An intercomparison of satellite, airborne, and ground-level observations with WRF–CAMx simulations of NO<sub>2</sub> columns over Houston, Texas, during the September 2021 TRACER-AQ campaign

Nawaz, M. Omar; Johnson, Jeremiah; Yarwood, Greg; de Foy, Benjamin; Judd, Laura; Goldberg, Daniel L.

doi:https://doi.org/10.5194/acp-24-6719-2024

Articles | Volume 24, issue 11

https://doi.org/10.5194/acp-24-6719-2024

© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/acp-24-6719-2024

© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 24, issue 11

Research article

|

10 Jun 2024

Research article |

| 10 Jun 2024

An intercomparison of satellite, airborne, and ground-level observations with WRF–CAMx simulations of NO₂ columns over Houston, Texas, during the September 2021 TRACER-AQ campaign

M. Omar Nawaz, Jeremiah Johnson, Greg Yarwood, Benjamin de Foy, Laura Judd, and Daniel L. Goldberg

Supplement

https://doi.org/10.5194/acp-24-6719-2024-supplement

Data sets

Description of the NASA GEOS Composition Forecast Modeling System GEOS-CF v1.0 (https://opendap.nccs.nasa.gov/dods/) Christoph A. Keller et al. https://doi.org/10.1029/2020MS002413

TROPOMI Level 2 Nitrogen Dioxide total column products, Version 2.3.1 Copernicus Sentinel-5P (processed by ESA) https://doi.org/10.5270/S5P-9bnp8q8

TRACER-AQ JSC G-V Aircraft Remotely Sensed GEOstationary Coastal and Air Pollution Events (GEO-CAPE) Airborne Simulator (GCAS) Data NASA/LARC/SD/ASDC https://doi.org/10.5067/ASDC/SUBORBITAL/TRACERAQ/DATA001/GV/AircraftRemoteSensing/GCAS_1

TRACER-AQ Pandora Column Observations NASA/LARC/SD/ASDC https://doi.org/10.5067/ASDC/SUBORBITAL/TRACERAQDATA001/Ground/Pandora_1

NOAA Monthly U.S. Climate Divisional Database (NClimDiv) Russell S. Vose et al. https://doi.org/10.7289/V5M32STR

US EPA Air Quality System (AQS) US Environmental Protection Agency https://aqs.epa.gov/aqsweb/airdata/download_files.html

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Short summary

NO₂ is a gas with implications for air pollution. A campaign conducted in Houston provided an opportunity to compare NO₂ from different instruments and a model. Aircraft and satellite observations agreed well with measurements on the ground; however, the latter estimated lower values. We find that model-simulated NO₂ was lower than observations, especially downtown, suggesting that NO₂ sources associated with the urban core of Houston, such as vehicle emissions, may be underestimated.

An intercomparison of satellite, airborne, and ground-level observations with WRF–CAMx simulations of NO2 columns over Houston, Texas, during the September 2021 TRACER-AQ campaign

Supplement

Data sets

An intercomparison of satellite, airborne, and ground-level observations with WRF–CAMx simulations of NO₂ columns over Houston, Texas, during the September 2021 TRACER-AQ campaign