A streamlined body is a shape that lowers the friction drag between a fluid, like air and water, and an object moving through that fluid. ... It occurs when the fluid closest to the object sticks to its surface, exerting a force that opposes the object's motion.
To calculate the anomalies, from each monthly data point you subtract that month’s average. These monthly averages, called the “climatology”, are shown in the top row of Figure 2.
