The radar echo data observed near Vientiane, Laos, from
July 1 to September 30 of 2009 and 2010 were converted
to radar rainfall by using the common empirical radar–
rainfall relationship. The radar rainfall was then calibrated
by rain gauges with conversion factors defined each month.
Figure 6. Normalized scores of the dominant empirical orthogonal function (EOF) mode (red solid lines) of the (a) first,
(b) second, and (c) third EOF modes. Black thin dashed lines represent percentiles at 90% and 10% of the EOF score,
respectively. Black thick vertical solid line divides year 2009 and 2010
N. MAHAVIK ET AL.
—62—
CDARR was used to examine the rainfall pattern over the
middle of the ICP during the summer monsoon of 2009–
2010. EOF analysis was applied to the cube root of CDARR
to extract the dominant modes for the 184-day study period.
Three dominant EOF modes were selected because they
accounted for 40% of the total rainfall variability.