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Estimating vehicle carbon dioxide emissions from Boulder, Colorado, using horizontal path-integrated column measurements
We performed 7.5 weeks of path-integrated concentration measurements of CO(2), CH(4), H(2)O, and HDO over the city of Boulder, Colorado. An open-path dual-comb spectrometer simultaneously measured time-resolved data across a reference path, located near the mountains to the west of the city, and acr...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6759866/ https://www.ncbi.nlm.nih.gov/pubmed/31555337 http://dx.doi.org/10.5194/acp-19-4177-2019 |
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author | Waxman, Eleanor M. Cossel, Kevin C. Giorgetta, Fabrizio Truong, Gar-Wing Swann, William C. Coddington, Ian Newbury, Nathan R. |
author_facet | Waxman, Eleanor M. Cossel, Kevin C. Giorgetta, Fabrizio Truong, Gar-Wing Swann, William C. Coddington, Ian Newbury, Nathan R. |
author_sort | Waxman, Eleanor M. |
collection | PubMed |
description | We performed 7.5 weeks of path-integrated concentration measurements of CO(2), CH(4), H(2)O, and HDO over the city of Boulder, Colorado. An open-path dual-comb spectrometer simultaneously measured time-resolved data across a reference path, located near the mountains to the west of the city, and across an over-city path that intersected two-thirds of the city, including two major commuter arteries. By comparing the measured concentrations over the two paths when the wind is primarily out of the west, we observe daytime CO(2) enhancements over the city. Given the warm weather and the measurement footprint, the dominant contribution to the CO(2) enhancement is from city vehicle traffic. We use a Gaussian plume model combined with reported city traffic patterns to estimate city emissions of on-road CO(2) as (6.2 ± 2.2) × 10(5) metric tons (t) CO(2) yr(−1) after correcting for non-traffic sources. Within the uncertainty, this value agrees with the city’s bottom-up greenhouse gas inventory for the on-road vehicle sector of 4.5 × 10(5) t CO(2) yr(−1). Finally, we discuss experimental modifications that could lead to improved estimates from our path-integrated measurements. |
format | Online Article Text |
id | pubmed-6759866 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
record_format | MEDLINE/PubMed |
spelling | pubmed-67598662019-09-25 Estimating vehicle carbon dioxide emissions from Boulder, Colorado, using horizontal path-integrated column measurements Waxman, Eleanor M. Cossel, Kevin C. Giorgetta, Fabrizio Truong, Gar-Wing Swann, William C. Coddington, Ian Newbury, Nathan R. Atmos Chem Phys Article We performed 7.5 weeks of path-integrated concentration measurements of CO(2), CH(4), H(2)O, and HDO over the city of Boulder, Colorado. An open-path dual-comb spectrometer simultaneously measured time-resolved data across a reference path, located near the mountains to the west of the city, and across an over-city path that intersected two-thirds of the city, including two major commuter arteries. By comparing the measured concentrations over the two paths when the wind is primarily out of the west, we observe daytime CO(2) enhancements over the city. Given the warm weather and the measurement footprint, the dominant contribution to the CO(2) enhancement is from city vehicle traffic. We use a Gaussian plume model combined with reported city traffic patterns to estimate city emissions of on-road CO(2) as (6.2 ± 2.2) × 10(5) metric tons (t) CO(2) yr(−1) after correcting for non-traffic sources. Within the uncertainty, this value agrees with the city’s bottom-up greenhouse gas inventory for the on-road vehicle sector of 4.5 × 10(5) t CO(2) yr(−1). Finally, we discuss experimental modifications that could lead to improved estimates from our path-integrated measurements. 2019 /pmc/articles/PMC6759866/ /pubmed/31555337 http://dx.doi.org/10.5194/acp-19-4177-2019 Text en http://creativecommons.org/licenses/by/4.0/ This work is distributed under the Creative Commons Attribution 4.0 License. |
spellingShingle | Article Waxman, Eleanor M. Cossel, Kevin C. Giorgetta, Fabrizio Truong, Gar-Wing Swann, William C. Coddington, Ian Newbury, Nathan R. Estimating vehicle carbon dioxide emissions from Boulder, Colorado, using horizontal path-integrated column measurements |
title | Estimating vehicle carbon dioxide emissions from Boulder, Colorado, using horizontal path-integrated column measurements |
title_full | Estimating vehicle carbon dioxide emissions from Boulder, Colorado, using horizontal path-integrated column measurements |
title_fullStr | Estimating vehicle carbon dioxide emissions from Boulder, Colorado, using horizontal path-integrated column measurements |
title_full_unstemmed | Estimating vehicle carbon dioxide emissions from Boulder, Colorado, using horizontal path-integrated column measurements |
title_short | Estimating vehicle carbon dioxide emissions from Boulder, Colorado, using horizontal path-integrated column measurements |
title_sort | estimating vehicle carbon dioxide emissions from boulder, colorado, using horizontal path-integrated column measurements |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6759866/ https://www.ncbi.nlm.nih.gov/pubmed/31555337 http://dx.doi.org/10.5194/acp-19-4177-2019 |
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