Plot Description

Data Quality: Description


Product Service Specifications

The graphs show with a color code whether different product specifications have been violated during a given month and altitude interval, for a given variable and satellite mission. If an area is hatched it means that the service specifications for the variable where violated on average during the corresponding period. The profiles are divided into latitudinal zones: tropics (30° S-30° N), mid-latitudes (30° S-60° S and 30° N-60° N), and polar regions (60° S-90° S and 60° N-90° N). Each zone is further separated into height layers.

Compliance with specifications

For each variable and day we calculate the STD as follows: (i) for Refractivity of the "observation - background", (ii) for 1D-Var products of the "solution - ECMWF analysis". If this STD value exceeds the specification, the color code for that violation is used for the whole month.

Product requirements and service specifications

The requirements are summarized in the Validation Reports. Three accuracy levels are specified: threshold, target, and optimal. The color codes seen in the color bar indicate that the given requirements are met, i.e., not violated; e.g., the color yellow means that threshold level is met but the target level has been violated.

Time series (vertical mean plots)

These plots show the daily mean value of (O-B)/B departures from ECMWF forecasts over a given vertical domain as a function of time, as well as the nominal occultation count (all that passed the QC screening). Bias should be understood as the mean value of the absolute value of the bias. The occultation count refers to the number of profiles that fully or partly covered the given domain. The red-dashed lines indicate the service specification values.

Time series (Hovmöller plots)

These plots show daily STD's of the chosen variable, satellite and area. The plots include all data from the selected RO mission that passed the QC screening (i.e. are nominal). The Hovmöller plots are overlayed with contours enclosing areas where requirements or specifications are violated. The requirements and specifications are summarized in the Validation Reports.

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Product Quality Assessment


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