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ROMS vs HF Radar vs Drifters in Lagrangian Frame?

ROMS vs HF Radar vs Drifters in Lagrangian Frame?. Meeting with Charles 10/21/08. What Carter & Satoshi think. Dong et al (in review) ROMS against observations including HF radar vs drifters In Eulerian Frame Agree within 10’s % of difference

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ROMS vs HF Radar vs Drifters in Lagrangian Frame?

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  1. ROMS vs HF Radar vs Driftersin Lagrangian Frame? • Meeting with Charles • 10/21/08

  2. What Carter & Satoshi think • Dong et al (in review) • ROMS against observations including HF radar vs drifters • In Eulerian Frame • Agree within 10’s % of difference • Can nearshore site connectivity be accurately predicted? • Lagrangian validations may be useful • (to convince people who do not believe in models)

  3. How to measure “accuracy” • In terms of mean or realizations? • Mean is more predictable • “True dispersal” = larval dispersal, pollutant spread, etc • Nearshore site connectivity • We need some metrics that work for all methods • Statistical measures? • e.g., residence time, PDFs, connectivity? • Gaps in coverage among them

  4. HF Radar Coverage • Ohlmann et al (2006) show its accuracy against drifters • Issues: limited coverage & “gaps” Year = 2007 Year = 2001

  5. Surface Drifter Coverage • Probably most accurately describe water parcel dispersals • Issues: spatio-temporal resolutions, not after 1999 Not many in the South of SCB

  6. ROMS Coverage • Best spatial & temporal resolution (1996 - 2003) • 2004 - 2008 depends on support for Charles (1995, 1994, …?) [ C ]

  7. Given gaps among observations & ROMS, • What do we do? • We don’t know yet • Let’s start with what we can do...

  8. Preliminary Results: Drifters vs ROMS

  9. Comparison with Lagrangian PDFs

  10. Q: What (how) should we do? • Q: How do we collaborate? • Up to Carter, Libe, Charles & Jim HF radar & drifters Carter& Libe ROMS Charles, Eileen & Jim Applications Dave & Satoshi Need more arrows here

  11. That’s it • Thanks...

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