SAGE III/ISS Future Algorithm Development and Improvements
Priorities for future algorithm development beyond Version 5.2 include scrubbing and standardizing code, incorporating DMP data for better pointing knowledge, and addressing known deficiencies like transmission binning and refraction issues. Improvements aim to provide consistent solutions for O3, NO2, and aerosols in the visible spectrum, explore different solution approaches, and implement various enhancements such as pressure-broadening corrections and ancillary aerosol products. Additionally, temperature and pressure research products from SAGE III/ISS focus on retrieving accurate profiles using multi-spectral measurements of the O2 A-band absorption feature, with ongoing efforts to refine wavelength registration and enhance data fidelity.
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Presentation Transcript
SAGE III/ISS Future Algorithm Development Rob Damadeo & Dave Flittner
Priorities for Version Beyond 5.2 General algorithm scrub to flush out remaining surprises in the inherited code Make it Version 7 (i.e., standardize across platforms to extent possible and reasonable) Single ozone profile from visible channels Incorporate DMP data for better pointing knowledge and to mitigate anomalous influences Pointing Knowledge is Critical! Advancements realized from this set could be folded into V5.2, if it makes sense October 29-30, 2019 2
Beyond 5.2: Known Deficiencies Known/Suspected Deficiencies / Problems Is transmission binned properly? DMP rate data isn t utilized Definition of Sun size I0 (aka I-zero) uncertainties are not incorporated Is refraction done correctly? Optimize? NO2 appears biased high October 29-30, 2019 3
Beyond 5.2: Improvements Improvements Consistent solution for O3, NO2 and aerosol in visible spectrum OZONE_MLR does this but not the way it was originally envisioned Exploring several different solution approaches Pressure-broadening correction for NO2 cross-sections? H2O (right combination of channels) Mesospheric O3 (stray light correction, channel usage) Optical Depth (OD) thresholds for stopping retrieval Temperature/Pressure (T/P) implementation Incorporate ancillary aerosol products (e.g., SAD or Reff) Cloud flagging October 29-30, 2019 4
SAGE III/ISS Temperature and Pressure Research Products Composite of 15 Sunset Events on 2017-11-14 (~27.5o S) Strategy SAGE III/ISS retrieves profiles of T/p from multi- spectral measurements of the O2 A-band absorption feature near 762 nm T/p products from the METEOR/3M mission were of limited science value due to instrument issues Preliminary assessment: SAGE III/ISS O2 A-band measurements are of higher fidelity than SAGE III/Meteor 3-M s with no apparent instrument issues Sensitivity tests indicate an apparent small wavelength shift in A-band channels relative to nominal registration (approximately 0.03-0.04 nm for sunset and 0.04-0.05 nm for sunrise) Preliminary retrievals look encouraging with near science quality products, but some issues remain Past year spent addressing computer hardware issues affecting S/W T MERRA-2 SAGE III/ISS, K Future work: Refine wavelength registration Examine sensitivity to forward model parameters Bandpass (width, wings, etc.) Spectroscopy (line intensities, line shape) Solar spectrum Exclude weaker channels and/or solar feature October 29-30, 2019 5
Lunar and Limb Focus so far has been on solar Lunar Similar algorithm scrub to look for areas to improve Are we fundamentally limited by SNR or algorithm? Limb: Looking to implement Level 1B product Community supported effort to develop L2 products February 16, 2025 6
Questions? February 16, 2025 7
Solar Algorithm Breakdown Ephemeris Mostly SDP Toolkit routines Meteorological Processing MERRA-2 Reanalysis Refraction Fairly straightforward but slightly different from SAGE II Transmission The meat of the algorithm; also the trickiest Inversion Fairly straightforward with good transmission profiles February 16, 2025 8
