I have been wondering what would be the best strategy to assimilate moored ADCP and current meter data. In my particular case, I have several moorings (approx. 30) scattered through a regional domain. M2 and K1 internal tides are important in a portion of the domain.
Usually, the uv data is lowpass filtered before assimilation (lets say 48h cut freq.). However, this eliminates any improvement the assimilation can have on the representation of high frequency processes. My experience with HF Radars showed that assimilating data with 2h resolution can reduce phase errors for both internal and barotropic tides.
I wonder if someone else have been assimilating high frequency currents in regional ocean models.
I am using ROMS with strong constraint 4DVar.
Thank you Guillermo.
In this paper they assimilate data from an on-board ADCP. The data is "averaged" to remove small scale features not represented by the model.
My case, however, is a little different since the ADCP is moored.
The model is able to reproduce the high frequency I am interested on. Given the processed data is provided hourly, there should not be any "mandatory" a priori filtering for the assimilation...
Dear Joao Marco,
You may also consult this paper available on my research gate account concerning the assimilation of current in a (quasi) PE model.
Giordani, H., G. Caniaux, and L. Prieur, 2005: A simplified 3D
oceanic model assimilating geostrophic currents: application to the
POMME experiment. J. Phys. Oceanogr., 35, 5, 628-644.
We had quite nice results with the technique employed,
Best regards, G.C.
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