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Changing environments related to dry climate of the Last Glacial in and around Japan

与日本及其周边地区末次冰期干燥气候相关的环境变化

基本信息

批准号：
06302072
负责人：
HIRAKAWA Kazuomi
金额：
$ 11.78万
依托单位：
HOKKAIDO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Co-operative Research (A)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06302072/
关键词：
Permafrost Pollen analysis Atmospheric general circulation River discharge Last Glacial Dry climate Fossilized animal assemblages Glacier 永久凍土レス古環境周氷河現象海洋環境

项目摘要

1.Changes of river discharge and climate were analyzed, on the basis of morphometric characteristics and distribution of fans, comparison of present river bed deposits and river terrace deposits, changes of river profiles and changes of processes on mountain slopes-valleys. Rivers in central Japan, Ohu Mountains, and Hidaka Range were studied for this purpose.2.Vegetation changes on slopes and their responses to landform and geomorphic processes were discussed on the basis of pollen analysis and size distribution analysis of deposits in closed basins in the southern part of Tohoku District. Also, biogeographical approaches to dryness in the Last Glacial maximum and to wetting trend in the Holocene were studied. Fossilized animal assemblages were analyzed in the Kinki and other districts.3.Glacial Iandforms were studied in East to Southeast Asia, such as in the Himalaya, China, and Borneo. In Japan, important results were obtained in the Hidaka Rage concerning the detailed glacial chron … More ology based on glacial landforms and deposits. A stereo photogramtric analysis was employed in attempting to reconstruct the amount of precipitation, altitudes of equilibrium lines of glaciers, and distribution of glaciers in the Last Glacial in the Hidaka Range.4.Studies on periglacial environments were conducted in northern Hokkaido with description of numerous numbers of ice wedge casts and with discussion of palaeoenvironments to form ice wedges. Other areas for periglacial studies include mountains in central Japan. These results will demonstrate possible needs for re-evaluation of the vertical zonation of periglacial environments in Japan.5.Wind-blown sand (loess) was studied in major sites on Hokkaido and Kyushu to calculate its flux. Investigation of loess was also initiated in China.6.Detailed oceanic environments were analyzed by cores and ^<14>C samples taken from Japan Sea. The results based on the quantitative data sets revealed that the great amount of loess deposited in the coldest period during the Last Glacial. In addition, analyzed were relationships between sea ice in the Okhotsk and air temperature changes in winter time in Hokkaido.7.Winter air temperature and snow amount of East Asia in the Last Glacial were examined by AGCM (Atmospheric General Circulation Model). Less

1.根据扇体的形态特征和分布、现代河床沉积与阶地沉积的对比、河流剖面的变化和山坡谷过程的变化，分析了河流流量和气候的变化。以日本中部河流、奥胡山脉和日高山脉为研究对象。2.通过对东北南部封闭盆地沉积物的孢粉分析和粒度分布分析，探讨了坡面植被变化及其对地形地貌过程的响应。此外，还研究了末次盛冰期干旱和全新世湿润趋势的地理学方法。对近畿和其他地区的动物化石组合进行了分析。3.对东亚至东南亚的冰川地貌进行了研究，如喜马拉雅山、中国和婆罗洲。在日本，日高Rage在详细的冰川年代学方面取得了重要成果 ...更多信息基于冰川地貌和沉积物的地质学。通过立体摄影分析，重建了日高山脉末次冰期的降水量、冰川平衡线高度和冰川分布。4.对北方北海道的冰缘环境进行了研究，描述了大量的冰楔投射，并讨论了形成冰楔的古环境。冰缘研究的其他地区包括日本中部的山脉。这些结果将表明可能需要重新评估日本冰缘环境的垂直地带性。5.在北海道和九州的主要地点研究了风沙（黄土），以计算其通量。6.通过对日本海沉积物的岩心和碳样品的分析，研究了日本海沉积物的海洋环境<14>。定量分析结果表明，黄土的大量沉积发生在末次冰期最冷的时期。此外，还分析了鄂霍次克海冰与北海道冬季气温变化的关系。7.利用AGCM（大气环流模式）对末次冰期东亚冬季气温和降雪量进行了分析。少