Synoptic Analyses of the Precipitation in Nepal in 1974 : <I>Glaciological Expedition to Nepal, Contribution No. 14</I>

概要

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A synoptic analyses were done of the precipitation in August and December in 1974. Types of precipitation in this August were much different between those in the northern coast of the Bengal Bay, the plain and high mountain area in Nepal. The monsoon currents come from the equatorial region, but the possibility of the intrusion of the monsson wind into the mountain area is affected by the behaviour of the westerly current in middle latitudes. When the Tibetan High move to the north, the monsoon wind easily flows into the Himalayan region. The position of the trough line of the wave in middle latitudes is also important. In the winter season, the precipitation in the plain area of Nepal is of the showery type, but rainfall in the high mountain area is relatively continuous. The relation between the precipitation and the behavior of the middle latitude upper level wind is more intimate in the winter season. To understand the precipitation in Nepal, the interaction of the middle and the low latitude atmospheric circulation, and also the local behavior of the mountain and valley winds in relation to the orographic conditions must be studied.
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