Outgoing Longwave Radiation - Monthly
Image of Monthly Mean OLR.
This Climate Data Record (CDR) of monthly mean Outgoing Longwave Radiation (OLR) flux at the top of the atmosphere in all sky conditions is on a 2.5 degree x 2.5 degree grid with global coverage from January 1979 to the present and continuing monthly. It is derived based on the multispectral High Resolution Infrared Radiation Sounder (HIRS) OLR algorithm and other methodologies. This dataset was created from HIRS OLR retrievals from TIROS-N to NOAA-19, and MetOp-A/B satellites with inter-satellite calibration adjustments and employed the empirical diurnal model for monthly mean derivation. This version 2.7 is an upgrade from the previous version 2.2-1. The main change is in the OLR regression models and the inter-satellite calibration. The version 2.7 OLR regression models improved the retrieval consistency between variant versions of HIRS instruments, HIRS-2, 2i, 3 and 4, and in turn, the accuracy of inter-satellite calibration is significantly improved, thus eliminating the spurious trends presented in the version 2.2-1 data. 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.
Dataset Citation
- Cite dataset when used as a source: Hai-Tien Lee and NOAA CDR Program (2018): NOAA Climate Data Record (CDR) of Monthly Outgoing Longwave Radiation (OLR), Version 2.7. [indicate subset used]. NOAA National Centers for Environmental Information. https://doi.org/10.7289/V5W37TKD [access date].
Dataset Identifiers
- doi:10.7289/V5W37TKD
- NCEI DSI 3690_03
- gov.noaa.ncdc:C01561
ISO 19115-2 Metadata
gov.noaa.ncdc:C01561
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Ordering Instructions | Contact NCEI for other distribution options and instructions. |
Distributor | NOAA National Centers for Environmental Information ncei.info@noaa.gov |
Dataset Point of Contact | NOAA Climate Data Record Program Office DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce +1 (828) 271-4800 monthly_olr_contacts@noaa.gov |
Time Period | 1979-01-01 to Present |
Spatial Bounding Box Coordinates | West: -180.0 East: 180.0 South: -90.0 North: 90.0 |
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Edition | Version 2.7 |
Data Presentation Form | Digital image |
Dataset Progress Status | Ongoing - data is continually being updated |
Data Update Frequency | Monthly |
Purpose | This dataset provides a high quality Climate Data Record (CDR) of Outgoing Longwave Radiation (OLR). The amount of terrestrial radiation that is released into space and, by extension, the amount of cloud cover and water vapor that intercepts that radiation in the atmosphere defines the Monthly OLR CDR. Uses include conducting studies/operation in global change monitoring, earth radiation budget, precipitation, tropical dynamics and monsoon diagnostics/forecast and tropical expansion. |
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Theme keywords | Global Change Master Directory (GCMD) Science Keywords
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Data Center keywords | Global Change Master Directory (GCMD) Data Center Keywords
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Platform keywords | Global Change Master Directory (GCMD) Platform Keywords
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Instrument keywords | Global Change Master Directory (GCMD) Instrument Keywords
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Place keywords | Global Change Master Directory (GCMD) Location Keywords
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Project keywords | Global Change Master Directory (GCMD) Project Keywords
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Last Modified: 2023-08-10
For questions about the information on this page, please email: ncei.info@noaa.gov