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Analyzing JMR Wet Path Delays: ECMWF Model Comparison

Explore findings from the Jason-1 Science Working Team Meeting on JMR path delays, ECMWF model stability, and comparison with GPS observations and other methods. Discover potential geographically correlated errors and attitude dependence in wet PD corrections.

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Analyzing JMR Wet Path Delays: ECMWF Model Comparison

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  1. Monitoring the JMR Wet Path Delays Shailen Desai Bruce Haines Victor Zlotnicki

  2. JMR versus ECMWF • +3-4 mm step between cycles 29-32 • -5 mm step at cycle 2 caused by change to ECMWF model Jason-1 Science Working Team Meeting Cal/Val Splinter Session

  3. Comparisons to GPS observations • Similar +4-5 mm step in JMR path delays found in comparisons to GPS. • ECMWF model relatively stable in comparison. • Smaller scatter after cycle 36 when ECMWF model modified. • Smaller scatter in (JMR-ECMWF) differences (from 1.5 to 1.25 cm). Jason-1 Science Working Team Meeting Cal/Val Splinter Session

  4. Comparison to SSM/I and TMI Jason-1 Science Working Team Meeting Cal/Val Splinter Session

  5. Attitude Dependence • Attitude dependence of JMR wet PD correction may have returned after cycle 33. • Verification by other methods pending (e.g. SSM/I and TMI). Jason-1 Science Working Team Meeting Cal/Val Splinter Session

  6. Geographically Correlated Error? Cycles 2-27 • Comparisons to SSM/I and TMI suggest possible geographically correlated errors in JMR wet PD. • Color scale is from -9 to +9 mm. Cycles 29-59 Jason-1 Science Working Team Meeting Cal/Val Splinter Session

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