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Ambient organic aerosols: Where they...

University of California, Santa Cruz.

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Ambient organic aerosols: Where they come from, and where they are going (some more slowly than others).

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Ambient organic aerosols: Where they come from, and where they are going (some more slowly than others)./
Author:	Ruehl, Christopher R.
Description:	190 p.
Notes:	Adviser: Patrick Chuang.
Contained By:	Dissertation Abstracts International70-03B.
Subject:	Atmospheric Sciences. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoeng/servlet/advanced?query=3351051
ISBN:	9781109067729

Ambient organic aerosols: Where they come from, and where they are going (some more slowly than others).
Ruehl, Christopher R.

Ambient organic aerosols: Where they come from, and where they are going (some more slowly than others). - 190 p.

Adviser: Patrick Chuang.

Thesis (Ph.D.)--University of California, Santa Cruz, 2009.

Although the inorganic component of ambient aerosols is relatively well understood, many questions remain concerning organic aerosols. One is whether some organic aerosols are kinetically limited from acting as cloud condensation nuclei (CCN). In the summer of 2006, we measured the rate of cloud droplet formation on atmospheric particles sampled at four sites across the United States. Overall, most ambient CCN grew at a rate similar to ammonium sulfate, but approximately one third grew more slowly. We made similar measurements in the summer of 2007 at a coastal California site. We observed persistent bimodal diameter spectra, and the slowly-growing mode contained 10-25% of all particles and had mass accommodation coefficients 10 -- 30 times smaller than that measured for ammonium sulfate.

ISBN: 9781109067729Subjects--Topical Terms:

1019179
Atmospheric Sciences.

Ambient organic aerosols: Where they come from, and where they are going (some more slowly than others).
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020 $a 9781109067729
035 $a (UMI)AAI3351051
035 $a AAI3351051
040 $a UMI $c UMI
100 1 $a Ruehl, Christopher R. $3 1019537
245 1 0 $a Ambient organic aerosols: Where they come from, and where they are going (some more slowly than others).
300 $a 190 p.
500 $a Adviser: Patrick Chuang.
500 $a Source: Dissertation Abstracts International, Volume: 70-03, Section: B, page: .
502 $a Thesis (Ph.D.)--University of California, Santa Cruz, 2009.
520 $a Although the inorganic component of ambient aerosols is relatively well understood, many questions remain concerning organic aerosols. One is whether some organic aerosols are kinetically limited from acting as cloud condensation nuclei (CCN). In the summer of 2006, we measured the rate of cloud droplet formation on atmospheric particles sampled at four sites across the United States. Overall, most ambient CCN grew at a rate similar to ammonium sulfate, but approximately one third grew more slowly. We made similar measurements in the summer of 2007 at a coastal California site. We observed persistent bimodal diameter spectra, and the slowly-growing mode contained 10-25% of all particles and had mass accommodation coefficients 10 -- 30 times smaller than that measured for ammonium sulfate.
520 $a While much aerosol hygroscopicity data is available at lower relative humidities (RH) and at supersaturations (RH> 100%), relatively little data is available at high RH (99.2--99.9%). We measured the size of droplets at high RH that had formed on particles composed of one of seven compounds with dry diameters between 0.1 and 0.5 mum. The hygroscopicity of the inorganic compounds was relatively constant with both RH and Dwet. In contrast, most organics, particularly sodium dodecyl sulfate (SDS), showed a slight to mild increase in hygroscopicity with Dwet. This suggests that surface partitioning tends to cancel out the increase in hygroscopicity due to surface tension reduction, increasingly so at low Dwet. SDS hygroscopicity did not decrease at lower RH, as would be expected if micelles formed. These results suggest that surface-activity parameters obtained from macroscopic solutions with organic solutes may be inappropriate for calculations of the hygroscopicity of micron-sized droplets.
520 $a Finally, we examined possible sources of ambient organic aerosols. A new analytical technique for aersol water-soluble organic carbon (WSOC) was applied to samples collected at four sites across the United States. It involves the separation of samples by size-exclusion chromatography, followed by the measurement of the 13C content. We observed a pattern of 13C depletion in molecules with larger hydrodynamic diameters in Tennessee, indicating that oligomerization reactions produce secondary aerosol where biogenic emissions such as terpenes are prevalent.
590 $a School code: 0036.
650 4 $a Atmospheric Sciences. $3 1019179
690 $a 0725
710 2 $a University of California, Santa Cruz. $3 1018764
773 0 $t Dissertation Abstracts International $g 70-03B.
790 $a 0036
790 1 0 $a Chuang, Patrick, $e advisor
791 $a Ph.D.
792 $a 2009
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoeng/servlet/advanced?query=3351051