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Development and deployment of instru...

Hansen, Robert Frederick.

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Development and deployment of instrumentation to measure total hydroxyl radical reactivity in the atmosphere.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Development and deployment of instrumentation to measure total hydroxyl radical reactivity in the atmosphere./
作者:	Hansen, Robert Frederick.
面頁冊數:	234 p.
附註:	Source: Dissertation Abstracts International, Volume: 75-06(E), Section: B.
Contained By:	Dissertation Abstracts International75-06B(E).
標題:	Atmospheric Chemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3612222
ISBN:	9781303735721

Development and deployment of instrumentation to measure total hydroxyl radical reactivity in the atmosphere.
Hansen, Robert Frederick.

Development and deployment of instrumentation to measure total hydroxyl radical reactivity in the atmosphere. - 234 p.

Source: Dissertation Abstracts International, Volume: 75-06(E), Section: B.

Thesis (Ph.D.)--Indiana University, 2014.

This item must not be sold to any third party vendors.

The hydroxyl radical (OH) is an important atmospheric oxidant that plays a key role in the formation of tropospheric ozone and secondary organic aerosols and controls the lifetime of atmospheric trace gases that contribute to global climate change. A complete understanding of OH sources and sinks is therefore essential to understand these processes. Total hydroxyl radical (OH) reactivity, the inverse of the lifetime of OH, is an important metric of OH chemistry and can be used to investigate OH sources and sinks. Notably, OH reactivity has been used to investigate OH sink budgets by comparing the OH reactivity calculated from measurements of trace gas concentrations to that measured directly by one of several techniques. Comparisons of measured and calculated OH reactivity from field measurement campaigns have yielded discrepancies in both urban and forested environments, which suggest the presence of unknown OH sinks.

ISBN: 9781303735721Subjects--Topical Terms:

1669583
Atmospheric Chemistry.

Development and deployment of instrumentation to measure total hydroxyl radical reactivity in the atmosphere.
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245 1 0 $a Development and deployment of instrumentation to measure total hydroxyl radical reactivity in the atmosphere.
300 $a 234 p.
500 $a Source: Dissertation Abstracts International, Volume: 75-06(E), Section: B.
500 $a Adviser: Philip S. Stevens.
502 $a Thesis (Ph.D.)--Indiana University, 2014.
506 $a This item must not be sold to any third party vendors.
506 $a This item must not be added to any third party search indexes.
520 $a The hydroxyl radical (OH) is an important atmospheric oxidant that plays a key role in the formation of tropospheric ozone and secondary organic aerosols and controls the lifetime of atmospheric trace gases that contribute to global climate change. A complete understanding of OH sources and sinks is therefore essential to understand these processes. Total hydroxyl radical (OH) reactivity, the inverse of the lifetime of OH, is an important metric of OH chemistry and can be used to investigate OH sources and sinks. Notably, OH reactivity has been used to investigate OH sink budgets by comparing the OH reactivity calculated from measurements of trace gas concentrations to that measured directly by one of several techniques. Comparisons of measured and calculated OH reactivity from field measurement campaigns have yielded discrepancies in both urban and forested environments, which suggest the presence of unknown OH sinks.
520 $a An atmospheric-pressure flow tube instrument for the measurement of total OH reactivity that operates under turbulent flow conditions has been developed, constructed, characterized, and deployed in two major field measurement campaigns. The 2009 Community Atmosphere-Biosphere INteraction EXperiment (CABINEX) campaign, was conducted in a forest in northern Michigan, and the 2010 California Research as the Nexus of Air Quality and Climate Change (CalNex) campaign, which was conducted in Pasadena, California. A description of the instrument, as well as results and analysis for the CABINEX and CalNex campaigns, are presented in this dissertation.
520 $a Discrepancies between the measured and calculated total OH reactivity were observed during the CABINEX and CalNex campaigns, suggesting that there were OH sinks that were not captured by trace species measurements. To ascertain the sources of this discrepancy, the measurements were supplemented by computer modeling employing the Master Chemical Mechanism (MCM). Analysis of the results suggests that the discrepancy may be caused by unmeasured products of trace gas oxidation, which may occur locally or during long-range transport.
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793 $a English
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