Phase changes in internally mixed organic/sulfate aerosols

Brooks, Sarah D.; Prenni, Anthony J.; Wise, Matthew E.; Tolbert, Margaret A.
August 2000
AIP Conference Proceedings;2000, Vol. 534 Issue 1, p728
Academic Journal
Using a temperature controlled flow tube system equipped with FTIR detection of particle phase and relative humidity, we have measured the deliquescence (uptake of water) and efflorescence (loss of water) of internally mixed ammonium sulfate/maleic acid particles. Our results indicate that crystalline ammonium sulfate particles remain dry until reaching a deliquescence relative humidity of approximately 81%. In contrast, internally mixed particles deliquesce at significantly lower relative humidities. Results are presented for the deliquescence and efflorescence phase changes of mixed ammonium sulfate/maleic acid aerosols as a function of maleic acid wt%. The results suggest that the presence of water-soluble organics in tropospheric aerosol could alter the conditions under which phase changes occur in the atmosphere.


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