Zev Levin, William R. Cotton's Aerosol Pollution Impact on Precipitation A Scientific PDF

By Zev Levin, William R. Cotton

ISBN-10: 140208689X

ISBN-13: 9781402086892

ISBN-10: 1402086903

ISBN-13: 9781402086908

This booklet reports present wisdom at the dating among aerosols and precipitation attaining the Earth's floor. It contains a record of strategies which can aid to farther strengthen wisdom during this area.

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Extra resources for Aerosol Pollution Impact on Precipitation A Scientific Review

Example text

A diffusion chamber may take a variety of geometric configurations, with the essential feature being that particles are statically or dynamically (with continuous flow) exposed to a steady supersaturation field created either by wetted plates held at different temperatures or by a streamwise gradient of temperature. By varying the temperature difference between the plates it is possible to produce maximum supersaturations in the chamber that range from a few tenths of 1% to a few percent, which are similar to the inferred supersaturations that activate droplets in clouds (Wieland 1956).

The particles Lagrangian time scale may however be shorter. 5 km and characteristic updraft speeds of 3 m sÀ1, the Lagrangian time scale is tp=1500 m/3 m sÀ1=500 s ^8 min. This represents the time available for initiation of precipitable particles. Once initiated, precipitation may continue over the remaining lifetime of the cloud. In a towering cumulus cloud with depth of $10 km and updraft speeds of $15 m sÀ1, the Lagrangian time scale is tp=10,000 m/15 m sÀ1 ^ 660 s ^ 11 min, only slightly longer than shallow cumulus clouds.

Nevertheless, these particles can have a significant effect on the development of precipitation by serving as coalescence embryos (Johnson 1982; Feingold et al. R. Cotton, S. Yuter Yin et al. 2000a). The droplets that form are large enough for coalescence to start immediately even before the droplet reaches its critical size, based on the Kohler equation.

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Aerosol Pollution Impact on Precipitation A Scientific Review by Zev Levin, William R. Cotton


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