1. Results from the OMPS Nadir Instruments on Suomi NPP Satellite
Richard McPeters
NASA GSFC
OMI Science Team Meeting KNMI, De Bilt, the Netherlands March 12, 2014

2. OMPS Sensor Views
OMPS consists of suite and ground processing algorithms
Two sensors, Limb and Nadir, provide Limb Profile, Nadir Total Column, and
Nadir Profile Raw Data Records
Main Electronics Boxes provide data processing, provide spacecraft electrical interfaces, and controls on-orbit operations
SDR and EDR algorithms process RDRs into SDR and EDR products
110° nadir cross-track field of view (FOV) and 3 limb FOVs provide required coverage
2.23° limb vertical FOV provides sampling from tropopause to 60 km NM

3. OMPS Sensor Views
OMPS consists of suite and ground processing algorithms
Two sensors, Limb and Nadir, provide Limb Profile, Nadir Total Column, and
Nadir Profile Raw Data Records
Main Electronics Boxes provide data processing, provide spacecraft electrical interfaces, and controls on-orbit operations
SDR and EDR algorithms process RDRs into SDR and EDR products
110° nadir cross-track field of view (FOV) and 3 limb FOVs provide required coverage
2.23° limb vertical FOV provides sampling from tropopause to 60 km NP

4. OMPS Sensor Views LP
OMPS consists of suite and ground processing algorithms
Two sensors, Limb and Nadir, provide Limb Profile, Nadir Total Column, and
Nadir Profile Raw Data Records
Main Electronics Boxes provide data processing, provide spacecraft electrical interfaces, and controls on-orbit operations
SDR and EDR algorithms process RDRs into SDR and EDR products
110° nadir cross-track field of view (FOV) and 3 limb FOVs provide required coverage
2.23° limb vertical FOV provides sampling from tropopause to 60 km

5. Nadir Sensor Consists of a Mapper and a Co-Boresighted Profiler
Single pushbroom telescope
Two grating spectrometers
Each spectrometer has a 740x340 pixel CCD detector array
Both sample spectrum at 0.42 nm, 1 nm FWHM end-to-end resolution
Calibration stability maintained by periodic solar observations using dual reflective diffusers
Telescope
Total Column Spectrometer
Profile Spectrometer
Nadir total column mapper: nm resolution
Nadir profiler: nm @1 nm resolution
Note wavelength ranges

6. OMPS Nadir Mapper Status
Ozone ST & PEATE
Launched on Suomi-NPP
28 Oct 2012
Data available from February 2012 to March 2014
NOAA’s operational NM product
NASA science team’s research product
Compatible with OMI
Uses the NASA v8 algorithm
Quality consistent with OMI
Note 2 products

7. NASA product from NM - 1.4% offset due to use of Brion-Daumont-Malicet ozone cross sections

8. We propose to process NPP mapper data with PK’s v9 algorithm
NM ozone map for February 21, 2013
Map
We propose to process NPP mapper data with PK’s v9 algorithm
very similar accuracy to v8
accuracy better at high solar zenith angles
will include Joanna’s cloud height retrieval
will give error for each FOV

10. The OMPS NM and OMI benefit each other

11. OMI reveals issues with OMPS calibration
Why does OMPS – OMI Ozone
difference switch sign over high
southern latitudes?
This is an ozone difference plot -8 -7 -6 -5 -4 -3 -2 -1 1 2 3 4 5 6 7 8
Dobson Units
Dobson Units

12. OMPS reflectivity (over snow/ice) too high
OMI 80 82 84 86 88 90 92 94 96 98
100 80 82 84 86 88 90 92 94 96 98
100
Percent
Percent -8 -7 -6 -5 -4 -3 -2 -1 1 2 3 4 5 6 7
Percent

13. OMPS NP Product NOAA’s operational NP product
Pressure (hPa)
Dobson Units
Comparison of average OMPS NP
research product profile to average
MLS profile for 23 June, 2012
(-20 < Latitude < 20 degrees)
Sum of MLS profile = DU
Sum of OMPS profile = DU
NOAA’s operational NP product
Based on NASA V6 algorithm
NASA science team’s NP research product
Based on NASA V8.6 algorithm
Compatible with SBUV/2 long-term record
Formats consistent
Not e 2 products

14. Comparison of the average OMPS limb profile with the average nadir profile for September 2013.

15. Map of South Atlantic Anomaly effects on OMPS NM closed-door dark current measurements in December and November 2011, overlaid with OMPS NP SAA Flags (0 to 8) for 3/5-6/2012
High energy particles in the South Atlantic Anomaly (SAA) affect imaging sensors.
252 nm radiance
NP flags give the stripes
Radiance map C. Seftor, SSAI, Flag map Y. Hao, IMSG
Radiance Line Plots J. Niu, ERT
The noise / dark current increases when an orbital path falls with within the SAA, mainly affecting short wavelengths in the Nadir Profiler. (252 nm plotted)

16. Ozone % difference – Nadir Profiler vs NOAA 19
1.0 – 1.6 hPa
Compare profile from NOAA 19 SBUV/2 with the NP profile

17. Ozone % difference – Nadir Profiler vs NOAA 19
4.0 – 6.3 hPa

18. Conclusions
Performance of OMPS nadir NM & NP sensors is very good can be used to produce high quality ozone retrievals
“Soft calibration” needed, particularly at NM far off-nadir scenes
NASA research product ~1.5% higher than OMI
OMPS data (NP & NM) will be used to extend ozone long-term ozone data records
algorithm consistent with heritage dataset should be used to process data (v9 for TOMS, OMI, and NPP NM)
SAA anomaly affect NP measurement
10-20% error neear 1 hPa
<2% below 5 hPa
No effect on total column ozone