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HOME > Monitoring and Data > Oceanic & Atmospheric Data > Global Precipitation Monitoring > Outgoing Longwave Radiation (OLR)
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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
NOAA-17 and
NOAA-18,
pentad means
and
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.
References:
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.
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