ASDC | SONEX_jValue_AircraftInSitu_DC8_Data

SONEX Level 2

Entry Title: SASS (Subsonics Assessment) Ozone and NOx Experiment (SONEX) Photolysis Frequencies (J-Values)

Entry ID: SONEX_jValue_AircraftInSitu_DC8_Data_1

Field Campaigns

Description

SONEX_jValue_AircraftInSitu_DC8_Data_1 is the photolysis frequencies (j-values) measured along the DC-8 flight by the Scanning Actinic Flux Spectroradiometers (SAFS). Data collection is complete.

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.

DOI

10.5067/ASDC/SUBORBITAL/SONEX_jValue_AircraftInSitu_DC8_Data_1

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GENERAL DOCUMENTATION

Ames File Format Overview

PUBLICATIONS

A meteorological overview of the Subsonic Assessment Ozone and Nitrogen Oxide Experiment (SONEX) period

Composition and distribution of aerosols over the North Atlantic during the Subsonic Assessment Ozone and Nitrogen Oxide Experiment (SONEX)

Evidence of convection as a major source of condensation nuclei in the northern midlatitude upper troposphere

Impact of aircraft emissions on reactive nitrogen over the North Atlantic Flight Corridor region

Measurements of nitrogen oxides at the tropopause: Attribution to convection and correlation with lightning

Model calculations of the impact of NOx from air traffic, lightning, and surface emissions, compared with measurements

Nonmethane hydrocarbon measurements in the North Atlantic Flight Corridor during the Subsonic Assessment Ozone and Nitrogen Oxide Experiment

Observations of convective and dynamical instabilities in tropopause folds and their contribution to stratosphere-troposphere exchange

Perspectives on NO, NOy, and fine aerosol sources and variability during SONEX

Reactive nitrogen budget during the NASA SONEX Mission

SONEX airborne mission and coordinated POLINAT-2 activity: Overview and accomplishments

From GCMD Science Keywords:

PHOTOLYSIS RATES > PHOTOCHEMISTRY

Data Distribution

File Format(s):

Ames

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Spatial Information

Spatial Coverage: (S: 19.89, N: 69.127), (W: -129.403, E: 13.023)
Spatial Coverage Type: Horizontal Vertical
Coordinate System: Cartesian
Granule Spatial Representation: Cartesian

Locations

NORTHERN HEMISPHERE WESTERN HEMISPHERE NORTH ATLANTIC OCEAN ATLANTIC OCEAN MAINE AZORES IRELAND

Temporal Information

Temporal Coverage: 1997-10-07 - 1997-11-13

Platforms

Jet

NASA DC-8

NASA Douglas DC-8

SAFS

Scanning Actinic Flux Spectroradiometer

Metadata Dates

Created on 2023-04-21

Last updated on 2023-09-26