NASA Ames Sunphotometer-Satellite Team
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Solar Occultation Satellite Science Team &

SAGE III Ozone Loss Validation Experiment II

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SOSST Background

The Solar Occultation Satellite Science Team (SOSST) replaces the science teams for the Stratospheric Aerosol and Gas Experiments, SAGE II and SAGE III, and broadens their scope to include other solar occultation satellite sensors. Over the past 20 or more years, solar occultation satellite instruments have played an important role in NASA's systematic observations program by providing accurate and stable measurements of aerosols, ozone, and other trace constituents in the middle atmosphere and upper troposphere. Previous solar occultation satellite missions that have provided important contributions include Stratospheric Aerosol Measurement (SAM) II from 1978-1993; Stratospheric Aerosols and Gas Experiment (SAGE) I from 1979-81 and SAGE II from 1984-present; Atmospheric Trace Molecule Spectroscopy Experiment (ATMOS) flown on the Space Shuttle in 1985, 1992, 1993, and 1994; Polar Ozone Aerosol Measurement (POAM) II from 1993-96 and POAM III from 1998-present; and Halogen Occultation Experiment (HALOE) from1984-present. The SAGE III instrument is a new and advanced instrument from the SAGE instrument family and was launched on board the Russian Meteor-3M spacecraft in December 2001.

SOSST activities include an emphasis on the validation and utilization of data from the SAGE III/Meteor-3M satellite mission, as well as data from other missions with similar satellite occultation measurement characteristics. Emphasis is placed on preparing data sets that can be connected to those of predecessor instruments, and to using the unique capability of the SAGE III instrument. SOSST analyses use data on ozone, aerosols, and the other constituents measured by SAGE III and the other sensors listed above. Other SOSST activities include (i) the development of retrieval techniques to improve existing satellite occultation products and, (ii) the development of new products, such as ozone retrievals from limb-scattering measurements


SOLVE II Background

The SAGE III Ozone Loss and Validation Experiment (SOLVE II) was a measurement campaign designed to examine the processes controlling ozone levels at mid- to high latitudes. Measurements were made in the Arctic high-latitude region in winter 2002-03 using the NASA DC-8 aircraft, as well as balloon platforms and ground-based instruments. The mission also acquired correlative data needed to validate the Stratospheric Aerosol and Gas Experiment (SAGE) III satellite measurements that will be used to quantitatively assess high-latitude ozone loss. SOLVE is co-sponsored by the Upper Atmosphere Research Program (UARP), Atmospheric Effects of Aviation Project (AEAP), Atmospheric Chemistry Modeling and Analysis Program (ACMAP), and Earth Observing System (EOS) of NASA's Earth Science Enterprise (ESE) as part of the validation program for the SAGE III instrument.

The 14-channel Ames Airborne Tracking Sunphotometer (AATS-14) flew on the DC-8 in SOLVE II, acquiring measurements of ozone, aerosols, and water vapor.



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