2007 AGU Fall Meeting, December 10-14,San Francisco, CA
AIRS Data Support at NASA Goddard Earth Sciences Data and Info Services
The Atmospheric Infrared Sounder (AIRS) is a very high-resolution passive infrared sounder. It has more than two thousand well-calibrated spectral channels measuring in the range of 3.74 - 15.4 micron. The AIRS instrument was successfully launched aboard the NASA EOS-Aqua spacecraft in May, 2002 and has been providing global coverage ever since. The infrared radiance data product is stable to 10 mK/year and accurate to better than 250 mK. This product is the most accurate and stable set of hyperspectral infrared radiance spectra measurements made in space to date, and its meets the criteria identified by the National Research Council for climate data records. In addition, working in tandem with an Advanced Microwave Sounding Unit (AMSU-A) instrument, AIRS provides a three-dimensional view of the geophysical properties of the earth Atmosphere. The geophysical products provide daily global temperature profiles at an accuracy of 1 K per 1 km thick layer in the troposphere and moisture profiles at an accuracy of 20% per 2 km thick layer in the lower troposphere (20% - 60% in the upper troposphere).
The standard AIRS data products (Level-1B, Level-2 and Level-3) are available from the NASA Goddard Earth Sciences Data and Information Services Center (GES DISC). The latest version of AIRS products is version5. Improvements in version 5 over the previous version include enhanced Level 2 temperature data products over land and polar regions, first-time retrievals of carbon monoxide methane, improvements to ozone retrievals, and improved error and quality flag parameterization overall.
In addition to the AIRS standard products, the Level-1B and Level-2 AIRS products are also produced in near real time (NRT) at GES DISC facility using the same core science algorithm as in the regular productions, but with slightly simpler production rules. Approximately 80% of AIRS NRT Level-1B products are available to the public within 1.5-2 hours after the time of observation, 2-2.5 hours for 80% of the NRT Level-2 products. The AIRS NRT products are useful for those who need data in quickly. They have been ingested into regional weather forecast models or in support of field experiments.
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