Outgoing Longwave Radiation Climate Data Record
UMD OLR CDR Portal
Current time:
(Day of Year=)
Major Upgrade Release Notice (2025-08-01)
Daily OLR CDR is upgraded from v01r02 to v02r00
Monthly OLR CDR is upgraded from v02r07 to v03r00.
See C-ATBD Documents for more information.
CATBD for Daily OLR CDR v02r00
CATBD for Monthly OLR CDR v03r00
Products:
1. Daily Mean OLR
- Spatial resolution: 1°x1° equal-angle grid
Temporal coverage: 1979.01.01 - day before yesterday
Refresh rate: daily (36-hr lag)
Observation sources: High-resolution Infrared Radiation Sounder (HRIS) on-board NOAA TIROS-N series and Eumetsat MetOp-A/B polar-orbiting satellites; IASI from Metop-A/B/C; CrIS from NPP, J01, J02; Imagers on-board operational geostationary satellites (via Gridsat CDR and NESDIS GSIP products)
Version info: v02r00 (final CDR); v02r00-preliminary (interim CDR, 36-hr lag)
Data access:
Year 2025 Interim, Released Daily with two-day lag: OLR-Daily_v02r00-preliminary_s20250101_latest.nc
Year 2024 Interim, Released Daily with two-day lag: OLR-Daily_v02r00-preliminary_s20240101_e20241231.nc
Year 1979-2023 Final (concatenated): OLR-Daily_v02r00_s19790101_e20231231.nc
2. Monthly Mean OLR
- Spatial resolution: 2.5°x2.5° equal-angle grid
Temporal coverage: January 1979 - last month
Refresh rate: monthly (on the 5th of the month)
Observation sources: High-resolution Infrared Radiation Sounder (HRIS) on-board NOAA TIROS-N series and Eumetsat MetOp-A/B polar-orbiting satellites; IASI from Metop-A/B/C; CrIS from NPP, J01, J02
Version info: v03r00
Data access (1979-present, updated monthly on the 5th):
v03r00: OLR-Monthly_v03r00_197901_latest.nc (updated monthly on the 5th)
THREDDS: NCEI THREDDS Data Server for Monthly OLR CDR
Animation of Monthly OLR fields for 1979 to present
Please contact Dr. Hai-Tien Lee lee@umd.edu for any questions.
OLR CDR products are funded in part by NOAA National Centers for Environmental Information (NCEI) Climate Data Record (CDR) Program.