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

• Can nearshore site connectivity be accurately predicted?

Lagrangian validations may be useful

(to convince people who do not believe in models)

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

HF Radar Coverage

• Ohlmann et al (2006) show its accuracy against drifters

Issues: limited coverage & “gaps”

QuickTime™ and a decompressor

are needed to see this picture.

Year = 2007

QuickTime™ and a decompressor

are needed to see this picture.

Year = 2001

Surface Drifter Coverage

• Probably most accurately describe water parcel dispersals

Issues: spatio-temporal resolutions, not after 1999

Not many in the South of SCB

ROMS Coverage

• Best spatial & temporal resolution (1996 - 2003)

2004 - 2008 depends on support for Charles

[ C ]

(1995, 1994, …?)

Given gaps among observations & ROMS,

• What do we do?

We don’t know yet

Let’s start with what we can do...

Preliminary Results: Drifters vs ROMS

Comparison with Lagrangian PDFs

Q: What (how) should we do?

• Q: How do we collaborate?

Up to Carter, Libe, Charles & Jim

HF radar & driftersHF radar & drifters

Carter& LibeCarter& Libe

ROMSROMS

Charles, Eileen & JimCharles, Eileen & Jim

ApplicationsApplications

Dave & SatoshiDave & SatoshiNeed more arrows here

That’s it

• Thanks...