Effect of aerosols and NO 2 concentration on ultraviolet actinic flux near Mexico City during MILAGRO: measurements and model calculations
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Abstract
Abstract. Urban air pollution absorbs and scatters solar ultraviolet (UV) radiation, and thus has a potentially large effect on tropospheric photochemical rates. We present the first detailed comparison between actinic fluxes (AF) in the wavelength range 330–420 nm measured in highly polluted conditions and simulated with the Tropospheric Ultraviolet-Visible (TUV) model. Measurements were made during the MILAGRO campaign near Mexico City in March 2006, at a ground-based station near Mexico City (the T1 supersite) and from the NSF/NCAR C-130 aircraft. At the surface, measured AF values are typically smaller than the model by up to 25% in the morning, 10% at noon, and 40% in the afternoon, for pollution-free and cloud-free conditions. When measurements of PBL height, NO2 concentration and aerosols optical properties are included in the model, the agreement improves to within ±10% in the morning and afternoon, and ±3% at noon. Based on daily averages, aerosols account for 68% and NO2 for 25% of AF reductions observed at the surface. Several overpasses from the C-130 aircraft provided the opportunity to examine the AF perturbations aloft, and also show better agreement with the model when aerosol and NO2 effects are included above and below the flight altitude. TUV model simulations show that the vertical structure of the actinic flux is sensitive to the choice of the aerosol single scattering albedo (SSA) at UV wavelengths. Typically, aerosols enhance AF above the PBL and reduce AF near the surface. However, for highly scattering aerosols (SSA > 0.95), enhancements can penetrate well into the PBL, while for strongly absorbing aerosols (SSA < 0.6) reductions in AF are computed in the free troposphere as well as in the PBL. Additional measurements of the SSA at these wavelengths are needed to better constrain the effect of aerosols on the vertical structure of the AF.
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In CESM2(WACCM6), photolysis rates are calculated using lookup tables that account for the overhead ozone column and clouds but exclude the effects of aerosols, thereby reducing the effect SAI aerosols could have on tropospheric photochemistry and ozone.
“in CESM2(WACCM6) photolysis rates are calculated using lookup tables, taking into account the overhead ozone column and clouds but excluding the effects of aerosols, thereby reducing the effect SAI aerosols could have on tropospheric photochemistry and ozone.”
From Air quality impacts of stratospheric aerosol injections are likely small and mainly driven by changes in climate, not aerosol settling (2026) · cites this paper as Palancar et al., 2013
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Brem, B. T. (2012) · Illinois Digital Environment for Access to Learning and Scholarship (University of Illinois at Urbana-Champaign)
- Authors
- Palancar, G. G., Lefer, B. L., Hall, S. R., Shaw, W. J., Corr, C. A., Herndon, S. C., Slusser, J. R., & Madronich, S.
- Affiliations
- NSF National Center for Atmospheric Research (US)
- University of Houston (US)
- Pacific Northwest National Laboratory (US)
- University of New Hampshire (US)
- Aerodyne Research (US)
- Colorado State University (US)
- Venue
- Atmospheric Chemistry and Physics
- Publisher
- Copernicus GmbH
- Published
- 2013-01-24
- Volume
- 13
- Issue
- 2
- Pages
- 1011-1022
- ISSN
- 1680-7316 (ISSN-L)
- 1680-7324
- OpenAlex
- W1977567291
- Cited by
- 23
- References
- 56
- Citations by year
- 2026: 1 · 2024: 1 · 2021: 5 · 2020: 1 · 2019: 2 · 2018: 5 · 2017: 1 · 2015: 2 · 2014: 2 · 2013: 1 · 2012: 1
- FWCI
- 1.09
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- Atmospheric chemistry and physics (publishedVersion, cc-by)
- Americanae (AECID Library) (submittedVersion, cc-by-nc-sa)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- LA Referencia (Red Federada de Repositorios Institucionales de Publicaciones Científicas) (submittedVersion, cc-by-nc-sa)
- Funders
- National Science Foundation (0511911)
- U.S. Department of Agriculture
- National Center for Atmospheric Research
- Consejo Nacional de Investigaciones Científicas y Técnicas
- Cooperative State Research, Education, and Extension Service
- Topics
- Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Atmospheric chemistry and aerosols
- Physical Sciences › Environmental Science › Global and Planetary Change › Atmospheric aerosols and clouds
- Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Atmospheric Ozone and Climate
- Keywords
- actinic flux, nitrogen dioxide, urban air pollution, tropospheric photochemistry, single scattering albedo, boundary layer height, TUV model, Mexico City, MILAGRO campaign, airborne measurements, aerosol optical properties
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