Details:

Personal Author:
Pueschel, R. F. ; Mamane, Y. ; Van Valin, C. C. ; Cobb, W. E. ; Parungo, F. P. ; ... More +
Pueschel, R. F. ; Mamane, Y. ; Van Valin, C. C. ; Cobb, W. E. ; Parungo, F. P. ; Wellman, D. L. Less -
Corporate Authors:
Environmental Research Laboratories (U.S.). Office of Weather Research and Modification
NOAA Program & Office:
OAR (Oceanic and Atmospheric Research)
Description:
Cloud condensation nuclei (CCN: particles active at <1% supersaturation) were found to be formed in the plume of the Four Corners power plant at the rate of ca. 1016s 1 and CCN concentrations were often found to increase with increasing distance of up to 80 km from the power plant. Condensation nuclei (CN: particles active at 300% supersaturation) were formed at the rate of ca. 1017s 1. The greatest concentrations of CN were found at distances of less than 40 km downwind, although the total CN population was greater at the greater distances, thus indicating an increase in mean particle size with increasing time of reaction, i.e., increasing distance. This is corroborated by the size distribution measurements showing a gradually increasing modal radius and increasing concentrations of the accumulation mode with increasing distances. Most particles of r < 0.25 pm are sulfates; most larger particles are fly ash. Fly ash particles are found to adsorb sulfate, thus becoming activated as CCN. Submicron fly ash particles can accumulate water-soluble sulfates by surface oxidation of S02 in amounts between 2% and 45%, depending on fly ash particle size, at residence times between 0.3 and 12.5 hours. The relationship between concentration of surface-deposited sulfate and inverse particle diameter suggests that sulfur is adsorbed and oxidized on refractory fly ash in the high temperature zone of the boiler. Little or no accumulation of sulfur and/or chlorine could be detected after the fly ash became airborne. The surface oxidation of sulfur is too small to compete with the gas phase oxidation, or to play a role in the technology of sulfur emission control. The accumulation of a soluble sulfate coating is implicated in the passivation of fly ash particles as ice nuclei. Calculation of IR heating or cooling rates shows that an aerosol layer trapped below an inversion may act to strengthen the inversion by cooling from the top of the aerosol layer.
Keywords:
[+]
Aerosols Coal-fired Power Plants Pollution
Series:
NOAA technical memorandum ERL OWRM ; 2
Document Type:
Technical Memorandum
Place as Subject:
New Mexico
License:
https://creativecommons.org/publicdomain/zero/1.0/
Rights Information:
CC0 Public Domain
Compliance:
Library
Main Document Checksum:
[+]
urn:sha256:434d3c0b969dc1c5ed25bcd0c5438f128e50e5d437908b77f405e246777fc0e0
Download URL:
https://repository.library.noaa.gov/view/noaa/32763/noaa_32763_DS1.pdf
File Type:

Supporting Files

• No Additional Files

More +