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Measuring Soil Emissions of Reactive Nitrogen Oxides : = Instrument Design, Field Deployment, and Modeling.

紀錄類型:	書目-語言資料,手稿 : Monograph/item
正題名/作者:	Measuring Soil Emissions of Reactive Nitrogen Oxides :/
其他題名:	Instrument Design, Field Deployment, and Modeling.
作者:	Payne, Zachary Coffman.
面頁冊數:	1 online resource (259 pages)
附註:	Source: Dissertations Abstracts International, Volume: 84-01, Section: B.
Contained By:	Dissertations Abstracts International84-01B.
標題:	Analytical chemistry. -
電子資源:	click for full text (PQDT)
ISBN:	9798834038122

Measuring Soil Emissions of Reactive Nitrogen Oxides : = Instrument Design, Field Deployment, and Modeling.
Payne, Zachary Coffman.

Measuring Soil Emissions of Reactive Nitrogen Oxides :Instrument Design, Field Deployment, and Modeling. - 1 online resource (259 pages)

Source: Dissertations Abstracts International, Volume: 84-01, Section: B.

Thesis (Ph.D.)--Indiana University, 2022.

Includes bibliographical references

An array of automated dynamic flux chambers was built and deployed during a field campaign aimed at studying how biogenic soil emissions of nitric oxide (NO), nitrogen dioxide (NO2), and nitrous oxide (N2O) are impacted by soil vegetation. We found that the amount and ratio of NO-to-N2O depended on soil moisture, which in turn is impacted by the vegetation ground cover density. Precipitation caused pulses in total nitrogen emissions that were more pronounced in plots of bare soil vs vegetated soil, an observation attributed to nitrate that had accumulated in bare soil due to the lack of plant uptake. Fluxes of NO and NO2 measured at this site were used in combination with measurements of hydroxyl radical (OH), hydroperoxy radical + organoperoxy radical (HO2 + RO2), ozone (O3), and volatile organic compounds (VOCs). These field observations were used within the Framework for 0-D Atmospheric Modeling (F0AM) to show that NO emissions are a significant driver of local OH radical production during the late afternoon and evening (20-90%) but are considerably less significant source of peak noontime OH radical concentrations (< 20%). Following precipitation events, soil emissions became the dominant source of NO (50-80%) that sustained radical propagation throughout the day. The base model underestimated HONO concentrations relative to concentrations measured at the site during a separate campaign but were accounted for in the model by inclusion of estimated soil emissions of HONO and abiotic heterogenous chemistry. Lastly, we describe a novel approach to measure HONO at sub-ppb levels using commercially available NO chemiluminescence instruments. The new method was compared to a chemical ionization mass spectrometer during indoor air and chamber experiments. Excellent agreement was achieved between these two instruments. The new system is capable of measuring NO, NO2, and HONO mixing ratios at atmospherically relevant levels.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798834038122Subjects--Topical Terms:

1182118
Analytical chemistry.
Subjects--Index Terms:

NitrogenIndex Terms--Genre/Form:

554714
Electronic books.

Measuring Soil Emissions of Reactive Nitrogen Oxides : = Instrument Design, Field Deployment, and Modeling.
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520 $a An array of automated dynamic flux chambers was built and deployed during a field campaign aimed at studying how biogenic soil emissions of nitric oxide (NO), nitrogen dioxide (NO2), and nitrous oxide (N2O) are impacted by soil vegetation. We found that the amount and ratio of NO-to-N2O depended on soil moisture, which in turn is impacted by the vegetation ground cover density. Precipitation caused pulses in total nitrogen emissions that were more pronounced in plots of bare soil vs vegetated soil, an observation attributed to nitrate that had accumulated in bare soil due to the lack of plant uptake. Fluxes of NO and NO2 measured at this site were used in combination with measurements of hydroxyl radical (OH), hydroperoxy radical + organoperoxy radical (HO2 + RO2), ozone (O3), and volatile organic compounds (VOCs). These field observations were used within the Framework for 0-D Atmospheric Modeling (F0AM) to show that NO emissions are a significant driver of local OH radical production during the late afternoon and evening (20-90%) but are considerably less significant source of peak noontime OH radical concentrations (< 20%). Following precipitation events, soil emissions became the dominant source of NO (50-80%) that sustained radical propagation throughout the day. The base model underestimated HONO concentrations relative to concentrations measured at the site during a separate campaign but were accounted for in the model by inclusion of estimated soil emissions of HONO and abiotic heterogenous chemistry. Lastly, we describe a novel approach to measure HONO at sub-ppb levels using commercially available NO chemiluminescence instruments. The new method was compared to a chemical ionization mass spectrometer during indoor air and chamber experiments. Excellent agreement was achieved between these two instruments. The new system is capable of measuring NO, NO2, and HONO mixing ratios at atmospherically relevant levels.
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