## 3 Science Data Product Performance
### The Ozone Mapping and Profiler Suite (OMPS) Instrument and Science Data Products  
The S-NPP OMPS has three instruments, the Nadir Mapper (OMPS-NM), Nadir Profiler (OMPS-NP), and Limb Profiler (OMPS-LP) that measures scattered solar UV and visible radiance to derive three dimensional distributions of ozone and other atmospheric constituents for daily monitoring. The OMPS Version 8 algorithms for Total Ozone (V8 TOz from OMPS-NM) and Ozone Profile (V8 Pro from OMPS-NP) have the heritage of the Solar Backscatter Ultra Violet (SBUV) algorithms [(99)]. The OMPS-LP ozone product algorithm is based on a scattering retrieval technique used for the Shuttle Ozone Limb Sounding experiment [(100)]. The NM instrument provides total column ozone (TC), UV absorbing aerosol index (UVAI), and total column SO\({}_{2}\) at 50 \(\times\) 50 km\({}^{2}\) horizontal resolution at nadir from S-NPP with 2% accuracy. Starting with NOAA-20, these products \begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Product** & \multicolumn{2}{c}{**Requirement**} & \multicolumn{2}{c}{**Performance**} \\ \hline Snow cover & & & & \\ Probability of detection (\%) & & 80 & & 54 \\ Snowfall detection & & 40 & & 51 \\ Probability of detection & Accuracy & Precision & Accuracy & Precision \\ Snowfall rate (mm/h) & 0.3 & 1.0 & 0.06 & \\ Snow water equivalent (cm) & 3.0 & 6.0 & \(-\)1.2–2.0 & 2.1–4.2 \\ Sea ice concentration (\%) & 10 & 25 & 2–10 & 10–20 \\ Cloud liquid water (mm) & 0.03 & 0.08 & 0.003–0.009 & 0.07 \\ Land surface emissivity (\%) & & & & \\
23.8 GHz & 2.0 & 3.0 & 0.0–0.4 & 2.0–2.3 \\
50.3 GHz & 1.5 & 3.0 & 0.1–0.6 & 2.7–3.0 \\
165.5 GHz & 1.5 & 4.0 & 0.1–0.7 & 3.0–3.8 \\ Land surface temperature * & 4 K & 7K & \(-\)1.84 K & 5.26 K \\ Total precipitable water (mm) & & & & \\ Sea clear & 1.5 & 2.5 & 1.3 & 1.8 \\ Sea cloudy & 0.5 & 2.5 & 0.2 & 1.9 \\ Sea-ice clear/cloudy & 2.0 & 2.0 & \(-\)0.5 & 1.6 \\ Land clear /cloudy & 2.5 & 5.5 & \(-\)0.5 & 4.8 \\ Snow clear/cloudy & 0.5 & 2.0 & \(-\)0.2 & 0.8 \\ Rainfall rate (mm/h) & & & & \\ Sea & 0.10 & 1.0 & 0.08 & 1.0 \\ Land & 0.05 & 1.5 & 0.01 & 0.8 \\ \hline \hline \end{tabular}  
* List performance uncertainty and requirement (shown in parenthesis): 5.58 (8.0) K.  
\end{table} 
Table 13: S-NPP MiRS products performance. \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Product** & \multicolumn{2}{c}{**Sea Clear**} & \multicolumn{2}{c}{**Sea Cloudy**} & \multicolumn{2}{c}{**Land Clear/Cloudy**} \\ \hline Temperature & & & & & \\ Profile & Accuracy (K) & Precision (K) & Accuracy (K) & Precision (K) & Accuracy (K) & Precision (K) \\
100 hPa & \(-\)0.2 (0.2) & 1.7 (2.0) & 0.0 (0.8) & 1.9 (2.0) & \(-\)0.5 (0.5) & 1.5 (2.0) \\
300 hPa & 0.6 (0.5) & 1.5 (2.0) & 0.4 (0.8) & 1.9 (2.5) & 0.8 (0.8)will be produced at 17 \(\times\) 17 km\({}^{2}\) resolution at nadir. The NP instrument produces middle and upper stratosphere ozone profiles in the orbital track at 250 \(\times\) 250 km\({}^{2}\) (50 \(\times\) 250 km\({}^{2}\) from NOAA-20) resolution with 5% accuracy and 5 to 10 km vertical resolution in the middle and upper stratosphere. The Limb Profiler (LP) currently on S-NPP (and in the future on JPSS-2) provides a high vertical resolution stratospheric ozone product at 5% accuracy and 3 km vertical resolution in the stratosphere. The OMPS-NM total column ozone products have been compared with similar products from ground-based and satellite-based instruments [101], as shown by the comparisons between S-NPP OMPS-NM (NOAA Version 8 algorithm), MetOp-A/B Global Ozone Monitoring Experiment-2 (GOME-2, NOAA Version 8 algorithm), and NASA EOS Aura Ozone Monitoring Instrument (OMI, NASA Version 8.6 algorithm) in Figure 14. The JSTAR ozone teams currently produce daily-, global- and regional-scale TC, UVAI and SO\({}_{2}\) products and support UV index forecasts and hazard warning systems in place of OMI (SO\({}_{2}\)) [102].