ASDC | SONEX_Merge_DC8_Data

SONEX Level 3

Entry Title: SASS (Subsonics Assessment) Ozone and NOx Experiment (SONEX) Merge Data Files

Entry ID: SONEX_Merge_DC8_Data_1

Aerosols

Description

SONEX_Merge_DC8_Data_1 is all of the project generated merge files for the SONEX suborbital campaign. Types of merges include 1- and 5-minute, aerosol composition-based, H2O2-based, HNO3-based, hydrocarbon-based, NO-based, and PAN-based merges. Data collection for this product 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_Merge_DC8_Data_1

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GENERAL DOCUMENTATION

Ames File Format

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:

SURFACE PRESSURE
AIR TEMPERATURE > SURFACE TEMPERATURE
FLIGHT DATA LOGS
SULFATE > SULFUR COMPOUNDS
ATMOSPHERIC PRESSURE MEASUREMENTS
AEROSOLS
VOLATILE ORGANIC COMPOUNDS
NITROGEN OXIDES > NITROGEN COMPOUNDS
AMMONIUM AEROSOLS
WIND SPEED > UPPER LEVEL WINDS
STATIC PRESSURE
WIND DIRECTION > UPPER LEVEL WINDS
PHOTOLYSIS RATES > PHOTOCHEMISTRY
WIND PROFILES
WIND DIRECTION PROFILES > WIND PROFILES
U/V WIND COMPONENTS > SURFACE WINDS
ATMOSPHERIC CARBON MONOXIDE > CARBON AND HYDROCARBON COMPOUNDS
WIND DIRECTION > SURFACE WINDS
POTENTIAL VORTICITY > VORTICITY > WIND DYNAMICS
WIND SPEED > SURFACE WINDS
POTENTIAL TEMPERATURE > SURFACE TEMPERATURE
U/V WIND COMPONENTS > UPPER LEVEL WINDS
ATMOSPHERIC CARBON DIOXIDE > CARBON AND HYDROCARBON COMPOUNDS
STATIC TEMPERATURE > SURFACE TEMPERATURE

Data Distribution

File Format(s):

Ames

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Spatial Information

Spatial Coverage: (S: 19.89, N: 84.32), (W: -178.2, E: 148.2)
Spatial Coverage Type: Horizontal Vertical
Coordinate System: Cartesian
Granule Spatial Representation: Cartesian

Locations

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

Temporal Information

Temporal Coverage: 1997-10-07 - 1997-11-12

Platforms

Jet

NASA DC-8

NASA Douglas DC-8

DADS

DC-8 DATA ACQUISITION AND DISTRIBUTION SYSTEM

MMS

Meteorological Measurement System

MTP

Microwave Temperature Profiler

CNC

Condensation Nuclei Counter

TSI CNC-3760

TSI Model 3760 Condensation Nuclei Counter

WAS

Whole Air Sampler

ATHOS

Airborne Tropospheric Hydroxides Sensor

CHEMILUMINESCENCE

FSSP

Forward Scattering Spectrometer Probe

PCASP

Passive-Cavity Aerosol Spectrometer Probe

DACOM

Differential Absorption CO, CH4, N2O Measurements

LICOR GAS EXCHANGE SYSTEM

DLH

Diode Laser Hygrometer developed by NASA LaRC

SAFS

Scanning Actinic Flux Spectroradiometer

CIMS

Chemical Ionization Mass Spectrometer

Metadata Dates

Created on 2023-04-21

Last updated on 2023-09-26