Title of article :
Mozambique Channel eddies in GCMs: A question of resolution and slippage
Author/Authors :
Quartly، نويسنده , , G.D. and de Cuevas، نويسنده , , B.A. and Coward، نويسنده , , A.C.، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2013
Pages :
12
From page :
56
To page :
67
Abstract :
Hydrographic observations in the 21st century have shown that the flow within the Mozambique Channel is best described by a series of large poleward-propagating anticyclonic eddies, rather than, as previously thought, a continuous intense western boundary current. The portrayal of this region in various runs of the NEMO 75-level model is found to vary between those two descriptions depending upon the resolution used and the implementation of the model’s lateral boundary conditions. In a comparison of 1/4° resolution runs, the change of these conditions from free-slip to no-slip leads to the mean southward flow moving further offshore, with greater variability in the zonal and meridional velocities as the flow organises itself into eddies, and a reduction in total transport. If a realization of a model is unable to get these aspects of the physical flow correct, then this will significantly reduce its ability to show a realistic biological signal or long-term response to climate change. Further south, beyond Durban, the application of no-slip conditions similarly causes the mean Agulhas Current to lie further offshore, making it much more able to simulate Natal Pulses.
Keywords :
Boundary conditions , stability , Indian Ocean , Spatial resolution , NEMO , Mozambique Channel , Natal Pulse (current meandering)
Journal title :
Ocean Modelling
Serial Year :
2013
Journal title :
Ocean Modelling
Record number :
2281948
Link To Document :
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