Longwave Radiative Flux Calculations in the Tovs Pathfinder Path a Data Set

By: Nasa, National Aeronautics and Space Adm

A radiative transfer model developed to calculate outgoing longwave radiation (OLR) and downwelling longwave, surface flux (DSF) from the Television and Infrared Operational Satellite (TIROS) Operational Vertical Sounder (TOVS) Pathfinder Path A retrieval products is described. The model covers the spectral range of 2 to 2800 cm in 14 medium medium spectral bands. For each band, transmittances are parameterized as a function of temperature, water vapor, and ozone profiles. The form of the band transmittance parameterization is a modified version of the approach we use to model channel transmittances for the High Resolution Infrared Sounder 2 (HIRS2) instrument. We separately derive effective zenith angle for each spectral band such that band-averaged radiance calculated at that angle best approximates directionally integrated radiance for that band. We develop the transmittance parameterization at these band-dependent effective zenith angles to incorporate directional integration of radiances required in the calculations of OLR and DSF. The model calculations of OLR and DSF are accurate and differ by less than 1% from our line-by-line calculations. Also, the model results are within 1% range of other line-by-line calculations provided by the Intercomparison of Radiation Codes in Climate Models (ICRCCM) project for clear-sky and cloudy conditions. The model is currently used to calculate global, multiyear (1985-1998) OLR and DSF from the TOVS Pathfinder Path A Retrievals.Mehta, Amita and Susskind, JoelGoddard Space Flight CenterATMOSPHERIC SOUNDING; LONG WAVE RADIATION; RADIATIVE TRANSFER; SATELLITE SOUNDING; TRANSMITTANCE; CLIMATE MODELS; INFRARED INSTRUMENTS; SPECTRAL BANDS; TIROS N SERIES SATELLITES...

• Format: Paperback
• Language: English
• ISBN: 1723856479
• ISBN13: 9781723856471
• Release Date: January 1
• Publisher: Independently Published
• Length: 46 Pages
• Weight: 0.29 lbs.
• Dimensions: 0.1" x 8.5" x 11.0"