# Presentation: 840972

## OMPS AlgorithmStatus

**Ernest Hilsenrath**
***Goddard Space Flight Center***
***NPP Science Team Meeting***
***Nov 4-6, 2003***
***Annapolis Maryland***

## Ozone Mapper Profiler Suite OMPS) 

**OMPS is three instruments with NASA and ESA heritage**
- TOMS, SBUV, SOLSE, OMI
- GOME OSIRIS, SCIAMACHY
**Each instrument employs a CCD for UV/VIS hyperspectral imaging**
- Nadir column ozone mapping
- Nadir profile
- Limb profile
**Total ozone algorithm developed using CrIS**

**Instrument System Contractors**

## Ozone IORD-II 4.1.6.2.4(accuracy, precision, stability)

- _Threshold_		       _ Objectives_

***Tougher than TOMS and SBUV***

## OMPS Objectives

**OMPS Objectives**

**Continue TOMS-SBUV/2 global total ozone**** **
**Ozone recovery will be slower (1⁄2) than the decrease detected to date (0.5%/year-column)**
**Numerical Weather Prediction**
**Assimilated GOME data used to predict 2002 Antarctic ozone hole**
**NCEP demonstrated and is implementing  total and profile ozone to improve weather forecasts**
**Naval weather forecast to include assimilated ozone profiles**
***OMPS is capable of additional CDR products***
**Tropospheric ozone**
**Aerosol distribution and characteristics**
**UV irradiance and surface reflectivity**

## OMPS end to end Processing(S. Bennett – BATC)

**OMPS end to end Processing****(S. Bennett – BATC)**

**SDR Processing**

**EDR Processing**

**NPOESS**

- Calibration

- SDR formation

- Instrument Calibration Determination

**OMPS Sensor**

- Earth view RDR

- SDR Trending

- Scene or solar Radiance

- Ozone Retrieval

- Calibration RDR

## Algorithm Status

**Ball/Raytheon responsible for development of RDR, SDR, EDR algorithms**
- Rely on TOMS, SBUV/2 SOLSE heritage algorithms
- Four algorithms “delivered”
- Total column (TOMS)
- Nadir profile (SBUV/2)
- Limb profile (SOLSE
- CrIS IR Total column (AIRS)
**Ozone OAT – NASA, NOAA, NRL, U of Md have provided advice to IPO since 1997:  Down select, hardware, R/T- algorithm, and Cal/Val**
**Will not discuss RDR and SDR algorithms – *****CCDs were significant enhancements over heritage, but added new challenges***

## Total ozone mapping algorithm

**TOMS heritage with improvements needed to meet EDR accuracy and precision**
- Takes advantage of multiple wavelengths
- Multiple scattering tables
- Non-homogeneous scenes (VIIRS)
- Cloud fraction and top pressure (VIIRS)
- Ozone profile shape (improved climatology)
- Tropospheric ozone (improved climatology)
- Improved aerosol corrections
**Self consistency checks for “soft” validation**
**Performance meets requirements**
**ATBD posted on IPO website**
**Science code delivered to NGST Dec 2002**
**Some problems uncovered; will be fixed**

## Nadir Profile Algorithm

**Primarily adaptation of NASA vs 6 ozone profile algorithm  **
**Makes use of hyperspectral capability**
**Requires Mapper total ozone**
**Has slightly better SNR than heritage SBUV/2**
**Performance meets requirements**
**ATBD posted on IPO website**
**Science code delivered to NGST Dec 2002**
**Some problems uncovered; will be fixed**
**EOL SNR at shortest wavelength “issue of the day”**
**NASA produced vs 8 ozone profile algorithm:**
- Better climatology (O3, temp, aerosols)
- Better RT
- Better internal (soft) calibration
**No plans to put in SSPR baseline**

## IR Total Ozone Algorithm (CrIS)

**AER selected with BATC to provide TC ozone for night-time coverage, polar night, SAA**
**Heritage IRIS, TOVS, AIRS show feasibility**
**Four bands using 1305 CrIS channels**
**Performance meets requirements - most of the time**
**Algorithm science code delivered:  ATBD posted on IPO website**
**Test with AIRS observations highly desirable**
**NGST Position:**
- No contractual requirements found regarding TC-IR EDR algorithms.   BATC contract CWBS shows a P3I product with no specs.
- Next step currently being pursued.
- Briefing to NGST management is in preparation
**IPO Position:  NGST must accept and implement BATC deliverables**

## Limb Profile Algorithm

**Limb scattering heritage: SOLSE, SCIAMACHY, OSIRIS**
**Coverage similar to SBUV/2**
**Vertical resolution can meet 3 km EDR**
**Several major challenges still unresolved:**
- Surface inhomogeneity – more R/T modeling
- LOS ozone inhomgeneity - Tomography
- Aerosols complications – requires retrievals
- Latency issues – to account for corrections
- Pointing errors – accuracy sensitive
**More tests with heritage data needed**
**Profile EDR not met**
**Some SDR problems**
**EDR science code not integrated or tested**
***Further government investments likely***