However, during the northern winter (DJF), TMI is significantly higher over the
the western US, but lower in the eastern US, in Central America, in the eastern
part of China, and in the Mediterrean sea. Examinations of these regions show
significant seasonal trends in the paired t-statistics. In particular, in eastern
China, the difference reverses sign during the course of the year. In other regions,
the seasonal trends are less pronounced but with no sign of reversal. In the
northern summer (JJA), TMI is significantly lower in southwest Australia. The
seasonal difference between the V6 TPR and TMI is also computed. In general,
the sign of the difference remains but the significance is much reduced.
Seasonal patterns of the difference between 3B42 and 3B43 have been
computed. Figure 17.6 shows the percent bias of V5 3B42 relative to 3B43. The
seasonal patterns of the difference are in general similar to the annual case.
During DJF, there is a belt of negative bias (3B42 3B43) of more than 80%