ROAM – IMOS comparisons

David Griffin | Madeleine Cahill | Peter Oke Gary Carroll | Uwe Rosebrock CSIRO Marine and Atmospheric Research

David Griffin

Evaluation of ROAM surface currentsusing IMOS data• HF radar system off Perth – only instrument to provide maps of

current velocity right near the surface, out to ~100km depending on radar range at the time• Look at this first, then briefly also:• ADCPs off Townsville (more regular in time, all depths below ~12%

of water depth, isolated locations).

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David Griffin3 |

David Griffin

Lets look at time series of u and v at these 5 points

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David Griffin

Agreement (V component) fairly good, especially phase of inertial oscillations

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David Griffin

Eastward velocity component (u) also OK

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David Griffin

Different run (slightly bigger domain): more disagreement

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David Griffin

Especially for V (northward velocity)

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David Griffin

Larger domain: needs data assimilation (not used for this run, will do soon)

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David Griffin

Off Townsville, daily averages at 20m, fair qualitative agreement

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David Griffin

Tides also good. Roll eddy imaginary?

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David Griffin

Thankyou. Sorry I couldn’t make it.

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