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Reference ID | Document | D1 | C3S Lot 1 contract (2018/C3S_312b_Lot1_DWD/SC1) | D2 | [GCOS-154] Systematic Observation Requirements for Satellite-based Products for Climate Supplemental details to the satellite-based component of the Implementation Plan for the Global Observing System for Climate in Support of the UNFCCC, 2011 Update, December 2011. World Meteorological Organization, Geneva, Switzerland. Available from https://library.wmo.int/doc_num.php?explnum_id=3710 . | D3 | [GCOS-200] The Global Observing system for climate: Implementation needs, 2016, World Meteorological Organization, Geneva, Switzerland. Available from http://www.wmo.int. | D4 | CM SAF CDOP2 Product Requirement Document, SAF/CM/DWD/PRD, v3.7 Available from: https://www.cmsaf.eu/SharedDocs/Literatur/document/2020/saf_cm_dwd_prd_3_7_pdf.pdf?__blob=publicationFile&v=2 | D5 | CLARA-A2.1 Product User Manual, Cloud products, SAF/CM/DWD/PUM/GAC/CLD, v2.6, 15.05.2020. Available from: https://www.cmsaf.eu/SharedDocs/Literatur/document/2020/saf_cm_dwd_pum_gac_cld_2_6_pdf.html | D6 | Validation Report, AVHRR GAC cloud products, Edition 2.1, SAF/CM/DWD/VAL/GAC/CLD/2.6, 15.05.2020. Available from: | D7 | Algorithm Theoretical Baseline Document CLARA-A2 Cloud Products; SAF/CM/DWD/ATBD/CLARA/CLD/2.5, 13.02.2020. Available from: https://www.cmsaf.eu/SharedDocs/Literatur/document/2020/saf_cm_dwd_atbd_gac_cld_2_5_pdf.pdf?__blob=publicationFile | D8 | Algorithm Theoretical Baseline Document Cloud Mask Products (NWC SAF PPS v2014); SAF/CM/SMHI/ATBD/CMA_AVHRR/2.1, 15.05.2020. Available from: https://www.cmsaf.eu/SharedDocs/Literatur/document/2020/saf_cm_smhi_atbd_gac_cma_avhrr_2_1_pdf.html | D9 | Algorithm Theoretical Baseline Document Cloud Top Height Products (NWC SAF PPS v2014); SAF/CM/SMHI/ATBD/CTX_AVHRR/2.1, 15.05.2020. Available from: https://www.cmsaf.eu/SharedDocs/Literatur/document/2020/saf_cm_smhi_atbd_gac_ctx_avhrr_2_1_pdf.html | D10 | Algorithm Theoretical Baseline Document Cloud Physical Products (NWC SAF PPS v2014); SAF/CM/SMHI/ATBD/CPP_AVHRR, 15.05.2020. Available from: https://www.cmsaf.eu/SharedDocs/Literatur/document/2020/saf_cm_smhi_atbd_gac_cpp_avhrr_2_1_pdf.html | D11 | Report on Updated KPIs, C3S_D312b_Lot1.0.4.8_201903_Updated_KPIs_v1.0. Key Performance Indicators (KPIs) | D12 | ESA Cloud CCI Product User Guide, v.5.1, 16.01.2020. Available from: https://climate.esa.int/media/documents/Cloud_Product-User-Guide-PUG_v5.1.pdf | D13 | ESA Cloud CCI Product Validation and Intercomparison Report, v.6.0, 03.02.2020. Available from: https://climate.esa.int/media/documents/Cloud_Product-Validation-and-Intercomparison-Report-PVIR_v6.0.pdf | D14 | ESA Cloud CCI Algorithm Theoretical Basis Document, v.6.2, 14.10.2019. Available from: https://climate.esa.int/media/documents/Cloud_Algorithm-Theoretical-Baseline-Document-ATBD_v6.2.pdf | D15 | ESA Cloud CCI Algorithm Theoretical Basis Document: Community Cloud retrieval for Climate (CC4Cl), v.6.2, 18.10.2019. Available from: https://climate.esa.int/media/documents/Cloud_Algorithm-Theoretical-Baseline-Document-ATBD-CC4CL_v6.2.pdf |
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More details on the estimation of errors and uncertainty parameters are given in the Report on Updated KPIs' (D11, e.g. section 2.1).
Scope of the document
This document provides relevant information on requirements and gaps for the TCDR AVHRR CLARA v2.0 Cloud Properties product (known as CLARA-A2.1) and its associated ICDR v2.x, and the Cloud-CCI (A)ATSR CC4CL/ORAC v3.0 cloud properties TCDR. It is divided into three parts. Part 1 describes the products the present document refers to. Part 2 provides the target requirements for the products. Part 3 provides a past, present, and future gap analysis for the products and covers both gaps in the data availability and scientific gaps that could be addressed by further research activities (outside C3S).
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The products associated with the AVHRR CLARA v2.0 Cloud Properties TCDR are described together with their target requirements. For the four cloud products cloud fractional cover (CFC), cloud top pressure (CTP), liquid water path (LWP) and ice water path (IWP) the mean error requirements are 5 %, 50 hPa, 10 gm-2 and 20 gm-2, respectively. Corresponding stability requirements are 2 % per decade, 20 hPa per decade, 3 gm-2 per decade and 6 gm-2 per decade, respectively.
Key Performance Indices (KPIs) for ICDR products to be produced for the extension of the TCDR have been defined using MODIS Level 3 products as reference observations. The KPI test is based on a binomial test against low (2.5%) and high (97.5%) percentiles of the MODIS-CLARA difference distribution (D11, sections 3 and 4.2.1 and Table 3). The low and high percentiles are given in the following table:
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Variable | KPI: lower percentile
(2.5 %)
| KPI: higher percentile
(97.5 %) |
CFC | -0.718 % | 0.576 % |
CTP | -7.036 hPa | 4.353 hPa |
LWP | -0.0021 g/m² | 0.0022 g/m2 |
IWP | -0.0031 g/m² | 0.0021 g/m² |
These percentiles are used to check, by means of a binomial test at 5 % significance level, whether the corresponding ICDR differences are consistent with the TCDR differences or not. Further details on these tests are found in the Report on Updated KPIs' (D11, chapter 3).
2.1.5 Discussion of requirements with respect to GCOS and other requirements
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