Outgoing Longwave Radiation (OLR) data at the top of the atmosphere are
observed from the AVHRR instrument aboard the NOAA polar orbiting spacecraft. The units are watts/meter2.
These data are available as twice daily observation
monthly means. Daily OLR data from
January 1979 to present are available at the Climate
Diagnostic Center ftp site.
The data are on a 2.5 x 2.5 degree lat/lon grid and are stored in 144 X 73 arrays
that are oriented North Pole -> South Pole and eastward from Greenwich; note that
all 144 values for j=1 and j=73 are for the north & south poles, respectively.
Pentad anomalies are computed with respect to the 1979 - 1995 base period.
Chelliah, M. and P. Arkin, 1992: Large-Scale Interannual Variability
of Monthly Outgoing Longware Radiation Anomalies over the Global Tropics.
J. Climate, 5, 371-389.
Gruber A. and A. F. Krueger, 1984: The Status of hte NOAA Outgoing
Longwave Radiation Data Set. Bull. Amer. Meteor. Soc., 65, 958-962
Janowiak J. E., A.F.Krueger, P.A. Arkin and A. Gruber, 1985: Atlas of
Outgoing Longwave Radiation Derived from NOAA Satellite Data NOAA Atlas
No. 6 ( Available from Climate Prediction Center ), 44pp.
Liebmann B. and C.A.Smith, 1996: Description of a Complete ( Interpolated )
Outgoing Longwave Radiation Dataset. Bull. Amer. Meteor. Soc., 77, 1275-1277.