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0270	Southern Tibet : vol.2
南チベット : vol.2

0270

Southern Tibet : vol.2

南チベット : vol.2

192 PRECIPITATION IN N.W. INDIA COMPARED WITH THE OSCILLATIONS IN THE LAKES.

The same result is given by the table of Rainfall departure of Northwest India : 1

The last column shows that during the period 1904 to 1907 N.W. India got

a greater amount of rain than usual during the cold weather. It may be regarded

as probable that during the same period more snow than usual fell in the N.W.

Himalaya and round the Manasarovar. The snow masses thus accumulated in the

mountains forced the lake to rise in 1909 to 1911, in spite of the negative de-

parture which entered in 1908 and 1909. The latter fact also indicates that an ac-

cumulation of snow does not show its effect immediately, but only some three or

four years afterwards. Thus, for instance, the lake stood unusually low in the years

1906 and 1907, when the positive departure was at its maximum with + 1.39 and

+ I.46.

The above figures indicate a certain parallelism between the precipitation in

N.W. India and Western Himalaya, - and the outflow or isolation of the Manasarovar,

a parallelism which, of course, must exist. But the data we possess regarding the

behaviour of the lake are too meagre to allow us to draw absolutely reliable con-

clusions, and at our present state of knowledge, it would probably be impossible

to say whether the monsoon rains or the cold weather storms in N.W. India are the

most important factor affecting the rise and fall of the lakes, and the volume of

water in the rivers.

printed.

I These two Tables were put at my disposal by Dr. Gilbert T. Walker, before they were

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