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The OMPS Limb Profiler Instrument: An Alternative Data Analysis and Retrieval AlgorithmThe upcoming Ozone Mapper and Profiler Suite (OMPS), which will be launched on the NPOESS Preparatory Project (NPP) platform in early 2011, will continue monitoring the global distribution of the Earth's middle atmosphere ozone and aerosol. OMPS is composed of three instruments, namely the Total Column Mapper (heritage: TOMS, OMI), the Nadir Profiler (heritage: SBUV) and the Limb Profiler (heritage: SOLSE/LORE, OSIRIS, SCIAMACHY, SAGE III). The ultimate goal of the mission is to better understand and quantify the rate of stratospheric ozone recovery. The focus of the paper will be on the Limb Profiler (LP) instrument. The LP instrument will measure the Earth fs limb radiance (which is due to the scattering of solar photons by air molecules, aerosol and Earth surface) in the ultra-violet (UV), visible and near infrared, from 285 to 1000 nm. The LP simultaneously images the whole vertical extent of the Earth's limb through three vertical slits, each covering a vertical tangent height range of 100 km and each horizontally spaced by 250 km in the cross-track direction. The focal plane of the LP spectrometer is a two ]dimensional CCD array comprised of 340 x 740 pixels. Several data analysis tools are presently being constructed and tested to retrieve ozone and aerosol vertical distribution from limb radiance measurements. The primary NASA algorithm is based on earlier algorithms developed for the SOLSE/LORE and SAGE III limb scatter missions. The paper will describe an alternative algorithm which will retrieve ozone density and aerosol extinction directly from radiance data collected on individual CCD pixels. This alternative method uses an optimal estimation approach to retrieve ozone and aerosol in the 10-60 km range from the information contained within an ensemble of about 50000 down-linked pixels. Tangent height registration is performed using the Rayleigh Scattering Attitude Sensor (RSAS) technique applied to columns of pixels in the 340-360 nm range. Cloud height is determined by analyzing the radiance first derivative along pixel columns at longer wavelengths. Wavelength registration is performed using rows of pixels and identifying Fraunhofer solar lines within the measured spectra. Special attention is given to stray-light decontamination and modeling of the measured finite spectral/spatial line shape functions.
Document ID
20100025709
Acquisition Source
Langley Research Center
Document Type
Conference Paper
Authors
Rault, Didier F.
(NASA Langley Research Center Hampton, VA, United States)
Lumpe, Jerry
(Computational Physics, Inc. United States)
Eden, Thomas
(Computational Physics, Inc. United States)
Date Acquired
August 24, 2013
Publication Date
August 31, 2009
Subject Category
Meteorology And Climatology
Report/Patent Number
LF99-8833
Meeting Information
Meeting: SPIE Europe Remote Sensing 2009
Location: Berlin, Germany
Country: Germany
Start Date: August 31, 2009
Sponsors: International Society for Optical Engineering
Funding Number(s)
WBS: WBS 437949.02.01.01.18 SCEX
Distribution Limits
Public
Copyright
Other

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