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titleTable of Contents

Table of Contents
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History of modifications

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Version

Date

Description of modification

Chapters / Sections

V1.0

31/03/2019

First version

All

V1.1

30/06/2020

Update following CDR extension

Section 1

V1.2

29/03/2021

Update following CDR extension

Section 1

V1.3

08/07/2021

Correction of version numbers

All


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Table 1: Summary of the accuracy of the monthly mean OLR at 2.5° x 2.5° resolution provided in v02r07 of the CDR. The uncertainty is provided at "1 standard deviation" from the intercomparison with CERES EBAF Edition 4.0 (see section 4.1).

Product Name

Processing uncertainties

OLR - Outgoing Longwave Radiation
(field in the HIRS OLR NetCDF files : olr )

1.8 W/m²

1. Validated products

The version v02.r07 of the HIRS OLR CDR provides monthly mean Outgoing Longwave Radiation (OLR) in all sky conditions. The dataset comprises 42 years and 5 months (January 1979 – Feb 2021) of satellite-based measurements derived from the High-Resolution Infrared Radiation Sounder (HIRS) instruments onboard the polar orbiting NOAA and MetOp satellites.

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Table 1-1: Relevant documentation concerning the HIRS OLR CDR

Documents and URLs

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.

https://doi.org/10.3390/rs10091325

Lee, H.-T., 2018: Quality Assurance Summary and Results for Monthly and Daily OLR CDR (rev.20180831).
http://olr.umd.edu/References/QA_Summary_OLR-Monthly_and_Daily_CDR_20180831.pdf

Lee, H.-T., A. Gruber, R. G. Ellingson and I. Laszlo, 2007: Development of the HIRS Outgoing Longwave Radiation climate data set. J. Atmos. Ocean. Tech., 24, 2029–2047.

http://olr.umd.edu/References/Lee_et_al_2007_HIRS_OLR_CDR.pdf

Climate Algorithm Theoretical Basis Document (C-ATBD) for Monthly OLR CDR v02r07

http://olr.umd.edu/References/CDRP-ATBD-0097%20Rev%204%20Outgoing%20Longwave%20Radiation%20-%20Monthly%20(01B-06)%20(DSR-1210)%20Final.pdf

Lee, H.-T., 2014: Daily OLR CDR – Development and Evaluation. CERES Science Team Meeting, Apr 2014

http://olr.umd.edu/References/Lee%202014%20Daily%20OLR%20CDR%20%E2%80%93%20Development%20and%20Evaluation%20-%20CERES_STM_Apr2014.pdf

Lee, H.-T., 2014: Daily OLR Climate Data Record. EGU General Assembly, Apr 2014

http://olr.umd.edu/References/Lee_2014_Daily_OLR_Climate_Data_Record_EGU_Apr2014.pdf

Lee, H.-T., C. J. Schreck, and K. R. Knapp, 2014: Generation of Daily OLR CDR. Eumetsat Meteorological Satellite Conference, Sep 2014

http://olr.umd.edu/References/Lee_2014_Generation_of_Daily_OLR_CDR_Eumetsat_Sep2014.pdf

Read me for Daily OLR CDR v01r02

http://olr.umd.edu/References/Read%20me%20for%20Daily%20OLR%20CDR%20v01r02.txt

2. Description of validating datasets

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Table 4-1: Summary of KPI results with 2.5 and 97.5 percentiles and number of ICDR months within the range. Colors green or red mark the results of the binomial tests as good or bad, respectively.


Outgoing Longwave Radiation
Percentiles

p2.5 = -5.35 W/m²

p97.5 = -3.02 W/m²

01/2021 - 11/2021

9/9

12/2021 - 04/2022

5/5

05/2022 - 09/2022

Reference data not available

10/2022 - 05/2023

8/8

Percentiles were calculated based on the comparison of the TCDR using the High Resolution Infrared Radiation Sounder (HIRS) instrument onboard NOAA and Metop satellites against ERA5 data for the variable Outgoing Longwave Radiation (OLR). Reference period is defined from 01/1979 to 12/2020. The complete ICDR remains within the limits leading to "good" KPI tests. The ICDR is therefore stable in relation to the deeply validated TCDR.

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