Bilt the Netherlands March 12 2014 Results from the OMPS Nadir Instruments on Suomi NPP Satellite Richard McPeters NASA GSFC OMPS Sensor Views NM OMPS Sensor Views NP OMPS Sensor Views ID: 492338
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OMI Science Team Meeting KNMI, De Bilt, the Netherlands March 12, 2014
Results from the OMPS Nadir Instruments on
Suomi NPP Satellite
Richard McPetersNASA GSFCSlide2
OMPS Sensor Views
NMSlide3
OMPS Sensor Views
NPSlide4
OMPS Sensor Views
LPSlide5
Nadir Sensor Consists of a Mapper and a Co-Boresighted Profiler
Single pushbroom telescopeTwo grating spectrometersEach spectrometer has a 740x340 pixel CCD detector arrayBoth 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: 300-380
nm
@1 nm resolution
Nadir
profiler:
250-310 nm
@1 nm resolutionSlide6
OMPS Nadir Mapper StatusLaunched on
Suomi-NPP 28 Oct 2012 Data available from February 2012 to March 2014NOAA’s operational NM product http://www.class.noaa.govNASA science team’s research productCompatible with OMIUses the NASA v8 algorithmQuality consistent with OMIhttp://ozoneaq.gsfc.nasa.gov/ompsOzone ST & PEATESlide7
NASA product from NM - 1.4% offset due to use of
Brion-Daumont-Malicet ozone cross sectionsSlide8
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 FOVNM ozone map for February 21, 2013Slide9Slide10
The OMPS NM and OMI benefit each other
OMIOMPS NMSlide11
OMI reveals issues with OMPS calibration
Why does OMPS – OMI Ozonedifference switch sign over highsouthern latitudes?Dobson Units-8-7
-6-5-4-3-2-1012
345678Dobson UnitsSlide12
OMPS reflectivity (over snow/ice) too high
OMPSOMIPercent
-8-7-6-5-3-2-10
1234567-480
82
8486
889092
94
96
98
100
Percent
80
82
84
86
88
9
0
92
94
96
98
100
PercentSlide13
OMPS NP Product
NOAA’s operational NP product
Based on NASA V6 algorithmhttp://www.class.noaa.govNASA science team’s NP research productBased on NASA V8.6 algorithmCompatible with SBUV/2 long-term recordFormats consistenthttp://ozoneaq.gsfc.nasa.gov/ompsPressure (hPa)Dobson UnitsComparison of average OMPS NPresearch product profile to average MLS profile for 23 June, 2012
(-20 < Latitude < 20 degrees)Sum of MLS profile = 235.7 DUSum of OMPS profile = 236.7 DUSlide14
Comparison of the average OMPS limb profile with the average nadir profile for September 2013.Slide15
High energy particles in the South Atlantic Anomaly (SAA) affect imaging sensors.
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 3/5-6/2012252 nm radiance
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)Slide16
Ozone % difference – Nadir Profiler
vs NOAA 191.0 – 1.6 hPaSlide17
Ozone % difference – Nadir Profiler
vs NOAA 194.0 – 6.3 hPaSlide18
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 OMIOMPS data (NP & NM) will be used to extend ozone long-term ozone data recordsalgorithm consistent with heritage dataset should be used to process data (v9 for TOMS, OMI, and NPP NM)SAA anomaly affect NP measurement10-20% error neear 1 hPa<2% below 5 hPaNo effect on total column ozoneConclusions