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List of datasets covered by this document
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Scope of the document
This document is the Product User Guide and Specifications (PUGS) for the High-Resolution Infrared Radiation Sounder (HIRS) Outgoing Longwave radiation (OLR) Climate Data Record (CDR). This CDR is part of the Essential Climate Variable (ECV) "Earth Radiation Budget" (ERB). This PUGS aims at providing the minimum information a user should get for an appropriate use of the data available through the Copernicus Climate Data Store (CDS).
Executive summary
The monthly mean HIRS OLR CDR is produced and distributed by the National Centers for Environmental Information (NCEI) of the American National Oceanic and Atmospheric Administration (NOAA). The Principal Investigator for this product is Dr. Hai-Tien Lee from the Earth System Science Interdisciplinary Center at University of Maryland (UMD/ESSIC). The data is "brokered" in the Copernicus Climate Data Store (CDS). Therefore, this document mostly provides links to the official user documentation at NOAA/NCEI and at UMD.
The NOAA/NCEI provides the following executive summary for the version 2.7 of the CDR, extracted from the "landing page" of the HIRS OLR CDR at https://doi.org/10.7289/V5222RQP:
"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."
1. Product: monthly mean HIRS OLR CDR
1.1 Product description
The HIRS OLR product is based on the data acquired by the High Resolution Infrared Radiation Sounder (HIRS) instruments (Figure 1) measuring radiances in the infrared (IR).
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Table 1: Description of the HIRS instrument type and level-1b data set coverage available for the HIRS OLR CDR production (from [D1]).
The Outgoing Longwave Radiation (OLR) is the total amount of energy emitted by the Earth and escaping toward the space. This quantity, expressed in W/m², is also called the “longwave flux” or the “thermal flux”. Together with the incoming solar radiation and the reflected solar radiation, it is a component of the Top-of-the-Atmosphere (TOA) Earth Radiation Budget (ERB).
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Figure 2: Illustration of the monthly mean HIRS OLR v02r07 (unit is W/m²).
1.2 Target requirements
The GCOS-154 [D6] provides the following requirements for OLR:
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An assessment of the accuracy of the monthly mean HIRS OLR has been done in the frame of the validation of the Climate Monitoring SAF (CM SAF) TOA Radiation GERB/SEVIRI Data Record - Edition 2 (Clerbaux, N. et al, 2017: CM SAF TOA Radiation GERB/SEVIRI Data Record - Edition 2, Satellite Application Facility on Climate Monitoring, DOI:10.5676/EUM_SAF_CM/TOA_GERB/V002, https://doi.org/10.5676/EUM_SAF_CM/TOA_GERB/V002). The reported uncertainty is about 1 W/m² for the monthly mean HIRS OLR, slightly better than the one obtained in the intercomparison with CERES EBAF (1.8 W/ m²). This difference is mainly due to the correction applied for the overall bias in the CM SAF validation [D4].
1.3 Data usage information
The HIRS OLR CDR ATBD [D2] contains a full list of assumptions and limitations. The ATBD is available at:
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http://olr.umd.edu/References/QA_Summary_OLR-Monthly_and_Daily_CDR_20180831.pdf
2. Data access information
The monthly mean HIRS OLR data can be accessed via the Copernicus Climate Data Store (CDS, see Figure 3) at https://cds.climate.copernicus.eu
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Figure 3: Copernicus CDS Search (https://cds.climate.copernicus.eu/cdsapp#!/search)
2.1 Product ordering process
You need to be registered and logged in to order products in the CDS. A login is provided upon registration, all products in the CDS are delivered free of charge.
2.2 Visualization tool
The data will be available in the CDS Toolbox.
2.3 Documentation
For links to the original documentation on the HIRS OLR CDR see the list of related documents on page 4 in this document.
References
Lee, H.-T., 2014a: Daily OLR CDR – Development and Evaluation. CERES Science Team Meeting, Apr 2014
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Schreck, C. J., H.-T. Lee and K. Knapp, 2018: HIRS Outgoing Longwave Radiation—Daily Climate Data Record: Application toward Identifying Tropical Subseasonal Variability. Remote Sens. 2018, 10, 1325
Appendix A - Specifications for Product monthly mean HIRS OLR CDR
(no specification as brokered data).
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This document has been produced in the context of the Copernicus Climate Change Service (C3S). The activities leading to these results have been contracted by the European Centre for Medium-Range Weather Forecasts, operator of C3S on behalf of the European Union (Delegation agreement signed on 11/11/2014). All information in this document is provided "as is" and no guarantee or warranty is given that the information is fit for any particular purpose. The users thereof use the information at their sole risk and liability. For the avoidance of all doubt , the European Commission and the European Centre for Medium - Range Weather Forecasts have no liability in respect of this document, which is merely representing the author's view. |
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