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Development and field-deployment of an absorption spectrometer to measure atmospheric nitrous acid and nitrite.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Development and field-deployment of an absorption spectrometer to measure atmospheric nitrous acid and nitrite./
Author:	Lee, Hwan Kyu.
Description:	1 online resource (156 pages)
Notes:	Source: Dissertation Abstracts International, Volume: 73-11(E), Section: B.
Contained By:	Dissertation Abstracts International73-11B(E).
Subject:	Atmospheric chemistry. -
Online resource:	click for full text (PQDT)
ISBN:	9781267452467

Development and field-deployment of an absorption spectrometer to measure atmospheric nitrous acid and nitrite.
Lee, Hwan Kyu.

Development and field-deployment of an absorption spectrometer to measure atmospheric nitrous acid and nitrite. - 1 online resource (156 pages)

Source: Dissertation Abstracts International, Volume: 73-11(E), Section: B.

Thesis (Ph.D.)--Harvard University, 2012.

Includes bibliographical references

Field observations show daytime HONO levels in urban, rural and remote environments are greater than those expected at photostationary state, that is, balance between production by NO+OH reaction and loss by UV-photolysis and OH-oxidation. Studies have interpreted measurements of [HONO]Obs > [HONO]PSS - or equivalently, the rate of HONO loss exceeding that of production - as evidence of a missing, sunlight-driven HONO source. Formation rate inferred from assuming photostationarity indicate a significant source of HONO, which photolyzes to yield OH. Moreover, depending on the mechanism, it may represent a pathway by which deposited nitrogen oxides are repartitioned back into the atmosphere in reactive form.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9781267452467Subjects--Topical Terms:

639403
Atmospheric chemistry.
Index Terms--Genre/Form:

554714
Electronic books.

Development and field-deployment of an absorption spectrometer to measure atmospheric nitrous acid and nitrite.
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100 1 $a Lee, Hwan Kyu. $3 1193120
245 1 0 $a Development and field-deployment of an absorption spectrometer to measure atmospheric nitrous acid and nitrite.
264 0 $c 2012
300 $a 1 online resource (156 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
500 $a Source: Dissertation Abstracts International, Volume: 73-11(E), Section: B.
500 $a Adviser: Steven C. Wofsy.
502 $a Thesis (Ph.D.)--Harvard University, 2012.
504 $a Includes bibliographical references
520 $a Field observations show daytime HONO levels in urban, rural and remote environments are greater than those expected at photostationary state, that is, balance between production by NO+OH reaction and loss by UV-photolysis and OH-oxidation. Studies have interpreted measurements of [HONO]Obs > [HONO]PSS - or equivalently, the rate of HONO loss exceeding that of production - as evidence of a missing, sunlight-driven HONO source. Formation rate inferred from assuming photostationarity indicate a significant source of HONO, which photolyzes to yield OH. Moreover, depending on the mechanism, it may represent a pathway by which deposited nitrogen oxides are repartitioned back into the atmosphere in reactive form.
520 $a The accumulation of HONO beneath the nocturnal boundary layer initiates photochemistry in the early morning prior to other HOx precursors. Previous studies have estimated nighttime HONO production rate by attributing the increase in HONO:NOx solely to heterogeneous HONO formation, while treating NOx as an invariant. Moreover, because ambient HONO:NO x exceed what is observed in automobile exhaust, combustion sources are discounted.
520 $a In May of 2009, we observed HONO and NO2 mixing ratios in Houston during the SHARP campaign. We demonstrate -- using a chemical box model -- that photostationary state during daytime is not fully established. The reaction/transport time since emission from automobiles is short relative to the lifetime of HONO. The result of assuming PSS is a drastic over-estimation of the so-called missing HONO source. At night, we show that NOx oxidation and emission are significant, thus, NOx cannot be treated as a conservative tracer to infer secondary HONO production.
520 $a Nearly-continuous observations of HONO and NO2 at Harvard Forest from December 2010 to December 2011 reveal daytime HONO levels that are comparable to what is expected from known chemistry and much lower than has been reported in similar environments by different measurement techniques. Moreover, HONO fluxes are always below detection limit, indicating daytime HONO production contributes negligibly to the HOx and NOx budgets of the overlying atmosphere at Harvard Forest. Nighttime HONO enhancement is observed, but high night-to-night variability in HONO:NO 2 that is not reasonably explained by the trends in HONO and NO 2 fluxes, suggest a non-NO2, non-ground/canopy-surface related HONO source.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2018
538 $a Mode of access: World Wide Web
650 4 $a Atmospheric chemistry. $3 639403
650 4 $a Environmental science. $3 1179128
655 7 $a Electronic books. $2 local $3 554714
690 $a 0371
690 $a 0768
710 2 $a ProQuest Information and Learning Co. $3 1178819
710 2 $a Harvard University. $b Engineering and Applied Sciences. $3 1193121
773 0 $t Dissertation Abstracts International $g 73-11B(E).
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3514441 $z click for full text (PQDT)