Contributors: Hans Gleisner (DMI)
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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.
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.
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.
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].
This section is not applicable.
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 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].