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Distributions and Formations of HONO...

Pu, Dennis.

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Distributions and Formations of HONO in the Troposphere.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Distributions and Formations of HONO in the Troposphere./
Author:	Pu, Dennis.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2015,
Description:	67 p.
Notes:	Source: Masters Abstracts International, Volume: 76-12.
Contained By:	Masters Abstracts International76-12.
Subject:	Atmospheric Chemistry. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1589645
ISBN:	9781321776607

Distributions and Formations of HONO in the Troposphere.
Pu, Dennis.

Distributions and Formations of HONO in the Troposphere. - Ann Arbor : ProQuest Dissertations & Theses, 2015 - 67 p.

Source: Masters Abstracts International, Volume: 76-12.

Thesis (M.S.)--State University of New York at Albany, 2015.

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

Nitrous acid (HONO) is an important reactive nitrogen species and a precursor to the hydroxyl radical. It plays important roles in reactive nitrogen recycling and in photo-oxidant formation in the troposphere. However, much is still unknown about its formation mechanisms and distributions in the troposphere. This research is part of NOMADSS (Nitrogen, Oxidants, Mercury, and Aerosol Distributions, Sources and Sinks) field study contributed by over 10 research groups in the United States to investigate the tropospheric chemistry of reactive nitrogen, mercury, oxidant and aerosols. One of the goals was to study the HONO distribution and formation mechanisms in the troposphere. The observed HONO mixing ratios ranged from low ppt levels in the background ambient air to 70 ppt in biomass burning plumes in the free troposphere, and from 6 to 20 ppt in the background boundary layer, to a maximum of 82 ppt in power plant plumes. HONO sources and sinks are analyzed, and three cases in different atmospheres were studied: clean marine air, background continental ambient air, and power plant plumes. Photolysis is the dominant HONO sink throughout the troposphere during the day; particulate nitrate photolysis is the main HONO source in clean marine air and in the background continental air, while NOx is the dominant HONO precursor via its gas-phase and heterogeneous reactions within the industrial plumes. No significant nighttime accumulation of HONO was observed in the air mass isolated from ground surface. The conclusion from this study is that photolysis of particulate nitrate is a major daytime source of HONO in the low-NOx troposphere and is an important pathway to recycle HNO3/nitrate back to photochemically reactive NOx (re-NOx-ification).

ISBN: 9781321776607Subjects--Topical Terms:

1669583
Atmospheric Chemistry.

Distributions and Formations of HONO in the Troposphere.
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500 $a Source: Masters Abstracts International, Volume: 76-12.
500 $a Publisher info.: Dissertation/Thesis.
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506 $a This item must not be sold to any third party vendors.
520 $a Nitrous acid (HONO) is an important reactive nitrogen species and a precursor to the hydroxyl radical. It plays important roles in reactive nitrogen recycling and in photo-oxidant formation in the troposphere. However, much is still unknown about its formation mechanisms and distributions in the troposphere. This research is part of NOMADSS (Nitrogen, Oxidants, Mercury, and Aerosol Distributions, Sources and Sinks) field study contributed by over 10 research groups in the United States to investigate the tropospheric chemistry of reactive nitrogen, mercury, oxidant and aerosols. One of the goals was to study the HONO distribution and formation mechanisms in the troposphere. The observed HONO mixing ratios ranged from low ppt levels in the background ambient air to 70 ppt in biomass burning plumes in the free troposphere, and from 6 to 20 ppt in the background boundary layer, to a maximum of 82 ppt in power plant plumes. HONO sources and sinks are analyzed, and three cases in different atmospheres were studied: clean marine air, background continental ambient air, and power plant plumes. Photolysis is the dominant HONO sink throughout the troposphere during the day; particulate nitrate photolysis is the main HONO source in clean marine air and in the background continental air, while NOx is the dominant HONO precursor via its gas-phase and heterogeneous reactions within the industrial plumes. No significant nighttime accumulation of HONO was observed in the air mass isolated from ground surface. The conclusion from this study is that photolysis of particulate nitrate is a major daytime source of HONO in the low-NOx troposphere and is an important pathway to recycle HNO3/nitrate back to photochemically reactive NOx (re-NOx-ification).
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