How to differentiate northern and southern hemisphere while plotting wind speed and direction using matplotlib barb fuction in python -

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i have created wind speed , direction plots using matplotlib barb function. it's working fine unable differentiate northern , southern hemisphere while ploting wind speed , direction.

please let me know how differentiate both data using plot 

 plt.barbs(data['x'], data['y'], data['u'], data['v'], length=8, pivot='middle')





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