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The GeoTASO IIP Project

The GeoTASO IIP Project. Jim Leitch Ball Aerospace jleitch@ball.com 303-939-5280. GeoTASO Will Bridge the STM to Sensor/Algorithm Requirements Gap. Project goals: Demonstrate a compact sensor configuration for a UV-Vis spectrometer Test spectral parameter dependence of retrievals

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The GeoTASO IIP Project

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  1. The GeoTASOIIP Project Jim Leitch Ball Aerospace jleitch@ball.com 303-939-5280

  2. GeoTASO Will Bridge the STM to Sensor/Algorithm Requirements Gap Project goals: • Demonstrate a compact sensor configuration for a UV-Vis spectrometer • Test spectral parameter dependence of retrievals • Collect real scene data from an airborne platform and test retrievals Project draws from previous ESTO-funded work on spectrometers (GeoSpec) and depolarizers (PolZero) and from retrieval studies GeoSpec IIP Time Domain Depolarizer ACT

  3. GeoTASO Team • Ball Aerospace • Jim Leitch, Principal Investigator • Tom Delker, Sensor Technical Lead • Bill Good, Airborne Measurements • NASA/GSFC • Scott Janz, Instrument Requirements, Sensor Advisor • Ken Pickering, Science Requirements, Campaigns • Nick Krotkov, Science Requirements • Harvard/SAO • Kelly Chance, Trace Gas Retrievals, Instrument Requirements • Xiong Liu, Ozone Retrievals, Instrument Requirements • U Nebraska • Jun Wang, Aerosol Retrievals, Science Requirements GeoCAPE Science Team Sensor Params Performance Predicts GeoTASO Sensor Ball, GSFC Rqmnts GeoTASO Algorithms SAO, GSFC, UNeb Data

  4. GeoTASO Sensor: Multi-order Offner Spectrometer • Spectrometer • Multiple diffraction orders from grating • Orders are spatially overlapped • Dichroic split of two spectral ranges • Dichroicbeamsplitter and filters for detectors are critical components • Strawman design covers 290-510nm spectral range • Overlapping diffraction orders keep spectrometer small Ball Aerospace & Technologies Corp. Proprietary Information

  5. Trade Space and Spectral Parameters Multi-order spectrometer options • Can extend spectral coverage if passbands relaxed • Change in coverage moves split between channels • Bounding cases given here are at 3 samples per passbandFWHM Selectable Spectral Sampling/Passband • Replaceable slit allows change of spectral parameters • Gives data for retrieval tests using several passband/sampling combinations

  6. Trace Gas and Aerosol Retrieval Tests • Verification of algorithm sensitivity studies • Retrieval dependence on spectral sampling, SNR, spectral passband • Test of retrievals using real scene data • High spatial scale and spectral scale data to be used • Comparison with space-based measurements using underflights of OMI • Sensor FOV matches OMI footprint • Tests of spatial scale effects from oversampled OMI footprint • Tests of algorithm approaches and fitting details • Optimal estimation versus nonlinear least-squares fitting of AMF-normalized reference spectra • Aerosol and cloud interference • Albedo variation at visible wavelengths

  7. Project Timeline and Planned Activities • Start Date: May 2011 (Kickoff held 10 May 2011) • Year 1: Requirements, Design, Procurements/Fabrication • Year 2: Assembly/Alignment, Lab Tests, Calibration, Algorithm Prep • Year 3: Flight Campaigns, Retrievals

  8. GeoTASO Project Summary • Project start this week • Initial trades and requirements work based on STM, algorithm sensitivity studies • Compact, 2-channel spectrometer may offer lower mass approach for space sensor

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