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

Hanwant B. Singh, Anne M. Thompson, H. Schlager

Research output: Contribution to journalArticlepeer-review

67 Scopus citations


The SASS (Subsonic Assessment) Ozone and NO(x) Experiment (SONEX) was an airborne field campaign conducted in October-November 1997 in the vicinity of the North Atlantic Flight Corridor to study the impact of aircraft emissions on NO(x) and ozone (O3). A fully instrumented NASA DC-8 aircraft was used as the primary SONEX platform. SONEX activities were closely coordinated with the European POLINAT-2 (Pollution from Aircraft Emissions in the North Atlantic Flight Corridor) program, which used a Falcon-20 aircraft. Both campaigns focused on the upper troposphere/'lowermost' stratosphere (UT/LS) as the region of greatest interest. Specific sampling goals were achieved with the aid of a state-of-the art modeling and meteorological support system, which allowed targeted sampling of air parcels with desired characteristics. A substantial impact of aircraft emissions on NO(x), O3, and CN in the UT/LS of the study region is shown to be present. This mission provided direct support for the highly nonlinear nature of the NO(x)-O3 chemistry. The results are being published in Special Sections of GRL and JGR. This overview provides a context within which these publications can be understood.

Original languageEnglish (US)
Pages (from-to)3053-3056
Number of pages4
JournalGeophysical Research Letters
Issue number20
StatePublished - Oct 15 1999

All Science Journal Classification (ASJC) codes

  • Geophysics
  • General Earth and Planetary Sciences


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