1. OMI Total Column Ozone compared with the Suomi NPP OMPS Mapper OMI Science Team Meeting, De Bilt, Netherlands 31 August – 2 September, 2015 Richard McPeters NASA GSFC

2. The comparison:  NPP OMPS Nadir Mapper Ozone version 8 TOMS algorithm (317 – 340 nm) uses Brion – Daumont - Malicet ozone cross sections (ozone ~ 1.5% higher than using BP) uses cloud height climatology from OMI  OMITOMS version 8.5 Ozone version 8.5 TOMS algorithm (317 – 340 nm) uses Bass and Paur ozone cross sections cloud height derived for each FOV instrument calibration very stable  compare with SBUV Merged Ozone dataset and with NOAA 19 SBUV/2 to evaluate long term stability

3. OMI long term versus SBUV

4. OMI agrees with NOAA 19 SBUV/2 with half a percent offset 60°S – 60°N

5. The NPP total column mapper has a larger offset relative to OMI

6. The NPP profiler ozone is 2% higher than OMI

7. The southern hemisphere NPP profiler has ~1% annual cycle relative to OMI

8. Conclusions ► OMI is very stable relative to the v8.6 SBUV time series ► The NPP mapper and nadir profiler are stable relative to OMI  total column mapper ~1.5% high relative to OMI  Nadir profiler ~2% high relative to OMI ► The NPP OMPS nadir profiler has significant seasonal dependence in both hemispheres ► Version 2 processing is underway for both NPP mapper and profiler Coming attractions ….

10. DSCOVR-EPIC (Earth Polychromatic Imaging Camera) A 10 channel filter imager: 317.5 nm – ozone, SO 2 551 nmaerosols, vegetation 325ozone680O 2 B band reference 340ozone, aerosols688O 2 B band cloud ht 388aerosols, clouds764O 2 A band cloud ht 443aerosols780O 2 A band reference From the L1 Lagrange point EPIC views the entire sunlit Earth

11. “blue marble” EPIC image taken in July 2015 (~10 km resolution)

12. 779 nm Reference O 2 A-band showing sensitivity to cloud height Weakly Attenuated

13. O 2 A-band showing sensitivity to cloud height Strongly absorbed by O 2 764 nm O2 A-band

14. 688 nm June 18 Cloud height Index = Ratio (764nm/779nm) O 2 A-Band 764nm Cloud Height Index Cloud Height Index Estimated from Oxygen A-Band

15. Lunar Transit with Music