Measurement report: Spatiotemporal variability of peroxy acyl nitrates (PANs) over Mexico City from TES and CrIS satellite measurements
<p>Peroxy acyl nitrates (PANs) are photochemical pollutants with implications for health and atmospheric oxidation capacity. PANs are formed via the oxidation of non-methane volatile organic compounds (NMVOCs) in the presence of nitrogen oxide radicals (NO<span class="inline-formula&qu...
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2023-02-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | https://acp.copernicus.org/articles/23/2667/2023/acp-23-2667-2023.pdf |
| _version_ | 1797894250337140736 |
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| author | M. J. Shogrin V. H. Payne S. S. Kulawik K. Miyazaki E. V. Fischer |
| author_facet | M. J. Shogrin V. H. Payne S. S. Kulawik K. Miyazaki E. V. Fischer |
| author_sort | M. J. Shogrin |
| collection | DOAJ |
| description | <p>Peroxy acyl nitrates (PANs) are photochemical pollutants with
implications for health and atmospheric oxidation capacity. PANs are formed
via the oxidation of non-methane volatile organic compounds (NMVOCs) in the
presence of nitrogen oxide radicals (NO<span class="inline-formula"><sub><i>x</i></sub></span> <span class="inline-formula">=</span> NO <span class="inline-formula">+</span> NO<span class="inline-formula"><sub>2</sub></span>). While
urban environments are large sources of PANs, in situ observations in urban
areas are limited. Here we use satellite measurements of PANs from the
Tropospheric Emission Spectrometer (TES) and the Suomi National
Polar-orbiting Partnership (S-NPP) Cross-track Infrared Sounder (CrIS) to
evaluate the spatiotemporal variability of PANs over and around Mexico City.
Monthly mean maxima in PANs over the Mexico City Metropolitan Area (MCMA)
occur during spring months (March–May). This time of year coincides with a
peak in local photochemistry and more frequent air stagnation. Local fire
activity also typically peaks between February and May, which leads to
strong interannual variability of PANs over the MCMA. We use S-NPP CrIS data
to probe the spatial outflow pattern of PANs produced within urban Mexico
City during the month with the largest mixing ratios of PANs (April). Peak
outflow in April occurs to the northeast of the city and over the mountains
south of the city. Outflow to the northwest appears infrequently. Using
observations during 2018 versus 2019, we also show that PANs were not
significantly reduced during a year, with a significant decrease in NO<span class="inline-formula"><sub><i>x</i></sub></span>
over Mexico City. Our analysis demonstrates that the space-based
observations provided by CrIS and TES can increase understanding of the
spatiotemporal variability of PANs over and surrounding Mexico City.</p> |
| first_indexed | 2024-04-10T07:06:00Z |
| format | Article |
| id | doaj.art-4104173f3b774b7da323ee25c3b97fd5 |
| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-04-10T07:06:00Z |
| publishDate | 2023-02-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-4104173f3b774b7da323ee25c3b97fd52023-02-27T07:29:47ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242023-02-01232667268210.5194/acp-23-2667-2023Measurement report: Spatiotemporal variability of peroxy acyl nitrates (PANs) over Mexico City from TES and CrIS satellite measurementsM. J. Shogrin0V. H. Payne1S. S. Kulawik2K. Miyazaki3E. V. Fischer4Department of Atmospheric Science, Colorado State University, Fort Collins, CO, USAJet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USABay Area Environmental Research Institute, Petaluma, CA, USAJet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USADepartment of Atmospheric Science, Colorado State University, Fort Collins, CO, USA<p>Peroxy acyl nitrates (PANs) are photochemical pollutants with implications for health and atmospheric oxidation capacity. PANs are formed via the oxidation of non-methane volatile organic compounds (NMVOCs) in the presence of nitrogen oxide radicals (NO<span class="inline-formula"><sub><i>x</i></sub></span> <span class="inline-formula">=</span> NO <span class="inline-formula">+</span> NO<span class="inline-formula"><sub>2</sub></span>). While urban environments are large sources of PANs, in situ observations in urban areas are limited. Here we use satellite measurements of PANs from the Tropospheric Emission Spectrometer (TES) and the Suomi National Polar-orbiting Partnership (S-NPP) Cross-track Infrared Sounder (CrIS) to evaluate the spatiotemporal variability of PANs over and around Mexico City. Monthly mean maxima in PANs over the Mexico City Metropolitan Area (MCMA) occur during spring months (March–May). This time of year coincides with a peak in local photochemistry and more frequent air stagnation. Local fire activity also typically peaks between February and May, which leads to strong interannual variability of PANs over the MCMA. We use S-NPP CrIS data to probe the spatial outflow pattern of PANs produced within urban Mexico City during the month with the largest mixing ratios of PANs (April). Peak outflow in April occurs to the northeast of the city and over the mountains south of the city. Outflow to the northwest appears infrequently. Using observations during 2018 versus 2019, we also show that PANs were not significantly reduced during a year, with a significant decrease in NO<span class="inline-formula"><sub><i>x</i></sub></span> over Mexico City. Our analysis demonstrates that the space-based observations provided by CrIS and TES can increase understanding of the spatiotemporal variability of PANs over and surrounding Mexico City.</p>https://acp.copernicus.org/articles/23/2667/2023/acp-23-2667-2023.pdf |
| spellingShingle | M. J. Shogrin V. H. Payne S. S. Kulawik K. Miyazaki E. V. Fischer Measurement report: Spatiotemporal variability of peroxy acyl nitrates (PANs) over Mexico City from TES and CrIS satellite measurements Atmospheric Chemistry and Physics |
| title | Measurement report: Spatiotemporal variability of peroxy acyl nitrates (PANs) over Mexico City from TES and CrIS satellite measurements |
| title_full | Measurement report: Spatiotemporal variability of peroxy acyl nitrates (PANs) over Mexico City from TES and CrIS satellite measurements |
| title_fullStr | Measurement report: Spatiotemporal variability of peroxy acyl nitrates (PANs) over Mexico City from TES and CrIS satellite measurements |
| title_full_unstemmed | Measurement report: Spatiotemporal variability of peroxy acyl nitrates (PANs) over Mexico City from TES and CrIS satellite measurements |
| title_short | Measurement report: Spatiotemporal variability of peroxy acyl nitrates (PANs) over Mexico City from TES and CrIS satellite measurements |
| title_sort | measurement report spatiotemporal variability of peroxy acyl nitrates pans over mexico city from tes and cris satellite measurements |
| url | https://acp.copernicus.org/articles/23/2667/2023/acp-23-2667-2023.pdf |
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