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Fig. 8.
Lidar data on 10 February, 2005.
typhoon was approaching, and the precipitation was 7.5 mm and the day-
light time was 5 h.
6.3.2
.Wintercase
Figure 8 shows the PAL data on 10 February, 2005. The daily precipitation
was 7.5 mm and daylight time was 4.3 h. The precipitation was recorded
during 3:00-6:00 and 19:00-21:00. However, the relative humidity in
the afternoon was less than 50%. This indicates that the precipitation
evaporated before reaching the ground. Such a situation can often be seen
in winter season. The rapid movement of the cloud base height is observed
for both summer and winter cases when the sunshine and precipitation
coexist on the same day.
6.4 . Appearance of cloud-top-boundary layer
Boundary layers capped with cloud layers are frequently seen in the
lidar data display. Such cases in summer (28 July, 2004) and in winter
(25 February, 2005) are shown in Figs. 9 and 10, respectively. On 28 July,
the precipitation and sunshine co-existed (hint of large fluctuation of cloud),
while a typhoon was approaching. On 25 February, 2005, it rained until
17:00, and it became cloudy thereafter. The relative humidity was very
high with a minimum value of 73%. Including these examples, all cases with
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