国立情報学研究所 - ディジタル・シルクロード・プロジェクト
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| 0449 |
The Pulse of Asia : vol.1 |
| アジアの鼓動 : vol.1 |
引用情報
OCR読み取り結果
the largest type of pulsation; upon it are superposed the
great pulsations known as glacial epochs, each with a length
measured probably in tens of thousands of years; their
steady progress is in turn interrupted by smaller changes of
climate, such as those of which we have found evidence dur-
ing historic times in Central Asia; and finally, the climate
of the world pulsates in cycles of thirty-six years, and even
these are interrupted by seasonal changes and by storms.
A curve representing the climate of the earth during the last
million years would be almost infinitely complex, a sinuous
line composed of large curves superposed upon larger, small
upon large, and smaller upon small. It is conjectured that
the smaller changes of climate are due to varying amounts
of heat and other forms of energy received from the sun. It
is probable, though it has not been demonstrated, that the
larger are also due to the same cause.
Turning once more to our immediate subject, the changes
of climate in Asia during the last two thousand years, we
have seen that from analogy with the glacial and Brückner
cycles we should expect them to be world-wide. Many facts
point to the correctness of this view, though as yet the matter
has not been critically studied outside of Asia. To begin
where my own observations come to an end, Syria and
northern Arabia, from three to five hundred miles south of
Lake Gyoljuk, present phenomena almost identical with
those of Central Asia. Mr. F. A. Norris, a member of the
Princeton expedition to that region in 1904–05, states that
a large number of ruins lie in the desert in locations where
to-day there is no adequate water supply, and where it
would be impossible to secure sufficient water with the sys-
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