The correct answer is polar cell.
Polar cell is termed as the transport of heat to polar latitudes from tropical to be accomplished.
Examples of cells which are found in the hemisphere include ferrel cells, polar cells, and Hadley cells.
Convection cell is termed as a phenomenon which is known to occur when there is a difference of density in the body of gas or liquid.
The difference occurs when there is rising and falling of currents. Any fluid from conventional cell can be formed. For example in the earth atmosphere.