Outgoing Longwave Radiation Climate Data Record
UMD OLR CDR Portal
Current time:
(Day of Year=)
NOTICE (2023.11.01)
Daily and Monthly OLR CDR data sets have been reprocessed for the period of 2007.01.01-present to include IASI and CrIS OLR retrievals for OLR CDR production. Please update your previously downloaded data.
Please read the "Technical Note" documents below for details of the changes.
Technical Note for IASI & CrIS data extension for OLR-Daily
Technical Note for IASI & CrIS data extension for OLR-Monthly
Technical Note for IASI & CrIS data extension for OLR-Monthly
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; Imagers on-board operational geostationary satellites (via Gridsat CDR and NESDIS GSIP products)
Version info: v01r02 (final CDR); v01r02-preliminary (interim CDR, 36-hr lag)
Data access:
Year 2025 Interim, Released Daily with two-day lag: olr-daily_v01r02-preliminary_20250101_latest.nc
Year 2024 Interim, Released Daily with two-day lag: olr-daily_v01r02-preliminary_20240101_20241231.nc
Year 2023 Final, Released 7/19/2024: olr-daily_v01r02_20230101_20231231.nc
Year 2022 Final, Reprocessed, Released 11/01/2023: olr-daily_v01r02_20220101_20221231.nc
Year 1979-2022 Final, Concatenated, Reprocessed: olr-daily_v01r02_19790101_20221231.nc
Year 1979-2021 Final: NCEI Daily OLR CDR Data Server
THREDDS: NCEI THREDDS Data Server for Daily OLR CDR
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 (HIRS) on-board NOAA TIROS-N series and Eumetsat MetOp-A/B polar-orbiting satellites
Version info: v02r07 (new, replacing v02r02-1 since July 2018)
Data access (1979-present, updated monthly on the 5th):
v02r07, Reprocessed: olr-monthly_v02r07_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.