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NATL12

NATL12. Anne-Marie Treguier, Sébastien Theetten, Catherine Guiavarc’h, Bruno Levier Drakkar Team. Scientific objectives. Variability of the boundary currents (2007-2010)

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NATL12

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  1. NATL12 Anne-Marie Treguier, Sébastien Theetten, Catherine Guiavarc’h, Bruno Levier Drakkar Team Drakkar meeting - 25-26 January Grenoble

  2. Scientific objectives • Variability of the boundary currents (2007-2010)  2007Map the high-frequency variability of the currents on the continental slope in the Atlantic and understand what part of the energy is directly forced by the wind • Exchanges between the boundary current and the interior (2008-2010) • Mode water study (in the North-East Atlantic and in the subpolar gyre) Drakkar meeting - 25-26 January Grenoble

  3. Model configuration • Configuration similar to MERCATOR’s config, except: • NEMO V2 • 64 vertical levels • OB at the northen and southern boundaries • Forcing fields • A first very simple and light simulation (only analytical forcing) has run • It was made to figure out the calculation cost and behavior of this configuration on the new machine NEC-SX8. • 4 nodes of 8 procs = 32 procs • 1 year NATL12 costs about 500 cpu hours with 20 hours elasped • Work on the strategy for I/O, test of several solver, type of domain decomposition, ... Drakkar meeting - 25-26 January Grenoble

  4. High frequency outputs (Catherine Guiavarc'h) Daily outputs on the last level over the entire basin Daily outputs for “virtual” moorings implemented in the model on the continental slope Test output strategy with NATL4 and then move to NATL12 Data/model comparison. Data available after 1997  Forcing: ERA40 since 1992 with 5 year of spin up Examination of the intra-seasonal variability along the continental slope (see Gulf of Guinea figure) Workplan for 2007

  5. Map of the rms of the velocity Period 15 days – Deph 1150m • - GUINEA model (C. Guiavarc’h) • - Daily output • - 100 levels • OB • 1/12° resolution

  6. Open boundaries (B. Levier)  Do the OB improve the results ? Open northern and southern boudaries from the NEMO V2.0 standard version OBC prescribed in interpolating ORCA025-G70 Test OBC and compare with closed boundary simulations (buffer zones)  test with NATL4 and NATL12 On-line interpolation of the forcing fields (S. Theetten)  Read forcing on the ¼° grid and interpolate on-line on the 1/12° grid Test the routine from NEMO V2.0 standard version Workplan for 2007

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