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Type of Document	Dissertation
Author	Varutbangkul, Varuntida
Author's Email Address	tomtor AT caltech.edu
URN	etd-05242006-175333
Persistent URL	http://resolver.caltech.edu/CaltechETD:etd-05242006-175333
Title	Ambient and laboratory studies of aerosol size distributions and hygroscopicity
Degree	PhD
Option	Chemical Engineering
Advisory Committee	Advisor Name Title John H. Seinfeld Committee Chair Haflidi Jonsson Committee Member Michael R. Hoffmann Committee Member Richard C. Flagan Committee Member
Keywords	HTDMA SOA secondary organic aerosol smog chamber water uptake
Date of Defense	2006-05-22
Availability	mixed
Abstract The optical properties, health effects, atmospheric lifetime, and climate impact of ambient aerosols are influenced directly by their size distribution, chemical composition, and phase. The aerosol hygroscopicity, which is also a function of composition, governs the size and phase changes of these particles when subjected to varying ambient relative humidities (RH). This thesis presents results from a wide variety of studies involving laboratory and ambient measurements of aerosol size distributions and water uptake properties in the subsaturated regime. Time evolutions of particle size and hygroscopic growth were investigated for various secondary organic aerosol (SOA) systems generated in a smog chamber from ozonolysis of cycloalkenes and photooxidation of biogenic terpenes. SOA yields were measured at various initial parent hydrocarbon concentrations and correlated with the structure of the parent compound. The amount of water uptake of the aerosol at a reference RH was found to inversely correlate with the SOA yield. The hygroscopicity of many atmospherically relevant pure organic species was also studied using an unconventional particle generation scheme employing a nonaqueous solution. Experimental results were compared with predictions from an equilibrium thermodynamic model. In these works, organic aerosols are shown to exhibit complex hygroscopic growth, dependent on the particle chemistry, phase, and surrounding RH. Implications of the experimental techniques used on the observation of particle growth, deliquescence, and efflorescence are discussed. A number of other studies incorporating aircraft-based measurements of aerosol size distributions and hygroscopicity with other ambient measurements into various cloud microphysics models are also presented.
Files	Filename       Size       Approximate Download Time (Hours:Minutes:Seconds)     28.8 Modem   56K Modem   ISDN (64 Kb)   ISDN (128 Kb)   Higher-speed Access    01_Title_Intro.pdf 278.85 Kb 00:01:17 00:00:39 00:00:34 00:00:17 00:00:01   02_Cycloalkene_SOA_yields.pdf 619.57 Kb 00:02:52 00:01:28 00:01:17 00:00:38 00:00:03   03_SOA_hygroscopicity.pdf 1.71 Mb 00:07:54 00:04:04 00:03:33 00:01:46 00:00:09   05_Conclusions_future_work.pdf 97.02 Kb 00:00:26 00:00:13 00:00:12 00:00:06 < 00:00:01   Appendix_A.pdf 1.48 Mb 00:06:52 00:03:31 00:03:05 00:01:32 00:00:07   Appendix_B.pdf 1.75 Mb 00:08:04 00:04:09 00:03:38 00:01:49 00:00:09   Appendix_C.pdf 1.72 Mb 00:07:57 00:04:05 00:03:34 00:01:47 00:00:09   Appendix_D.pdf 3.83 Mb 00:17:45 00:09:07 00:07:59 00:03:59 00:00:20   Appendix_E.pdf 678.73 Kb 00:03:08 00:01:36 00:01:24 00:00:42 00:00:03   Appendix_F.pdf 1.27 Mb 00:05:53 00:03:01 00:02:39 00:01:19 00:00:06   Appendix_G.pdf 1.46 Mb 00:06:45 00:03:28 00:03:02 00:01:31 00:00:07   Appendix_H.pdf 948.34 Kb 00:04:23 00:02:15 00:01:58 00:00:59 00:00:05   Appendix_I.pdf 2.00 Mb 00:09:16 00:04:46 00:04:10 00:02:05 00:00:10   Appendix_J.pdf 487.93 Kb 00:02:15 00:01:09 00:01:00 00:00:30 00:00:02   Appendix_K.pdf 715.59 Kb 00:03:18 00:01:42 00:01:29 00:00:44 00:00:03   Appendix_L.pdf 2.36 Mb 00:10:54 00:05:36 00:04:54 00:02:27 00:00:12   Appendix_M.pdf 1.97 Mb 00:09:07 00:04:41 00:04:06 00:02:03 00:00:10   Appendix_N.pdf 3.54 Mb 00:16:22 00:08:25 00:07:22 00:03:41 00:00:18 There are 1 files which have been withheld at the author's request. indicates that a file or directory is accessible from the campus network only and must not be distributed to non-campus persons.