On the Periglacial Geomorphic Phenomena observed in the Johmon Ridge Area : Mechanism of Cold Anomalies

application/pdf The field data on periglacial geomorphic phenomena, including the cold anomalies,obtained in the Johmon Ridge area during the period from July to September in 1973 are a supplement to those listed in the report of 1972. The areas where severe frost-shattering and -cracking,and cold a...

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Bibliographic Details
Main Authors: 志保井, 利夫, 32260
Language:Japanese
Published: 北見工業大学 1974
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Online Access:https://kitami-it.repo.nii.ac.jp/record/6348/files/5-2-7.pdf
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Summary:application/pdf The field data on periglacial geomorphic phenomena, including the cold anomalies,obtained in the Johmon Ridge area during the period from July to September in 1973 are a supplement to those listed in the report of 1972. The areas where severe frost-shattering and -cracking,and cold anomalies occur predominantly are localized on the lee side of prevailing winter westeries or along the east fringe of the Taisetsu Mountain mass. The fact that the upper air temperature at 800 to 850 mb above Sapporo approximately parallels the temperature before sunrise at Onneyu means,essentially,that the cold climate of the Johmon Ridge area has continued since the last glacial time. The cold anomalies seem to be the sporadic remnants made under the low temperature during the glacial time,as is shown by the fact that the surviving botanical species and pika are those now usually seen above the forest line. The field evidences show that sporadic permafrost is expected to lie just beneath some of the cold anomalies obtained by the preliminary ‘rod probing'. The permafrost, if ascertained (by boring or test-cutting),will show that the cold source has survived since the last glacial time,because the present annual day-degree value is too high to Produce permafrost, especially at those low levels where many cold anomalies are observed. departmental bulletin paper