Interim Review of the Subsonic Assessment Project: Management, Science, and Goals (1997)
Chapter: Front Matter
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Preface
The Subsonic Assessment (SASS) project is the half of NASA's Atmospheric Effects of Aviation Project (AEAP) that is oriented toward the current and future fleets of subsonic aircraft flying in the upper troposphere and lower stratosphere. A component of the Advanced Subsonic Technology Program, SASS has the overall objective of developing an assessment that can answer the questions of how aircraft emissions and their subsequent products affect ozone, radiative forcing, and, ultimately, climate. Begun in late 1993, SASS collected data and developed models in 1994 and 1995, and undertook its first field campaign in 1996. A first project report was also issued in 1996; this panel has drawn heavily on that report in evaluating the progress of SASS. NASA's first assessment report on SASS is due to be published in mid-1997.
The present review of SASS is the product of the NRC Panel on the Atmospheric Effects of Aviation (PAEAN). PAEAN consists of sixteen people selected to provide expertise in relevant fields that include field observations, laboratory chemistry, atmospheric dynamics and modeling, aircraft engines, climate, and public policy. The charge from its NASA sponsor, AEAP, is to provide assessment of and guidance to AEAP by evaluating the appropriateness of AEAP's research plan, appraising the project-sponsored results relative to the current state of scientific knowledge, identifying key scientific uncertainties, and suggesting research activities likely to reduce those uncertainties. The effects of the current subsonic fleet are of particular concern at the moment, and in this report (one of three in process) PAEAN has focused on how AEAP can most effectively increase understanding of the processes involved. Only issues relating to impacts on the upper troposphere have been addressed, however; possible
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