IIIFカラー高解像度
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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| IIIFカラー高解像度 |
| Southern Tibet : vol.2 | |
| 南チベット : vol.2 |
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引用情報
| 198 | THE MOVEMENTS OF THE KUMDAN GLACIERS. |
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| 1533 . | , closed |
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| 1812 . | . . open | 1780 |
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| 1821 . | . open | Before i800 |
| open | |
| 18241 |
| 1812--1824 |
| open | |
| 18281 | open | Sometime after | 1824 . , | closed | |
| 1818 | closed | 1833-1842 |
| closed | |
| 1840} |
| 1825 I |
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| 1836 | nearly closed |
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| 18381 |
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| 18401 | open |
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| 18501 |
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| 1842 . 1847 | . open open |
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| closed |
| 1848 | closed |
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| 1854 | closed |
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| 1858 |
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| 1862 | closed | 1860 |
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| 1863 | closed |
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| 1865 | open | 1865' |
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| 1 869 | closed |
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| 1873 | open |
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| 1889t | open |
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| 18901 |
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| open Pen |
| 1892 | open |
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| 1894 | open |
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| 1898 | open |
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| 1902 . | beginning to get closed | 1902 |
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| 1903 | closed |
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| 1904 | closed |
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| 191I |
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Comparing the two columns we find that the 35 year cycles nearly disappear — in my list, which gives instead a more irregular periodicity. As a rule the two columns run fairly parallel with each other, although I have exceptions from Longstaff's closed period of I825—I860. From his open period 1865-1902 there is only one exceptional year.
The list has the same fault as the above list on the effluence from the lakes: it is incomplete. Therefore a comparison between both leaves much room open for uncertainty. Theoretically it is very easy to say that there must be a certain parallelism between both classes of phenomena. For as Longstaff says: »It is probable that the explanation of such periodic glacier variations as I have described must be sought in the periodic variations of rainfall», therefore nobody can doubt that the oscillations in the lakes and the fluctuations in their effluence exclusively depend upon variations of rainfall. The same original cause influences both the lakes and the glaciers. During a period of abundant rain much water will flow to the Nlanasarovar and out of it, and perhaps out of the Rakas-tal as well; in the same period more snow than usual will accumulate in the mountains and feed the glaciers which consequently
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