Skip to main content
ORNL DAAC HomeNASA Home

DAAC Home > Get Data > NASA Projects > Atmospheric Tomography Mission (ATom) > Landing page

ATom: L2 Trace Gas and Isotope Measurements from Medusa Whole Air Sampler, Version 2

Overview

DOIhttps://doi.org/10.3334/ORNLDAAC/1881
Version2
Project
Published2021-05-24
Updated2021-05-24
Usage11 downloads

Description

This dataset provides O2/N2, CO2, Ar/N2, and stable isotope ratios of CO2 measured in flasks collected by the Medusa Whole Air Sampler during airborne campaigns conducted by NASA's Atmospheric Tomography (ATom) mission. ATom deployed an extensive gas and aerosol payload on the NASA DC-8 aircraft for a systematic, global-scale sampling of the atmosphere, profiling continuously from 0.2 to 12 km altitude. Flights occurred in each of 4 seasons from 2016 to 2018. Medusa collected 32 cryogenically dried, flow, and pressure-controlled samples per flight. The samples are collected by an automated sampler into 1.5 L glass flasks that integrate over 25 seconds. Medusa provides discretely-sampled comparisons for onboard in situ O2/N2 ratio and CO2 measurements and unique measurements of Ar/N2 and 13C, 14C, and 18O isotopologues of CO2. Medusa flasks are analyzed on a sector-magnet mass spectrometer and a LiCor non-dispersive infrared CO2 analyzer by the Scripps O2 Program at Scripps Institution of Oceanography.

Science Keywords

  • ATMOSPHERE
  • ATMOSPHERIC CHEMISTRY
  • CARBON AND HYDROCARBON COMPOUNDS
  • ATMOSPHERE
  • ATMOSPHERIC CHEMISTRY
  • OXYGEN COMPOUNDS
  • ATMOSPHERE
  • AIR QUALITY
  • ATMOSPHERE
  • ATMOSPHERIC CHEMISTRY
  • NITROGEN COMPOUNDS

Data Use and Citation

This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use Policy.

Download citation from Datacite
RISBibTexOther
Crosscite Citation Formatter
Morgan, E.J., B.B. Stephens, J. Bent, A. Watt, S. Afshar, W. Paplawsky, and R.F. Keeling. 2021. ATom: L2 Trace Gas and Isotope Measurements from Medusa Whole Air Sampler, Version 2. ORNL DAAC, Oak Ridge, Tennessee, USA. https://doi.org/10.3334/ORNLDAAC/1881

See our Data Use and Citation Policy for more information.

Data Files

Sign in to download files.

Companion Files

Expand for companion files
Toggle Companion Files

Sign in to download files.

Dataset has 2 companion files.

  • Medusa_readme_210520.pdf
  • ATom_Medusa_Instrument_Data_V2.pdf

Version History

VersionDataset TitlePublished
1ATom: L2 Measurements from Medusa Whole Air Sampler (Medusa)2019-11-26
2ATom: L2 Trace Gas and Isotope Measurements from Medusa Whole Air Sampler, Version 22021-05-24