Index Value Plot

 

Index value plots are helpful in seeing the discrepancies and inconsistencies in data along with seeing the general trend of the data. In this map, the index value is 0. We see the el nino and la nina monthly index both going opposite directions on map and each a different color. Also from the legend we see the 12 month average from the map.

 

 

http://www.skepticalscience.com/What-causes-short-term-changes-in-ocean-heat.html