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NOAA Climate Data Record (CDR) of Daily Outgoing Longwave Radiation (OLR), Version 2.0

Published by NOAA National Centers for Environmental Information | National Oceanic and Atmospheric Administration, Department of Commerce | Metadata Last Checked: April 12, 2026 | Last Modified: 2025-08-26T00:00:00.000+00:00
This Climate Data Record (CDR) contains the daily mean Outgoing Longwave Radiation (OLR) time series in global 1 degree x 1 degree equal-angle gridded maps spanning from January 1, 1979 to present, and continuing daily with a two-day lag. The OLR is estimated from radiance observations from the operational polar-orbiting sounding instruments, including HIRS, IASI and CrIS, via multispectral OLR algorithm for HIRS, and spectral flux estimation algorithms for the hyper-spectral instruments, along with other temporal and spatial averaging methodologies. These OLR CDR products are generated with HIRS/IASI/CrIS OLR retrievals from TIROS-N series satellites, MetOp series satellites, and JPSS series satellites. The OLR retrievals are inter-satellite calibrated and maintain radiometric traceability, while using geostationary-estimated OLR to accurately account for diurnal variations for Daily mean product derivation. The new HIRS OLR regression coefficients improve the retrieval consistency between HIRS-based OLR retrievals and IASI/CrIS-based OLR retrievals. The data file format is netCDF-4 with CF metadata, and it is accompanied by algorithm documentation, data flow diagram and source code for the NOAA CDR Program.

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  • NCEI Dataset Landing Page

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  • NCEI CDR Information Page

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  • AWS S3 Download

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  • Extending the HIRS Data Record with IASI Measurements

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  • HIRS Outgoing Longwave Radiation—Daily Climate Data Record: Application toward Identifying Tropical Subseasonal Variability

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  • Using IASI to simulate the total spectrum of outgoing long-wave radiances

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  • NCEI Dataset Landing Page

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  • Global Change Master Directory (GCMD) Keywords

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  • CDR Program Contacts

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Earth Science > Atmosphere > Atmospheric Radiation > Outgoing Longwave Radiation Geographic Region > Global Land NOAA OneStop Project HIRS-2 > High Resolution Infra-red Sounder/2 HIRS-3 > High Resolution Infra-red Sounder/3 HIRS-4 > High Resolution Infra-red Sounder/4 IASI > Infrared Atmospheric Sounding Interferometer CrIS > Cross-track Infrared Sounder

Complete Metadata
@type dcat:Dataset
accessLevel non-public
accrualPeriodicity R/P1D
contactPoint 
                                            {
  "fn": "NOAA National Centers for Environmental Information",
  "@type": "vcard:Contact",
  "hasEmail": "mailto:daily_olr_contacts@noaa.gov"
}
describedByType application/octet-steam
description This Climate Data Record (CDR) contains the daily mean Outgoing Longwave Radiation (OLR) time series in global 1 degree x 1 degree equal-angle gridded maps spanning from January 1, 1979 to present, and continuing daily with a two-day lag. The OLR is estimated from radiance observations from the operational polar-orbiting sounding instruments, including HIRS, IASI and CrIS, via multispectral OLR algorithm for HIRS, and spectral flux estimation algorithms for the hyper-spectral instruments, along with other temporal and spatial averaging methodologies. These OLR CDR products are generated with HIRS/IASI/CrIS OLR retrievals from TIROS-N series satellites, MetOp series satellites, and JPSS series satellites. The OLR retrievals are inter-satellite calibrated and maintain radiometric traceability, while using geostationary-estimated OLR to accurately account for diurnal variations for Daily mean product derivation. The new HIRS OLR regression coefficients improve the retrieval consistency between HIRS-based OLR retrievals and IASI/CrIS-based OLR retrievals. The data file format is netCDF-4 with CF metadata, and it is accompanied by algorithm documentation, data flow diagram and source code for the NOAA CDR Program.
distribution 
                                            [
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    "@type": "dcat:Distribution",
    "title": "NCEI Dataset Landing Page",
    "accessURL": "https://doi.org/10.25921/9pt5-by77",
    "mediaType": "text/html",
    "description": "Landing page for the dataset.",
    "describedByType": "application/octet-stream"
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  {
    "@type": "dcat:Distribution",
    "title": "NCEI CDR Information Page",
    "accessURL": "https://www.ncei.noaa.gov/products/climate-data-records/outgoing-longwave-radiation-daily",
    "mediaType": "text/html",
    "description": "CDR overview and documentation.",
    "describedByType": "application/octet-stream"
  },
  {
    "@type": "dcat:Distribution",
    "title": "AWS S3 Download",
    "accessURL": "https://archive.data.noaa.gov/cdr#UMD_ESSIC/OLR_CDR/Daily/OLR-D-CDR_01B-21/",
    "mediaType": "text/html",
    "description": "S3 Bucket access for dataset files.",
    "describedByType": "application/octet-stream"
  },
  {
    "@type": "dcat:Distribution",
    "title": "Extending the HIRS Data Record with IASI Measurements",
    "accessURL": "https://doi.org/10.3390/rs15030717",
    "mediaType": "text/html",
    "description": "DOI",
    "describedByType": "application/octet-stream"
  },
  {
    "@type": "dcat:Distribution",
    "title": "HIRS Outgoing Longwave Radiation—Daily Climate Data Record: Application toward Identifying Tropical Subseasonal Variability",
    "accessURL": "https://doi.org/10.3390/rs10091325",
    "mediaType": "text/html",
    "description": "DOI",
    "describedByType": "application/octet-stream"
  },
  {
    "@type": "dcat:Distribution",
    "title": "Using IASI to simulate the total spectrum of outgoing long-wave radiances",
    "accessURL": "https://doi.org/10.5194/acp-15-6561-2015",
    "mediaType": "text/html",
    "description": "DOI",
    "describedByType": "application/octet-stream"
  },
  {
    "@type": "dcat:Distribution",
    "title": "NCEI Dataset Landing Page",
    "accessURL": "https://doi.org/10.25921/edx3-v958",
    "mediaType": "text/html",
    "description": "Landing page for the related dataset.",
    "describedByType": "application/octet-stream"
  },
  {
    "@type": "dcat:Distribution",
    "title": "Global Change Master Directory (GCMD) Keywords",
    "accessURL": "https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords",
    "mediaType": "text/html",
    "description": "The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords.",
    "describedByType": "application/octet-stream"
  },
  {
    "@type": "dcat:Distribution",
    "title": "CDR Program Contacts",
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]
identifier https://data.noaa.gov/waf/NOAA/NESDIS/ncei/aim/iso/xml/C01732.xml
issued 2025-08-26T00:00:00.000+00:00
keyword 
                                            [
  "Earth Science > Atmosphere > Atmospheric Radiation > Outgoing Longwave Radiation",
  "Geographic Region > Global Land",
  "NOAA OneStop Project",
  "HIRS-2 > High Resolution Infra-red Sounder/2",
  "HIRS-3 > High Resolution Infra-red Sounder/3",
  "HIRS-4 > High Resolution Infra-red Sounder/4",
  "IASI > Infrared Atmospheric Sounding Interferometer",
  "CrIS > Cross-track Infrared Sounder",
  "TIROS-N > Television Infrared Observation Satellite - N",
  "NOAA-6 > National Oceanic & Atmospheric Administration - 6",
  "NOAA-7 > National Oceanic & Atmospheric Administration - 7",
  "NOAA-8 > National Oceanic & Atmospheric Administration - 8",
  "NOAA-9 > National Oceanic & Atmospheric Administration - 9",
  "NOAA-10 > National Oceanic & Atmospheric Administration - 10",
  "NOAA-11 > National Oceanic & Atmospheric Administration - 11",
  "NOAA-12 > National Oceanic & Atmospheric Administration - 12",
  "NOAA-14 > National Oceanic & Atmospheric Administration - 14",
  "NOAA-15 > National Oceanic & Atmospheric Administration - 15",
  "NOAA-16 > National Oceanic & Atmospheric Administration - 16",
  "NOAA-17 > National Oceanic & Atmospheric Administration - 17",
  "NOAA-18 > National Oceanic & Atmospheric Administration - 18",
  "NOAA-19 > National Oceanic & Atmospheric Administration - 19",
  "NOAA-20 > Joint Polar Satellite System - 1",
  "NOAA-21 > Joint Polar Satellite System - 2",
  "MetOp-A > Meteorological Operational Polar Satellite - A",
  "MetOp-B > Meteorological Operational Polar Satellite - B",
  "MetOp-C > Meteorological Operational Polar Satellite - C",
  "Suomi-NPP > Suomi National Polar-orbiting Partnership",
  "DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce"
]
language 
                                            []
license https://creativecommons.org/publicdomain/zero/1.0/
modified 2025-08-26T00:00:00.000+00:00
publisher 
                                            {
  "name": "NOAA National Centers for Environmental Information",
  "@type": "org:Organization"
}
references 
                                            [
  "https://doi.org/10.3390/rs15030717",
  "https://doi.org/10.3390/rs10091325",
  "https://doi.org/10.5194/acp-15-6561-2015",
  "https://doi.org/10.25921/edx3-v958"
]
rights otherRestrictions
spatial 180.0,-90.0,-180.0,90.0
temporal 1979-01-01T00:00:00+00:00/1979-01-01T00:00:00+00:00
title NOAA Climate Data Record (CDR) of Daily Outgoing Longwave Radiation (OLR), Version 2.0

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