Fig. 4.4     Increasing diurnal ranges may be occurring in the winter and spring months as the inversion created by the Hawaiian High in the summer months is lifted.  Pierce College may look anomalous, but this city is known to exist in a frost pocket where minimal atmospheric mixing occurs. It is likely that the decreasing trend is allowed to continue in Pierce College because greenhouse gases aren’t as readily filtered out as they are in the rest of the Valley. The frost pocket of Pierce College is worthy of a paper in and of itself.

Fig. 4.5     Here we can see that the prolonged absence of the summer inversion has allowed for greenhouse gasses to become mixed through greater vertical depths thus resulting in higher diurnal ranges.