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Detection and modeling of organic sp...

University of Colorado at Boulder., Chemistry.

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Detection and modeling of organic species and toxics in Mexico City.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Detection and modeling of organic species and toxics in Mexico City./
作者:	Dzepina, Katja.
面頁冊數:	243 p.
附註:	Advisers: Jose L. Jimenez; Sasha Madronich.
Contained By:	Dissertation Abstracts International70-04B.
標題:	Atmospheric Sciences. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoeng/servlet/advanced?query=3354579
ISBN:	9781109116656

Detection and modeling of organic species and toxics in Mexico City.
Dzepina, Katja.

Detection and modeling of organic species and toxics in Mexico City. - 243 p.

Advisers: Jose L. Jimenez; Sasha Madronich.

Thesis (Ph.D.)--University of Colorado at Boulder, 2009.

Recent research has clearly demonstrated the importance of atmospheric aerosols to human health, visibility, and the radiative forcing of climate. We report on findings from the Mexico City Metropolitan Area field campaign that took place in April 2003 (MCMA-2003). Ambient particle-bound polycyclic aromatic hydrocarbons (PAH) were quantified for the first time using a real-time aerosol mass spectrometer, and for the first time PAHs were quantified with two different real-time methods alongside filter-based measurements in an extended field campaign. We developed a subtraction method that allows the removal of the contribution from non-PAH organics to the ion signals of the PAHs in ambient data. We report the mass concentrations of individual groups of PAHs, as well as the total PAH mass. The time series of the PAH measured with Photoelectric Aerosol Sensor and quadrupole-based Aerodyne Aerosol Mass Spectrometer (Q-AMS) during MCMA-2003 are well correlated. Comparison of Q-AMS PAH measurements to those from GC-MS analysis of filter samples shows that several groups of PAHs agree well, while the Q-AMS measurements are larger than the GC-MS ones for several others. Results suggest that labile PAHs decayed rapidly due to reaction occurring during filter sampling.

ISBN: 9781109116656Subjects--Topical Terms:

1019179
Atmospheric Sciences.

Detection and modeling of organic species and toxics in Mexico City.
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100 1 $a Dzepina, Katja. $3 1019560
245 1 0 $a Detection and modeling of organic species and toxics in Mexico City.
300 $a 243 p.
500 $a Advisers: Jose L. Jimenez; Sasha Madronich.
500 $a Source: Dissertation Abstracts International, Volume: 70-04, Section: B, page: .
502 $a Thesis (Ph.D.)--University of Colorado at Boulder, 2009.
520 $a Recent research has clearly demonstrated the importance of atmospheric aerosols to human health, visibility, and the radiative forcing of climate. We report on findings from the Mexico City Metropolitan Area field campaign that took place in April 2003 (MCMA-2003). Ambient particle-bound polycyclic aromatic hydrocarbons (PAH) were quantified for the first time using a real-time aerosol mass spectrometer, and for the first time PAHs were quantified with two different real-time methods alongside filter-based measurements in an extended field campaign. We developed a subtraction method that allows the removal of the contribution from non-PAH organics to the ion signals of the PAHs in ambient data. We report the mass concentrations of individual groups of PAHs, as well as the total PAH mass. The time series of the PAH measured with Photoelectric Aerosol Sensor and quadrupole-based Aerodyne Aerosol Mass Spectrometer (Q-AMS) during MCMA-2003 are well correlated. Comparison of Q-AMS PAH measurements to those from GC-MS analysis of filter samples shows that several groups of PAHs agree well, while the Q-AMS measurements are larger than the GC-MS ones for several others. Results suggest that labile PAHs decayed rapidly due to reaction occurring during filter sampling.
520 $a We use the case study during MCMA-2003 to evaluate three new SOA models: (1) updated aromatic SOA yields from recent chamber experiments; (2) the formation of SOA from glyoxal; and (3) the formation of SOA from primary semivolatile and intermediate volatility species (primary S/IVOC or P-S/IVOC). We also evaluate the effect of reduced partitioning of SOA into POA. Traditional SOA precursors (mainly high-yield aromatics) by themselves still fail to produce enough SOA to match the observations by a factor of &sim;7. Glyoxal contributes several mug m-3 to SOA formation, with similar timing as the measurements. Gaseous P-S/IVOC species introduce a large amount of oxidizable carbon that was not in models before. Gaseous S/IVOC precursors have a high SOA yield, and this mechanism helps to close the gap in measured vs. modeled SOA mass for our case study. However the volatility of model SOA is too high and the O/C ratio is lower than observations. The sensitivities of the model to some key uncertain parameters are evaluated.
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650 4 $a Chemistry, Physical. $3 560527
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710 2 $a University of Colorado at Boulder. $b Chemistry. $3 1019559
773 0 $t Dissertation Abstracts International $g 70-04B.
790 $a 0051
790 1 0 $a de Gouw, Joost $e committee member
790 1 0 $a Jimenez, Jose L. $e committee member
790 1 0 $a Jimenez, Jose L., $e advisor
790 1 0 $a Madronich, Sasha $e committee member
790 1 0 $a Madronich, Sasha, $e advisor
790 1 0 $a Vaida, Veronica $e committee member
790 1 0 $a Volkamer, Rainer M. $e committee member
791 $a Ph.D.
792 $a 2009
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoeng/servlet/advanced?query=3354579