New Insights Into the Role of Atmospheric Transport and Mixing on Column and Surface Concentrations of NO<sub>2</sub> at a Coastal Urban Site

Adams, Taylor J.; Geddes, Jeffrey A.; Spinei, E.

doi:10.1029/2022jd038237

Cited by 3 publications

(2 citation statements)

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“…Direct-sun NO 2 columns produced by Pandora have a clear sky nominal accuracy of 0.1 DU in the vertical column (Herman et al, 2009). The separation of stratospheric and tropospheric columns from the Pandora total column measurement is described in detail elsewhere (Adams et al, 2023). Briefly, an 8-day moving average of GEOS-CF stratospheric NO 2 diurnal variability is scaled with TROPOMI-derived stratospheric NO 2 at its overpass time.…”

Section: Pandoramentioning

confidence: 99%

“…Compared to surface NO 2 , we conclude that temporal variability in the tropospheric column NO 2 serves as a better indicator of sea breeze front arrival. Detailed examination of the meteorological controls on the relationship between surface concentrations and column abundance at our location is presented in a companion observational analysis (Adams et al, 2023).…”

Section: Variability In Tropospheric Nomentioning

confidence: 99%

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Implications of Sea Breezes on Air Quality Monitoring in a Coastal Urban Environment: Evidence From High Resolution Modeling of NO₂ and O₃

et al. 2023

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Coastal urban environments face unique challenges associated with air quality‐meteorology interactions. In this study, high resolution chemical transport modeling over the Greater Boston area was performed to improve our understanding of sea breezes impacts on the spatiotemporal variability of primary and secondary pollutants. We perform WRF‐Chem simulations at 3 km resolution over June 22 to 10 July 2019 (a period that included 10 sea breeze occurrences), and use Pandora tropospheric NO2 column, surface air quality monitoring, and vertical meteorological aircraft profiles for evaluation. The model generally reproduces observed spatiotemporal variability of air pollution during sea breezes well. Tropospheric columns of NO2 predicted by the model and observed by the Pandora instrument show that sea breezes are associated with rapid increases and steep gradients in tropospheric NO2 and confirm accumulation of local primary emissions. Spatial heterogeneity in tropospheric NO2 is strongly governed by inland penetration lengths of the sea breeze front. Process diagnostics show that three sea‐breeze days where O3 observations recorded hourly concentrations >70 ppb have both efficient net chemical O3 production in the boundary layer (>10 ppb/hr) and rapid O3 convergence in the near‐surface convergence zone (>20 ppb/hr). During sea breezes, interactions between photochemistry, the convergence zone inland penetration, and urban NOx titration effects, contribute to strong heterogeneity and high O3 inland that is not captured by the current monitoring network. We discuss monitoring needs and model applications for the sea breeze scenarios, with broad implications for air quality monitoring in coastal urban environments.

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Section: Pandoramentioning

confidence: 99%

Section: Variability In Tropospheric Nomentioning

confidence: 99%

Implications of Sea Breezes on Air Quality Monitoring in a Coastal Urban Environment: Evidence From High Resolution Modeling of NO₂ and O₃

et al. 2023

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Informing Near-Airport Satellite NO₂ Retrievals Using Pandora Sky-Scanning Observations

Mouat,

Spinei,

Kaiser

2024

ACS EST Air

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Airports are a large and growing source of NO x . Tracking airport-related emissions is especially difficult, as a portion of emissions are elevated above the surface. While satellite-based NO 2 observations show hot-spots near airports, near-source retrievals often have large biases related to uncertainties in the NO 2 vertical distribution and resultant air mass factors (AMF). Here we use observations from UV−vis spectrometers (Pandora 1S, SciGlob) deployed near the Atlanta Hartsfield-Jackson International airport from April 2020−May 2021 to assess the impact of aviation on NO 2 vertical profiles. We show the first near-airport sky-scanning Pandora observations, which are used to distinguish the airport plume from the urban background. We find that increasing aviation leads to higher NO 2 over the airport, and the enhancement is distributed across the mixed layer near-equally. We compare observed profiles with those modeled by the Goddard Earth Observing System composition forecast (GEOS-CF) system. We find that modeled profiles attribute a larger portion of the column closer to the surface and underestimate the NO 2 mixing height. Observed profiles typically exhibited greater NO 2 concentrations up to 2.5 km above ground level. Air mass factors (AMF) calculated using observations (AMF Fused ) are similar over Hartsfield-Jackson to those calculated using GEOS-CF (AMF GEOS-CF ). The unexpected similarity in alternative AMFs is attributed to the altitude-dependent sensitivity of AMF Fused to changes in NO 2 concentration. Using either AMF Fused or AMF GEOS-CF to evaluate TROPOMI NO 2 against independent direct-sun observations produces consistent normalized mean differences of −22% and −29%, respectively. Overall, these results demonstrate the benefits of a combined ground and satellite-based approach for probing a complex distribution of NO x emissions in an urban area.

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No2 Data from Air Quality Networks and Sentinel-5p: Relationship with O3 and Meteorological Variables in the Largest Cities Of Spain

Morillas,

Álvarez,

Pires

et al. 2024

Preprint

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New Insights Into the Role of Atmospheric Transport and Mixing on Column and Surface Concentrations of NO₂ at a Coastal Urban Site

Cited by 3 publications

References 129 publications

Implications of Sea Breezes on Air Quality Monitoring in a Coastal Urban Environment: Evidence From High Resolution Modeling of NO₂ and O₃

Implications of Sea Breezes on Air Quality Monitoring in a Coastal Urban Environment: Evidence From High Resolution Modeling of NO₂ and O₃

Informing Near-Airport Satellite NO₂ Retrievals Using Pandora Sky-Scanning Observations

No2 Data from Air Quality Networks and Sentinel-5p: Relationship with O3 and Meteorological Variables in the Largest Cities Of Spain

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New Insights Into the Role of Atmospheric Transport and Mixing on Column and Surface Concentrations of NO2 at a Coastal Urban Site

Cited by 3 publications

References 129 publications

Implications of Sea Breezes on Air Quality Monitoring in a Coastal Urban Environment: Evidence From High Resolution Modeling of NO2 and O3

Implications of Sea Breezes on Air Quality Monitoring in a Coastal Urban Environment: Evidence From High Resolution Modeling of NO2 and O3

Informing Near-Airport Satellite NO2 Retrievals Using Pandora Sky-Scanning Observations

No2 Data from Air Quality Networks and Sentinel-5p: Relationship with O3 and Meteorological Variables in the Largest Cities Of Spain

Contact Info

Product

Resources

About

New Insights Into the Role of Atmospheric Transport and Mixing on Column and Surface Concentrations of NO₂ at a Coastal Urban Site

Implications of Sea Breezes on Air Quality Monitoring in a Coastal Urban Environment: Evidence From High Resolution Modeling of NO₂ and O₃

Implications of Sea Breezes on Air Quality Monitoring in a Coastal Urban Environment: Evidence From High Resolution Modeling of NO₂ and O₃

Informing Near-Airport Satellite NO₂ Retrievals Using Pandora Sky-Scanning Observations