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Internal and External Variability of MOC in the Kiel Climate Model (ECHAM5/NEMO)

Explore the internal and external factors influencing the Meridional Overturning Circulation in the Kiel Climate Model, including solar forced variability and responses at different time scales. Key findings on MOC variability in the North Atlantic and Southern Ocean regions are discussed.

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Internal and External Variability of MOC in the Kiel Climate Model (ECHAM5/NEMO)

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  1. Internal and external variability of MOC in the Kiel Climate Model (ECHAM5/NEMO)Wonsun Park & Mojib LatifLeibniz Institute of Marine Sciences, Kiel • Internal MOC variability • Multidecadal to Multicentennial scales • External solar forced variability • Idealized experiments THOR Annual Meeting, Paris, 25-26 November 2009

  2. The Kiel Climate Model (KCM)ECHAM5 (T31L19), NEMO (0.5-2°) Park et al. 2009 J. Clim.

  3. Atlantic MOC(ctrl, 4000yrs) Park and Latif 2008 GRL

  4. MOC mode separation LP 90yrs BP 30-90yrs

  5. SAT response to MOCMulticentennial vs. Multidecadal

  6. SH icevs. MOC Sea ice response to MOC

  7. SH Ice extent vs. MOC LP 90yrs: centennial to multicentennial BP 90-185 LP 185yrs

  8. Freshwater and Sea ice threshold SSS Park et al. in preparation

  9. Climate impacts Surface temperature SLP and wind stress Park et al. in preparation

  10. 1000 years 4W/m2 Millennial solar forcing experiments • Solar forcing integration (4200a) : periodic (P=1000a, ±2W/m2) • ECHAM5/MLO simulation (2000a)

  11. Northern Hemisphere temperatureresponse to external solar forcing Jones and Mann (2004) Jones and Mann (2004) reconstruction Latif et al. 2009 Met. Zeit.

  12. MOC feedback onto NH-SAT

  13. North Atlantic response

  14. Summary • Multidecadal variability is originated in the North Atlantic, whereas multicentennial variability is driven in the Southern Ocean. • Multicentennial Southern Ocean variability is related to the convective activities associated with sea ice capping threshold. • SO multicentennial signal is advected the North Atlantic, and provides stabilization (salinity) effect. • The MOC is strongly phase-locked to the external solar forcing, and provides a strong negative feedback on the NH-SAT.

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