PATMOS-x AVHRR Pathfinder Atmospheres - Extended


patmosx logo With funding from the NOAA/NESDIS Office of Research and Applications (ORA), we have initiated a pilot project for reprocessing the entire AVHRR GAC archive within ORA.   This project is just one component of a larger effort. PATMOS-x is the next generation of the PATMOS project which ceased in 1999.   PATMOS reprocessed the data from afternoon AVHRR's from 1981 to 1999 and its data is available via CLASS.  PATMOS-x differs from the original PATMOS in many ways. Note, PATMOS-x is not part of the now defunct NOAA/NASA Pathfinder Program nor is it guided by the original PATMOS science steering committee.

PATMOS-x is a project to derive atmospheric and surfac climate records from the roughly 25 years of data from NOAA's Advanced Very High Resolution Radiometer (AVHRR) flown on the POES spacecraft.  PATMOS-x consists of twice daily fields from all of AVHRR/2 and AVHRR/3 data from 1981 to the present. In addition, monthly averaged fields are also available from single and multiple satellites.  The PATMOS-x philosophy is to generate multiple products (cloud, aerosol, surface and radiometric) on the same grid using a common processing path.  While the spatial resolution (0.5deg)  is coarser than that typically offered by other climatologies that focus on surface products, we feel that having all of products togethers allows for a more thorough diagnosis of any one time-series.

The specific goals of PATMOS-x are

  • demonstrate that ORA could develop the infrastructure for reprocessing of the 32 TB of AVHRR GAC data and prepare for the coming NESDIS SDS program.
  • Implement improved algorithms develop since the end of PATMOS that mitigate weaknesses noted in PATMOS or add new products.
  • make climate data records (both radiometric and derived products) in an easy to use format and size for the existing PATMOS users and NOAA's climate data customers in general (in partnership with NCDC).
  • Develop cloud climatologies that are physically consistent with those from EOS and NPOESS so that the 30 years of POES data contribute the climate missions of more advanced sensors.
  • Improve the accuracy of the geolocation and reflectance calibrations of the AVHRR data-record

PATMOS-x speaks to the following NOAA goals:

  • Understand Climate Variability and Change to Enhance Society's Ability to Plan and Respond
  • Serve Society's Needs for Weather and Water Information