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Variability and Changes in the Atlantic Atmosphere and Ocean Circulation

PI: Asgeir Sorteberg
Institution: Bjerknes Centre for Climate Research
Additional Investigators: Tore Furevik, Ina Kindem, Nils Gunnar Kvamstø
Abstract:
Variability and Long Term Trends in the North Atlantic Oscillation/Arctic Oscillation. Relations to the Stratosphere
(Asgeir Sorteberg, Tore Furevik, Ina Kindem, Nils Gunnar Kvamstø)

This will address:
Development in a range of NAO/AO indexes (two-point indexes, EOFs), multimodel variability and links to the simulated strength of the wintertime temperature and precipitation changes and the development of extremes. Variability and long term trends in the stratosphere. Will the polar vortex on the NH become colder and stronger as GHG increase or will the vortex become weaker and warmer as a result of increased wave activity from the troposphere? Changes in planetary wave activity will be investigated.


Changes in Interannual to Long-Term Variability of the Atlantic Meridional Overturning Circulation (AMOC).
(Yongqi Gao, Odd Helge Otterå, Helge Drange)

This will address:
Variability and changes in the AMOC, multimodel spread and links to the Atlantic Intertropical Convergence Zone and SST/SSS in the north-western tropical Atlantic.


Simulated Changes in the Atlantic Atmosphere and Ocean Fresh Water budgets
(Odd Helge Otterå)

This will address:
Variability and changes in the freshwater budget of the Atlantic Ocean and possible links to ENSO.


Simulated Changes in the Nordic Seas – Volume Transports
(Yongqi Gao, Odd Helge Otterå, Helge Drange)

This will address:
Variability, multimodel spread and changes in the volume transport of in intermediate and deep water through the Davis Strait, Fram Strait, Denmark Strait, Iceland-Scotland Ridge, south of Greenland and in the vicinity of Georges Banks will be investigated.
Publications:
  • Medhaug, I., and T. Furevik, 2011: North Atlantic 20th century multidecadal variability in coupled climate models: Sea surface temperature and ocean overturning circulation. Ocean Sci., 7, 389-404, doi:10.5194/os-7-389-2011. Abstract. Full Article. Edit.

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