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Status of SSM/I and SSMIS FCDR Project

This project aims to create a documented Fundamental Climate Data Record of SSM/I and SSMIS brightness temperatures from 1987 to present, ensuring data accuracy and ongoing corrections. Multiple intercalibration approaches will be developed with user feedback, enhancing product quality and stewardship. Observation data will be stored in self-describing formats. The project addresses various issues in SSMIS TDR data, such as duplicated scans, ephemeris accuracy, and calibration challenges.

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Status of SSM/I and SSMIS FCDR Project

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  1. Status of SSM/I and SSMIS FCDR Project Matt Sapiano, Wesley Berg, Christian Kumerow, and FuhzongWeng Colorado State University

  2. NOAA SDS Project: An FCDR of SSM/I and SSMIS TBs • Generate a transparent and documented Fundamental Climate Data Record (FCDR) of SSM/I and SSMIS brightness temperatures from 1987 – Present. • Obtain all data (including correct epehemeris & geolocation/EIA) and apply necessary corrections • Expect that this will be an ongoing process after initial period of activity (not exactly real-time, but close) • Develop/implement multiple approaches for intercalibration and then identify and apply the best approach in the stewardship code to produce FCDR. • Work closely with user community to obtain best possible product as well as an assessment of this product.

  3. Stewardship Code Base Files FCDR Files Ta to Tb Inter-calibration Cross Track Bias Correction Geolocation QC Base files & stewardship code • Base Files contain rawest form of observations available • Antenna temperatures along with all relevant satellite and sensor data. • Base files are broken/combined into single orbit granules starting at the ascending node crossing point of the spacecraft. • Eliminates duplicate scans and simplifies subsequent processing. • Nothing is deleted or modified from TDRs except duplicate scans. • Two line element files are used to define granule start/end times and to compute spacecraft ephemeris for creating updating/improved pixel geolocation. • Data is stored in a self describing format such as NetCDF or HDF. • File contents are sensor dependent

  4. Sample Fundamental Climate Data Record (FCDR) Specification Header Data

  5. Status of SSM/I and SSMIS • SSM/I • Data availability -> Archive complete (F08, F10, F11, F13, F14, and F15) • Base files -> Beta 1.0 complete • Stewardship code -> Beta 1.0 working • FCDR files -> Beta 1.0 working • SSMIS • Data availability -> Complete NCDC archive (F16, F17, and F18) • Base files -> Have preliminary F16 files • Stewardship code -> In progress (UPP corrections needed) • FCDR files -> In progress

  6. Duplicate scans

  7. Duplicate scans

  8. Pre-operational data issues Incorrect time tag (jday is off by 1 day)

  9. Predicted vs. Computed Spacecraft Ephemeris Computed values derived from SGP4 NASA/NORAD code.

  10. SSMIS TDR Issues • Use of predicted spacecraft ephemeris for pixel geolocation? • Spacecraft ephemeris not reported for scan times. • Significant number of duplicate scans • Big impact on Climate data • Format changes from Software Revision 4 to 5 • Does anyone have the rev 4 format specification? • Calibration issues • Interference (i.e cross-track biases) • Emissive antenna? • APC (TA to TB)?

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