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Table 2‑3: Comparison of the GRM TCDR target requirements for specific humidity with the GCOS target requirement.Anchor table2_3 table2_3
Requirement | GCOS (Target) | GRM TCDR |
Mean error | < 5% | <3% |
2.1.3 Data format and content issues
This dataset provides monthly mean values of specific humidity in the troposphere, below an altitude of 12 km. The data are provided as monthly netCDF files containing the specific humidity on a global latitude-altitude grid as well as the monthly variability, and associated variables such as data numbers, sampling errors, and an estimate of the fraction of a priori (background model) information in the humidity data.
However, unlike the TCDR, which is generated in a reprocessing activity, the ICDR is regularly updated, currently on a quarterly basis. ICDR data up to August 2022 are currently available in the Climate Data Store.
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2.3.1 Discussion of requirements with respect to GCOS and other requirements
The validation relies on analysing results from comparisons to various satellite, reanalysis, ground-based and in situ data records. Global comparisons were carried out against AIRS, ERA5 and GOME Evolution (see Table 2-5). It was demonstrated that the combined global TCWV data record frequently meet the GCOS target requirements. Relative to AIRS (chosen as the basis for target requirements) mean bias and stability are 0.47 kg/m2 (2.5%) and 0.08 kg/m2/decade (0.5%), respectively (Section 7 in [D2]). Separate results for land and ocean only coverages and more details are given in the Validation Report [D2].
Table 2‑5: Global comparison of the Water Vapour TCWV WV_cci/CM SAF (COMBI) TCDR v1.0 validation results (where AIRS results, chosen as the target requirement, are marked in bold) with the GCOS target requirement. Marked in green is where the mean error and stability values fulfills the GCOS requirements.Anchor table2_5 table2_5
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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 and Contribution Agreement signed on 22/07/2021). 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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