...
Table 1: Definition of processing levels
Processing level | Definition |
Level-1b | The full-resolution geolocated radiometric measurements (for each view and each channel), rebinned onto a regular spatial grid. |
Level-2 (L2) | Retrieved cloud variables at full input data resolution, thus with the same resolution and location as the sensor measurements (Level-1b). |
Level-3C (L3C) | Cloud properties of Level-2 orbits of one single sensor combined (averaged) on a global spatial grid. Both daily and monthly products provided through C3S are Level-3C. |
Table 2: Definition of various technical terms used in the document
Jargon | Definition |
Brokered product | The C3S Climate Data Store (CDS) provides both data produced specifically for C3S and so-called brokered products. The latter are existing products produced under an independent programme or project which are made available through the CDS. |
Climate Data Store (CDS) | The front-end and delivery mechanism for data made available through C3S. |
Retrieval | A numerical data analysis scheme which uses some form of mathematical inversion to derive physical properties from some form of measurement. In this case, the derivation of cloud properties from satellite measured radiances. |
Forward model | A deterministic model which predicts the measurements made of a system, given its physical properties. The forward model is the function which is mathematically inverted by a retrieval scheme. In this case, the forward model predicts the radiances measured by a satellite instrument as a function of atmospheric and surface state, and cloud properties. |
TCDR | It is a consistently-processed time series of a geophysical variable of sufficient length and quality. |
ICDR | An Interim Climate Data Record (ICDR) denotes an extension of TCDR, processed with a processing system as consistent as possible to the generation of TCDR. |
CDR | A Climate Data Record (CDR) is defined as a time series of measurements with sufficient length, consistency, and continuity to determine climate variability and change. |
Scope of the document
This document provides a description of the product validation results for the Climate Data record (CDR) of the Essential Climate Variable (ECV) Earth Radiation Budget. This CDR comprises inputs from two sources: (i) brokered products from the Cloud Climate Change Initiative (ESA's Cloud_cci), namely those coming from processing of the Advanced Along-Track Scanning Radiometer ((A)ATSR) data and (ii) those produced under this contract for the Climate Data Store, specifically those coming from processing of the Sea and Land Surface Temperature Radiometers (SLSTR).
...
Table 2-1: Summary of the TCDR and preliminary assessment of ICDR accuracy of the Earth Radiation Budget dataset.Anchor table2_1 table2_1
Product name | Accuracy for the TCDR [W/m²] | Accuracy for the ICDR – SLSTR-A [W/m²] | Accuracy for the ICDR – SLSTR-B [W/m²] | Accuracy for the ICDR – A+B [W/m²] |
Reflected Solar radiation Flux (RSF) | 5.72 | 3.80 | 4.19 | 4.63 |
Outgoing Longwave Radiation (OLR) | 1.72 | -0.97 | -1.32 | -1.03 |
2.1 TCDR validation with CERES satellite data
...
Table 4-1: GCOS targets for Earth Radiation Budget ECVs and CDR values.Anchor table4_1 table4_1
Product name | GCOS targets | Cloud_cci dataset | |
RSF | Frequency | Monthly (resolving diurnal cycle) | Cloud_cci products do not meet the requirement for resolving the diurnal cycle. |
Resolution | 100 km | Cloud_cci products exceed the spatial resolution. | |
Measurement uncertainty | 1 W/m² on global mean | Uncertainty: 5.72 W/m² | |
Stability | 0.3 W/m²/decade | -0.15 W/m²/decade (Validation with CERES) | |
OLR | Frequency | Monthly (resolving diurnal cycle) | Cloud_cci products do not meet the requirement for resolving the diurnal cycle. |
Resolution | 100 km | Cloud_cci products exceed the spatial resolution. | |
Measurement uncertainty | 1 W/m² on global mean | Uncertainty: 1.72 W/m² | |
Stability | 0.2 W/m²/decade | -0.52 W/m²/decade (Validation with CERES) |
Known limitations [From D1 table 7.1]:
...
| Info | ||
|---|---|---|
| ||
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. |
Related articles
| Content by Label | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|