October 23-26, 2012: AOMIP/FAMOS meetings

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Presentation transcript:

October 23-26, 2012: AOMIP/FAMOS meetings Workshop #16 Woods Hole Oceanographic Institution, Woods Hole Simulation of the variability of the Atlantic Water circulation in the Arctic Ocean: Model sensitivity studies Elena Golubeva Institute of Computational Mathematics and Mathematical Geophysics, SB RAS Novosibirsk, Russia

Atlantic Waters enter the Arctic ocean through the Fram Strait and Barents Sea and bring warm and salty water into the Arctic Ocean forming the so-called Atlantic layer. Currently assumed (after Rudels et al.,1994) that Atlantic waters in the Arctic move in the cyclonic sense as a boundary current topographically steered along continental slope and ridges. However, the numerous observational data collected during the last decades do not answer the question about the stability of this path. Are there other possible pathways of the Atlantic water? How important are the exchange processes between the boundary current and the interior of the Arctic Ocean or the arctic shelves?

Numerical model can be powerful tool for the circulation investigation, but first we are not sure that it simulates the correct circulation. According to our modeling experience numerical results are very sensitive to Atmosphere forcing Numerical grid resolution Sub-grid processes parameterization Advection numerical scheme Initial T-S-condition

CICE 3.14 ICMMG regional ocean model Atmosphere forcing NCEP/NCAR, CORE1,CORE2,…….. 1948-2011 CICE 3.14 ICMMG regional ocean model

RUN 1 1948-2011 Atm.Forcing- CORE2, PHC for initial T and S Numerical grid: 34-50км , 32 vertical levels

?

Averaged over region temperature change during the numerical run. What was wrong with 1985?

100 m 400 m 1000 m Back to the historical data Arctic circulation based on the density observational data for 1955 -1956 A.F.Treshnikov,G.I.Baranov,1972

Sensitivity to numerical grid resolution 34-50км , 32 vertical levels 14-19км 38 vertical levels

14-19км 38 vertical levels

Numerical grid resolution: 34-50км , 14-19км 32 vertical levels 38 vertical levels Temperature and velocity distribution at the depth of 400 m for 1975.

The AW circulation path in numerical model based on the coarse numerical grid is very unstable. Temperature distribution in the Atlantic layer is very sensitive to the numerical grid resolution. The main direction of the AW path in numerical model used 34-50 km resolution is similar to results for 14-19 km resolution. Thank you! Проблемы моделей