SASS (Subsonics Assessment) Ozone and NOx Experiment (SONEX) Model Data

Description

SONEX_Model_Data_1 contains all of the model data used for the SONEX suborbital campaign. This data product contains: CO from surface emissions at 6 km, NOx from aircraft emission at 6 km, NOx from lightning at 6 km, and NOx from surface pollution at 6 km. The SASS (Subsonics Assessment) Ozone and NOx Experiment (SONEX) was an international, multi-organizational mission that took place in October-November 1997. NASA was the US sponsor of SONEX that partnered with POLINAT-2 (Pollution from Aircraft Emissions in the North Atlantic Flight Corridor) funded by the German DLR (Deutsches Zentrum für Luft- und Raumfahrt) or German Aerospace Agency. NASA flew the DC-8 aircraft out of NASA/Ames Research Center. DLR operated an instrumented Falcon 20 aircraft. The staging locations for NAFC sampling were primarily Bangor, Maine (US), and Shannon, Ireland. Subsonic aircraft emissions impact several aspects of atmospheric composition: nitrogen oxides (NOx), CO, and hydrocarbons from emissions can perturb upper tropospheric/lower stratospheric (UT/LS) ozone; water vapor, soot, and sulfur oxides (SOx) emitted by aircraft may perturb clouds and aerosols, changing UT/LS radiative forcing and global temperature. In SONEX and POLINAT, flights were conducted in the vicinity of the North Atlantic Flight Coordinator (NAFC) to observe the impact of aircraft emissions on NOx and ozone (O3). The DC-8 aircraft payload (Singh et al., 1999) primarily measured in-situ CO, CO2, hydrocarbons/halocarbons, O3, aerosols (Dibb et al., 2000), OH/HO2, water vapor, nitric acid (Talbot et al., 1999), photolysis rates, temperature, pressure, winds, NOx, and NOy. Three sampling approaches were implemented during SONEX. First, special meteorological (Fuelberg et al., 2000) were developed to allow targeted sampling for air parcels affected by aircraft emissions and various meteorological events, e.g., convection, lightning (Jeker et al., 2000), stratospheric intrusions (Cho et al., 2000). Second, because the NAFC had not been extensively sampled in the past, it was important for SONEX to characterize the climatology of trace species like CN (Wang et al., 2000), NOx and NOy (Koike et al., 2000). Third, tracers (Simpson et al., 2000; Thompson et al., 1999) and model sensitivity studies (Meijer et al., 2000) were employed for Air Mass Identification. This sampling strategy answered the following questions: Where and when are air masses found with the greatest aircraft influence? When and where was stratospheric air sampled? SONEX showed a substantial impact of aircraft emissions on UT/LS NOx and CN in the vicinity of fresh aircraft emissions. However, during October-November 1997 over the NAFC, UT/LS NOx was dominated by surface emissions redistributed by convection and augmented by lightning.

Resources

Name Format Description Link
21 Reactive nitrogen budget during the NASA SONEX Mission https://doi.org/10.1029/1999GL900589
21 How to Cite ASDC Data https://asdc.larc.nasa.gov/citing-data
21 SONEX airborne mission and coordinated POLINAT-2 activity: Overview and accomplishments https://doi.org/10.1029/1999GL900588
21 Composition and distribution of aerosols over the North Atlantic during the Subsonic Assessment Ozone and Nitrogen Oxide Experiment (SONEX) https://doi.org/10.1029/1999JD900424
21 A meteorological overview of the Subsonic Assessment Ozone and Nitrogen Oxide Experiment (SONEX) period https://doi.org/10.1029/1999JD900917
21 Evidence of convection as a major source of condensation nuclei in the northern midlatitude upper troposphere https://doi.org/10.1029/1999GL010930
21 Nonmethane hydrocarbon measurements in the North Atlantic Flight Corridor during the Subsonic Assessment Ozone and Nitrogen Oxide Experiment https://doi.org/10.1029/1999JD900750
21 Perspectives on NO, NOy, and fine aerosol sources and variability during SONEX https://doi.org/10.1029/1999GL900581
21 Model calculations of the impact of NOx from air traffic, lightning, and surface emissions, compared with measurements https://doi.org/10.1029/1999JD901052
21 Earthdata Search client for SONEX_Model_Data_1 https://search.earthdata.nasa.gov/search/granules?p=C2662402759-LARC_ASDC
21 ASDC Direct Data Download for SONEX_Model_Data_1 https://asdc.larc.nasa.gov/data/SONEX/Model_Data_1/
21 Impact of aircraft emissions on reactive nitrogen over the North Atlantic Flight Corridor region https://doi.org/10.1029/1999JD901013
21 DOI for SONEX_Model_Data_1 https://doi.org/10.5067/ASDC/SUBORBITAL/SONEX_Model_Data_1
21 Measurements of nitrogen oxides at the tropopause: Attribution to convection and correlation with lightning https://doi.org/10.1029/1999JD901053
21 Observations of convective and dynamical instabilities in tropopause folds and their contribution to stratosphere-troposphere exchange https://doi.org/10.1029/1999JD900430
21 Ames File Format Overview https://espo.nasa.gov/content/Ames_Format_Overview

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  • atmosphere
  • atmospheric-chemistry
  • air-quality
  • earth-science

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