SAS/NOMADSS/SOAS

The Southeast Atmosphere Study (SAS) is a collaboration that brings together resources and facilities from NSF, NOAA, EPA, and EPRI. The SAS is the "umbrella" for the NOMADSS, SOAS, NAAMEX, TROPHONO, and SENEX projects.

NOMADSS: Nitrogen, Oxidants, Mercury and Aerosol Distributions, Sources and Sinks

The Nitrogen, Oxidants, Mercury and Aerosol Distributions, Sources and Sinks (NOMADSS) project consisted of 19 research flights with the C-130 over the Southeast U.S. between June 1 and July 15, 2013.  NOMADSS integrated three proposed airborne studies: the Southern Oxidant and Aerosol Study (SOAS), the North American Airborne Mercury Experiment (NAAMEX), and the TROPospheric HONO (TROPHONO), and is a component of the Southeast Atmosphere Study (SAS).

Project information:


C-130 Data Merges:

Merged data files have been created, combining all observations on the C-130 to a common time base for each flight.  Version R5 (created Jan 21, 2015) of the merges includes all data available as of Jan 12, 2015.  Please consult the individual instrument PIs before using their data (see the Data Policy).

All merge files are available from the EOL Archive for SAS/NOMADSS.

  • 1-sec merge – All values from individual files are written out for each second. Missing, LLOD, ULOD values for all variables replaced with standard values (-9999999, -8888888, -7777777)
  • 1-min merge - Time is midpoint of 60-sec average; Any measurement that overlaps the 60-sec window is included in the average; no limit on the length of overlap; weighted average is performed.
      All ULOD and LLOD values are treated as missing and left out of the averages.  Missing values for all variables set to -9999999.
  • TOGA merge – Start, stop and mid times are taken from the TOGA file and used for the averaging period.  Averaging and missing value treatment as in 1-min merge. 
  • DOHGS merge – Start and stop times taken from the DOHGS file, midtime calculated from them.  Averaging and missing value treatment as in 1-min merge.


Questions regarding the merges may be directed to Louisa Emmons (NCAR/ACOM).

Long name: 
Southeast Atmosphere Study / Nitrogen, Oxidants, Mercury and Aerosol Distributions, Sources and Sinks / Southern Oxidant & Aerosol Study
Dates: 
June 1, 2013 to July 31, 2013
Location: 
Smyrna, TN
Data status: 
Partially final, not public

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ACOM | Atmospheric Chemistry Observations & Modeling