Photosynthetically Active Radiation (PAR)
as Observed from Satellites

Department of Atmospheric and Oceanic Science
University of Maryland, College Park
Department of Meterology




Satellite Data

Available PAR Parameters


Data Distribution

Data Access





Back to Front Page

Data Distribution

  • A  data set of  3-hourly monthly mean values of global scale PAR for the years 1987-88 has been prepared for the ISLSCP-I  CD-ROM at NASA/GSFC (Meeson et al., 1995; Sellers et al., 1995). These data are based on the ISCCP C1 observations, at 2.5 degree resolution.  To meet the needs of ISLSCP -I  initiative, the data were gridded to one degree.  Due to missing observations, software was developed for gap filling so all investigators can use a uniform data base. The filled data are flagged and can be replaced.

  • Five years (1983-88) of satellite based estimates of monthly mean PAR and the conversion factor (CF) from the  ISCCP C1 are archived on a CD ROM and  are available from the National Environmental Satellite, Data, and Information Center, National Geophysical Data Center, Boulder, Colorado, entitled: "Global Ecosystems Database: Disk B".  Details can be found at:

  •  For information on data that are at this Web site go to Data Access.

  • Eleven years of (1983-1994) of satellite based estimates of monthly mean PAR from the ISCCP D1 data were produced and are available from:

Maintained by Banglin Zhang and Chuan Li