaller than ≈ 5 μm, radiatively enhanced growth for larger droplets can reduce the time required to produce precipitation-sized particles by a factor of 2–4, compared with droplets in a quiescent cloud without flux divergence. The impact of this radiative enhancement on the acceleration of coalescence is equivalent to that produced in updrafts of 0.1–0.5 ms−1, and varies linearly with the total emitted flux (the “radiative exchange”). An edited version of this paper was published by AGU. Copyright 1995 American Geophysical Union.
Affiliation: Earth and Ocean Sciences, Dept. of (EOS), Dept of
URI: http://hdl.handle.net/2429/32766
Peer Review Status: Reviewed
Scholarly Level: Faculty

This item appears in the following Collection(s)

Show full item record

All items in cIRcle are protected by copyright, with all rights reserved.

UBC Library
1961 East Mall
Vancouver, B.C.
Canada V6T 1Z1
Tel: 604-822-6375
Fax: 604-822-3893