Biastoch, Arne

Harlass, Jan

Matthes, Katja

Schwarzkopf, F. U.

OceanRep

Agulhas Dynamics and MOC in a High-Resolution Ocean-Atmosphere System ModelOcean Sciences Meeting 2018, PortlandPL53A: Advances in our understanding of the MOC in the South AtlanticJan Harlaß, A. Drews, F.U. Schwarzkopf, A. Biastoch, K. MatthesMotivationJan Harlaß | 02/16/2018 | Ocean Sciences Meeting 2018 - PL44A-1870Eddy resolving model including atmosphere-ocean-feedbacks[Durgadoo et al. 2013]Wind changes         Agulhas Leakage[Biastoch et al. 2015]Agulhas Leakage  AMOCFOCI - Flexible Ocean and Climate InfrastructureECHAM6~1.8˚/T63 L95StratosphereNEMO 3.61/2˚ L46OASIS3-MCTAGRIF 1/10˚Jan Harlaß | 02/16/2018 | Ocean Sciences Meeting 2018 - PL44A-1870Global 2m temperature˚C>3000 years simulatedAMOC max at 25˚N 18.3 Svno restoringpre industrial climate> 4000 yearsJan Harlaß | 02/16/2018 | Ocean Sciences Meeting 2018 - PL44A-1870FOCI - Flexible Ocean and Climate InfrastructureFOCI – High Resolution NestINALT10Jan Harlaß | 02/16/2018 | Ocean Sciences Meeting 2018 - PL44A-1870INALT10 coupled vs. ocean-only0 1000 years 150 yrsCoupled INALT10piControl 1850Accompanying ocean-only     experiments COREv2 forcing 30yr spin-up + hindcast 1958-2009Ocean-onlyCoupled70˚W - 70˚E, 50˚N - 10˚NJan Harlaß | 02/16/2018 | Ocean Sciences Meeting 2018 - PL44A-18701/10˚, L4664.5 million grid pointsSST bias in FOCICMIP5Coupled Coupled Nest DifferenceBoreal summerJASJan Harlaß | 02/16/2018 | Ocean Sciences Meeting 2018 - PL44A-1870AMOC timeseries 26˚N & 34˚SCoupled Ocean-only2yr filter; max upper 1500m14.45 11.1716.63 12.72NoNestINALT10Jan Harlaß | 02/16/2018 | Ocean Sciences Meeting 2018 - PL44A-187017.10 12.3418.30 13.98Mesoscale - SSH varianceAVISOMean: contours5d variance: shadingCoupled Ocean-onlyJan Harlaß | 02/16/2018 | Ocean Sciences Meeting 2018 - PL44A-1870Agulhas Current[Beal et al. 2015]Jan Harlaß | 02/16/2018 | Ocean Sciences Meeting 2018 - PL44A-1870100020003000400050000 240120018060Obs 2010-130 240120 180600 240120 18060 0 240120 18060Ocean-onlyCoupledDiff, Coupled -Ocean-only112.2 Sv 92.3 SvAgulhas Leakage - ARIANEJan Harlaß | 02/16/2018 | Ocean Sciences Meeting 2018 - PL44A-1870Agulhas CurrentAgulhas LeakageAgulhas Return Current• Seed particles at 32˚S• 5-daily mean velocities• Track for 4 years until leaving through sectionAgulhas LeakageOcean-onlyNoNestINALT10Agulhas CurrentJan Harlaß | 02/16/2018 | Ocean Sciences Meeting 2018 - PL44A-1870Agulhas Leakage80.83 64.3681.70 63.27Coupled31.60 32.9710.66 10.37Agulhas – Wind stressJan Harlaß | 02/16/2018 | Ocean Sciences Meeting 2018 - PL44A-187020˚E - 140˚EZonal averageOcean-onlyNoNestINALT1080.83 64.3681.70 63.27Coupled31.60 32.9710.66 10.37Agulhas CurrentAgulhas LeakageZonal MeridionalSummary & Outlook• Highly flexible and efficient model system• High-resolution AGRIF nests in a fully coupled model• Key quantities very well resolvedOngoing:• Agulhas Regime impact on AMOC• Transient runs starting 1850, present day & CMIP6 protocolJan Harlaß | 02/16/2018 | Ocean Sciences Meeting 2018 - PL44A-1870

Agulhas Dynamics and MOC in a High-Resolution Ocean-Atmosphere System Model

http://oceanrep.geomar.de/41913/1/OSM18_Harlass.pdf

Agulhas Dynamics and MOC in a High-Resolution Ocean-Atmosphere System Model

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