Contributors: Hans Gleisner (DMI)
History of modifications
List of datasets covered by this document
Related documents
Acronyms
General definitions
Scope of the document
This document is the Product Quality Assessment Report (PQAR) for the Gridded Tropospheric Humidity Profiles (product C3S_D312b_Lot1.3.3.9) based on GNSS Radio Occultation (RO) measurements. It provides references to the quality assessment (validation and operational quality monitoring) done as a part of the normal ROM SAF operations, and documented in the ROM SAF Validation Reports [D1-3]. The product quality assessment is based on methods referenced in the Product Quality Assurance Document.
Executive summary
The project C3S_312b_Lot1 includes brokering of gridded monthly-mean tropospheric humidity data from the EUMETSAT ROM SAF. This document refers to the ROM SAF documentation [D1,2] describing the product validation methodology and validation results, including the main validation results in graphical form.
The ROM SAF documentation covers both the CDR (ROM SAF product GRM-29-L3-H-R1) and the ICDR (ROM SAF product GRM-29-L3-H-I1). The CDR covers the time period December 2006 to December 2016, while the ICDR covers the time period from January 2017 and onward, being regularly updated with a three-month delay. The regularly updated ICDR has the same characteristics as the CDR, which has been generated in a ROM SAF reprocessing activity.
1. Product validation methodology
The validation includes the ROM SAF products GRM-29-L3-H-R1 and GRM-29-L3-H-I1, both containing gridded monthly mean tropospheric humidity data and associated variables. These products are described by the ROM SAF Product User Manual [D4].
The validation methods are described in the beginning of Section 4 of the ROM SAF Level 3 Validation Report [D2], and the actual requirements are stated in Section 6 and in Annex A of the same document.
2. Validation results
The main validation results are given in Section 5.2 (Figure 22a) of the ROM SAF Level 3 Validation Report [D2]. Additional validation results, relevant for the quality assessment are shown in Section 4.2.2 (Figure 8e) and in Section 5.1 (Figure 20e) of the same report [D2].
The ROM SAF ICDR time series are mainly validated regarding the stability in time. In the ROM SAF ICDR validation report [D3], the continuity across the CDR-ICDR and the ICDR v1.0-v1.1 transitions are evaluated. The results relevant for the humidity data are Figures 3 and 6 in that report [D3].
3. Application(s) specific assessments
This section is not applicable.
4. Compliance with user requirements
The main validation results are discussed in Sections 4.2.5, 5.3, and 7 of the ROM SAF Level 3 Validation Report [D2], followed by a formal statement of compliance.
References
References are found in Section 1.2 of the ROM SAF Level 3 Validation Report [D2] and in Section 1.2 in the ROM SAF ICDR Validation Report [D3].
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.
