NOx source apportionment in a coastal urban air shed using stable isotope techniques

Simple item page
dc.contributor.authorShealy, Kaiya
dc.contributor.authorFelix, J. David
dc.date.accessioned2022-06-22T18:10:21Z
dc.date.available2022-06-22T18:10:21Z
dc.date.issued2022-04
dc.description.abstractNOx (NO + NO2) emission decreases urban air quality and its subsequent deposition can be a significant source of excess nitrogen loading to coastal waters. Photochemical reactions between volatile organic com- pounds, and NOx in the atmosphere creates ozone (O3). Previous studies suggest that the City of Corpus Christi is in a NOx limited zone, so an increase in NOx would lead to an increase in O3. The first step to NOx emission mitigation is to quantify the contributions of NOx sources. This study uses stable isotope techniques to measure point and nonpoint NOx sources in order to quantify three main NOx sources in the Corpus Christi air shed: vehicular, biogenic, and industrial sources. Each of these sources have unique iso- topic compositions or “source signatures”, specifically 15N-NOx values, which are different for each source and allow the use of isotope mixing models to determine source contribution. NOx and NO2 passive air samplers will be deployed at three City of Corpus Christi NOx and ozone monitoring stations each month for one year and the nitrogen and oxygen isotopic composition ( 15N, 18O) of each sample will be measured. The 15N-NOx value in ambient air, and the 15N-NOx values of the NOx sources, will be applied to a Bayesian isotope mixing model to quantify source contributions. Limited preliminary data suggests that vehicular emissions is the main contribution, followed by industrial emissions, then biogenic. Results will help aid in the creation of an ozone action plan for the City of Corpus Christi.en_US
dc.identifier.urihttps://hdl.handle.net/1969.6/92000
dc.language.isoen_USen_US
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectair qualityen_US
dc.subjectair pollutionen_US
dc.subjectemissionen_US
dc.subjectatmospheric chemistryen_US
dc.subjectairsheden_US
dc.subjectphotochemicalen_US
dc.titleNOx source apportionment in a coastal urban air shed using stable isotope techniquesen_US
dc.typePresentationen_US

Files

Original bundle

Now showing 1 - 1 of 1
No Thumbnail Available
Name:
SRSS presentation_CORRECT_Kaiya Shealy.pptx
Size:
36.06 MB
Format:
Microsoft Powerpoint XML
Description:
Presentation
Download

License bundle

Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.72 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

2022 Spring Student Research Symposium Oral Presentation Materials