Report of Activities from KielReport of Activities from Kiel

Claus Böning · Arne Biastoch · Joachim DenggClaus Böning · Arne Biastoch · Joachim Dengg

Wonsun Park · Sabine HüttlWonsun Park · Sabine Hüttl

Joke Lübbecke · Markus ScheinertJoke Lübbecke · Markus Scheinert

IFM-GEOMARIFM-GEOMAR

Model RunsModel 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

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

• Observability

MOC and Related Large-scale CirculationMOC and Related Large-scale Circulation

Arne Biastoch, Claus Böning, Joachim Dengg

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

2006)

Atlantic MOC Strength (36°N) in ORCA05

(Biastoch et. al, 2007)

full forcing variability

interannual wind variability onlyheat and freshwater

variability only

Influence of Freshwater on Subpolar North AtlanticInfluence of Freshwater on Subpolar North Atlantic

Markus Scheinert

• Freshwater balance in arctic and subpolar regions

• “Great Salinity Anomaly” events in CORE runs

Freshwater fluxes in 50-yr CORE runs

Freshwater balance in ORCA05

Tropical AtlanticTropical 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

Tropical PacificTropical Pacific

Joke Lübbecke

Subtropical cells (ORCA05, ORCA025)

• Western boundary vs. interior transport

• Impact on SST

• Variability on interannual to decadal time scales

Lagrangian analysis of ORCA05 data focusing on pathways into STCs

(colloboration with K. Döös, Stockholm)

WBC vs. interior in ORCA05

ECHAM5/NEMO coupled modelECHAM5/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

AgulhasAgulhas

Stalled due to

• Manpower Open Postdoc Position!

• Fundamental problems running AGRIF on NEC SX-8

Arne Biastoch

Australian ActivitiesAustralian Activities

Claus Böning