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| 0267 |
Southern Tibet : vol.2 |
| 南チベット : vol.2 |
引用情報
OCR読み取り結果
CHAPTER XXVI.
PRECIPITATION IN N.W. INDIA COMPARED WITH THE
OSCILLATIONS IN THE LAKES.
From the records of precipitation in N.W. India available to me I have tried
to arrive at some conclusion regarding the relations between the changes in precipi-
tation and the oscillations of the lakes. In his monograph on the Rainfall of India,
BLANFORD regards the total annual rainfall of the Panjab, taken as a whole, as
subject to smaller vicissitudes than that of other provinces in N.W. India. ¹ Any
drought affecting the North-Western Provinces during the summer monsoon he regards
as usually shared by the Panjab, though the deficiency is often compensated by the
more copious rainfall in the earlier part of the year.
The period of observations, however, does not reach sufficiently far back to
enable us to draw any conclusions. But in Table No. 16, Simla, ² we find great
variations in the rainfall since 1862. Thus in 1867 it was only 52.10 inches, and in
1875 91.39. A regular periodicity cannot be said to exist. In Dehra Dun the observa-
tions go back to 1844, and there are differences between 35.11 (1848) and 119.93 (1885).
In Katmandu the differences move between 33.18 inches (1864) and 70.38 (1861).
Dr. GILBERT T. WALKER has discussed the problem of the Meteorological
evidence for supposed changes of climate in India. ³ According to Dr. WALKER
the comparative weakness of the monsoon in N.W. India after 1894 has given rise to
conjectures that the climate had altered permanently in that region. Increase of
irrigation or diminution in forests had, amongst other things, been made responsible
for the change.
Dr. Walker makes a very interesting comparison between the abundance of
the monsoon rainfall of N.W. India and the Nile flood: Of the countries affected by
the monsoon the only area for which reliable data extend over a satisfactorily long
period is Egypt, where the Nile data extend back as far as 1737 except for a break
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73
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95
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109
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121
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132
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144
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155
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167
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334
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356
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367
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381
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393
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403
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428
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461
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473
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487
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503
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517
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532
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