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Ecosystem scale fluxes of total and ...

Lee, Anita.

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Ecosystem scale fluxes of total and speciated monoterpenes: Implications of gas- and particle-phase atmospheric chemistry.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Ecosystem scale fluxes of total and speciated monoterpenes: Implications of gas- and particle-phase atmospheric chemistry./
作者:	Lee, Anita.
面頁冊數:	250 p.
附註:	Source: Dissertation Abstracts International, Volume: 67-08, Section: B, page: 4321.
Contained By:	Dissertation Abstracts International67-08B.
標題:	Biogeochemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3228391
ISBN:	9780542825439

Ecosystem scale fluxes of total and speciated monoterpenes: Implications of gas- and particle-phase atmospheric chemistry.
Lee, Anita.

Ecosystem scale fluxes of total and speciated monoterpenes: Implications of gas- and particle-phase atmospheric chemistry. - 250 p.

Source: Dissertation Abstracts International, Volume: 67-08, Section: B, page: 4321.

Thesis (Ph.D.)--University of California, Berkeley, 2006.

To improve our understanding of the atmospheric impacts of terpenes, this dissertation describes results from above-canopy flux and branch enclosure measurements of terpenes in a pine forest, and results of laboratory experiments examining terpene oxidation. Measurements of total monoterpene flux by proton transfer reaction mass spectrometry coupled to eddy covariance (PTR-MS-EC) indicated that simultaneous measurements of eight speciated monoterpenes, using gas chromatography with relaxed eddy accumulation (GC-FID-REA), measured the longer-lived monoterpenes well, but additional terpenes were emitted that represented an important contribution to the total mixing ratio particularly at night. Previous measurements of vertical concentration gradients using PTR-MS in the forest clearly showed formation of compounds, identified by their mass to charge ratio (m/z), including m/z 113 and 111, in and above the forest canopy from the oxidation of biogenic emissions. Results from branch enclosure measurements using PTR-MS and GC-FID confirmed that several short-lived monoterpene species, e.g., myrcene, terpinolene, and alpha-terpinene, contributed a larger fraction to the total terpene mixing ratio when O3 concentrations were low, and coincided with a reduction in oxidation product ions measured by PTR-MS, indicating these terpenes contribute to in-canopy reactivity.

ISBN: 9780542825439Subjects--Topical Terms:

545717
Biogeochemistry.

Ecosystem scale fluxes of total and speciated monoterpenes: Implications of gas- and particle-phase atmospheric chemistry.
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245 1 0 $a Ecosystem scale fluxes of total and speciated monoterpenes: Implications of gas- and particle-phase atmospheric chemistry.
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502 $a Thesis (Ph.D.)--University of California, Berkeley, 2006.
520 $a To improve our understanding of the atmospheric impacts of terpenes, this dissertation describes results from above-canopy flux and branch enclosure measurements of terpenes in a pine forest, and results of laboratory experiments examining terpene oxidation. Measurements of total monoterpene flux by proton transfer reaction mass spectrometry coupled to eddy covariance (PTR-MS-EC) indicated that simultaneous measurements of eight speciated monoterpenes, using gas chromatography with relaxed eddy accumulation (GC-FID-REA), measured the longer-lived monoterpenes well, but additional terpenes were emitted that represented an important contribution to the total mixing ratio particularly at night. Previous measurements of vertical concentration gradients using PTR-MS in the forest clearly showed formation of compounds, identified by their mass to charge ratio (m/z), including m/z 113 and 111, in and above the forest canopy from the oxidation of biogenic emissions. Results from branch enclosure measurements using PTR-MS and GC-FID confirmed that several short-lived monoterpene species, e.g., myrcene, terpinolene, and alpha-terpinene, contributed a larger fraction to the total terpene mixing ratio when O3 concentrations were low, and coincided with a reduction in oxidation product ions measured by PTR-MS, indicating these terpenes contribute to in-canopy reactivity.
520 $a To determine whether these observations are consistent with terpene oxidation products, ozonolysis experiments of ten and photooxidation experiments of sixteen terpenes were conducted at the Caltech Indoor Chamber Facility. Many products were observed with PTR-MS, including formaldehyde, acetaldehyde, and acetone, as well as numerous unidentified products characterized by their m/z. First- and second-generation products were clearly formed, and many of the unidentified products, including m/z 113 and 111, were also observed in the pine forest canopy, confirming that the in-canopy observations are consistent with terpene oxidation, and that many product ions can serve as markers for reactive chemistry. SOA yields from terpene oxidation showed significant variation (1--68%), and the varying yields of SOA and atmospherically important gas-phase products from the different terpenes suggest that terpenes are not a homogeneous class of VOCs. Thus, modeling studies that characterize the gas and particle production of only a few monoterpenes do not appropriately constrain the impact of terpene emissions on local, regional, or global scales.
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