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ORCA-LIM experiments with the interannual Large & Yeager forcing

ORCA-LIM experiments with the interannual Large & Yeager forcing. Claus Böning, Arne Biastoch, Ulf Schweckendiek, Sabine Hüttl, Joke Lübbecke (IFM-GEOMAR, Kiel) with special thanks to our French colleagues collaborating in the DRAKKAR project.

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ORCA-LIM experiments with the interannual Large & Yeager forcing

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  1. ORCA-LIM experiments with the interannual Large & Yeager forcing Claus Böning, Arne Biastoch, Ulf Schweckendiek, Sabine Hüttl, Joke Lübbecke (IFM-GEOMAR, Kiel) with special thanks to our French colleagues collaborating in the DRAKKAR project

  2. Examples of interannual-decadal variability in ORCA2 and ORCA05: • Tropical oceans: EUC and STC-transports, SST • ACC (Drake Passage) transport • Atlantic MOC transport • [Sea ice coverage] Question: effect of long-term drifts in the CNYF-runs ?

  3. Tropical circulation: examples of spin-up behaviors (CORE-1) EUC transports Sv GFDL Pacific ORCA2 years ORCA2 Atlantic ORCA05

  4. Pacific SST anomalies

  5. CORE-2: Pacific SST variability (Nino3):ORCA05 , ORCA2vs. Data

  6. SST variability (Nino3-region) in ORCA05vs. SOI index

  7. Pacific Subtropical-Tropical overturning Cells (STCs):Equatorward transports across 10°N/10°S Sv ORCA05 ORCA2 • robust trend ! • (-14 Sv) shown here: Deviations from long-term means: 59 Sv (ORCA2), 67 Sv (ORCA05)

  8. Atlantic: SST anomalies after 50 yrs spin-up (CORE-1)

  9. SST variability (ATL4-region): ORCA05 vs. Reynolds

  10. Atlantic STC-index (8°N/8°S) ORCA05 – ORCA05 – ORCA2 – FLAME(1/3) - trend: robust (+2 Sv) - year-to-year var.: differing - decadal variab. (> 5 yrs): fairly robust

  11. Annual cycle of the EUC at 23°W (after 50-yr spin-up) ORCA2 and MICOM (W.Hazeleger, KNMI)

  12. ORCA2 - MICOM - ORCA05

  13. EUC (23°W) ORCA2 – MICOM - ORCA05 - FLAME1/12

  14. Regarding simulations of tropical variability: CORE-II experiments help to identify where models are robust and where results are sensitive to model choices: - (inter-)decadal transport changes are very robust - seasonal-interannual variability: differs between realizations

  15. Drake Passage transport (two ORCA05-cases)

  16. Drake Passage transport anomalies(deviations from the climatological reference runs)

  17. Atlantic MOC (45°N)

  18. MOC anomalies(deviations from the climatological reference runs) ORCA05 – 3 realizations FLAME-1/3° ORCA2 ORCA05

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