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Measuring Soil Emissions of Reactive...

Payne, Zachary Coffman.

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

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Measuring Soil Emissions of Reactive Nitrogen Oxides: Instrument Design, Field Deployment, and Modeling./
作者:	Payne, Zachary Coffman.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2022,
面頁冊數:	259 p.
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:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29253489
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. - Ann Arbor : ProQuest Dissertations & Theses, 2022 - 259 p.

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

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

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

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.

ISBN: 9798834038122Subjects--Topical Terms:

3168300
Analytical chemistry.
Subjects--Index Terms:

Nitrogen

Measuring Soil Emissions of Reactive Nitrogen Oxides: Instrument Design, Field Deployment, and Modeling.
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500 $a Source: Dissertations Abstracts International, Volume: 84-01, Section: B.
500 $a Advisor: Raff, Jonathan.
502 $a Thesis (Ph.D.)--Indiana University, 2022.
506 $a This item must not be sold to any third party vendors.
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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650 4 $a Environmental science. $3 677245
653 $a Nitrogen
653 $a Nitrogen Flux
653 $a Reactive Nitrogen
653 $a Soil Emissions
690 $a 0486
690 $a 0768
710 2 $a Indiana University. $b Chemistry. $3 1020748
773 0 $t Dissertations Abstracts International $g 84-01B.
790 $a 0093
791 $a Ph.D.
792 $a 2022
793 $a English
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