The role of mesoscale processes on the interoceanic exchange

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Report of Activities from Kiel Claus Böning
Arne Biastoch Joachim Dengg Wonsun Park
Sabine Hüttl Joke Lübbecke Markus
Scheinert IFM-GEOMAR
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Model Runs

• ORCA05 CORE runs
• different restoring parameterizations
• different forcing variability
• different regional variability
• ORCA025 CORE runs
• KAB001 1958-2004 with polar 3D restoring and 2
  tracers (CFC-11, SF6)
• KAB002 1985-2004 with strong polar SSS restoring
• Data stored on DODS-Server in Kiel
• Todo authentification from outside, LAS

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MOC and Related Large-scale Circulation

• Mechanisms of MOC variability in response to key
  mechanisms/regions
• Observability

Subpolar gyre transport variability and its
reverberation in the MOC (Böning et al., 2006)

• Atlantic MOC Strength (36N) in ORCA05 (Biastoch
  et. al, 2007)

Arne Biastoch, Claus Böning, Joachim Dengg
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Influence of Freshwater on Subpolar North Atlantic

• Freshwater balance in arctic and subpolar regions
• Great Salinity Anomaly events in CORE runs

• Freshwater balance in ORCA05

• Freshwater fluxes in 50-yr CORE runs

Markus Scheinert
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Tropical Atlantic

• Mean pathways subtropics-tropics
• Sources and role of the zonal current bands
• Connections to upwellingin the eastern tropical
  Atlantic
• Interannual to decadal variability in the topical
  Atlantic
• Influence and role of the subtropical-tropical
  cell (STC)
• Connections to MOC variability in the North
  Atlantic

Sabine Hüttl
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Tropical Pacific

• Subtropical cells (ORCA05, ORCA025)
• Western boundary vs. interior transport
• Impact on SST
• Variability on interannual to decadal time scales

• WBC vs. interior in ORCA05

• Lagrangian analysis of ORCA05 data focusing on
  pathways into STCs (colloboration with K. Döös,
  Stockholm)

Joke Lübbecke
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ECHAM5/NEMO coupled model

• KCM prototype with T31/ORCA2 resolution
• Two 500-yr simulations with difference atmosphere
  configurations
• Stable climate
• Different ENSO dynamics
• Reasonable sea ice distribution
• Low MOC
• Cold bias over North Atlantic

Wonsun Park, Noel Keenlyside, Mojib Latif, Rene
Redler
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Agulhas

• Stalled due to
• Manpower ? Open Postdoc Position!
• Fundamental problems running AGRIF on NEC SX-8

Arne Biastoch
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Australian Activities
Claus Böning