The difference of observed temperature of a place and the mean temperature of the latitude passing through that place is called Thermal Anomaly.
i.e. if the average temperature of 300 N latitude is 200c and the temperature of â€˜Aâ€™ place located on that latitude is 300c then the Thermal Anomaly is of 100c.
Positive Thermal Anomaly
If the observed temperature of a particular place is more than the mean temperature of the latitude of that place, the thermal anomaly is called positive thermal anomaly.
Negative Thermal Anomaly
If the observed temperature of a given place is less than that of the latitude of that place then it becomes negative thermal anomaly.
The lines drawn on the world map joining the places of equal thermal anomaly .
Author – Kalpana