|A vertical cross
section along 05N is shown, depicting the winds, negative relative vorticity
contoured in red and positive relative vorticity contoured in blue, and
isotherms of potential temperature in degrees K contoured in cyan at an
interval of 2 degrees.. The negative
vorticity is increasing with height along the axis of circulation between
400-200 hPa. This is the same area
where the isotherms of potential temperature suggest that the circulation
might have cold core characteristics.
Thus in this case, the negative vorticity along the circulation axis
might correlate with cyclonic vorticity rather than anticyclonic vorticity as
one might expect from a northern hemisphere system.