These regions lie within tropical and subtropical zones where, according to Hong and Chang , the ageostrophic wind is more significant.
The mechanism considered to be behind the improved score of the new scheme can be attributed to the introduction of full wind nudging, which allowed the ageostrophic wind to behave as in nature.
Another part of the wind shear is that associated with the ageostrophic wind
, which is not directly related to the horizontal temperature gradient.
In our simulations some deviations probably stem from the choice of the wind forcing that ignores local ageostrophic wind components.
The inability of the model to reproduce high wave activity in June suggests that it is caused by local ageostrophic wind properties.
(2007) also pointed out that the calculation of meridional heat transports from reanalysis data is restricted by the accuracy of meridional, ageostrophic winds
. With the present wind data coverage in the Arctic region, the zonally averaged, meridional wind component is not well constrained.