山东中更新世以来冰碛年龄、雪线高程与气候演化——以蒙山、崂山为例

Moraine Age Snow Line Elevation and Climate Evolution since Middle Pleistocene in Shandong Province——Setting Mengshan Mountain and Laoshan Mountain as an Example

古雪线直接反映了冰期时的气候特征,因此雪线是古冰川研究最终要解决的问题。2017年笔者等基于蒙山雪线的初步研究,发现东亚地区存在的雪线低洼区,采用了东亚冷槽的概念来表述该槽状雪线低洼区,并初步绘制了东亚冷槽的雪线高程。本文主要介绍了山东段(蒙山-崂山)的研究情况。根据山东蒙山、崂山34个光释光、宇生核素等方法获得的冰碛年龄数据及对应冰期雪线高程研究,表明崂山的雪线比蒙山要低,且在MIS6之前的冰期,崂山东侧冰碛多被现代海面淹没。研究表明,我国东部的气候敏感度要明显强于西部高原区,冰期时强劲的北路寒潮是我国东部地区冰川形成的核心气候因素。

The paleosnowline reflects the climatic characteristics of the historical glacial period directly.It is the ultimate problem to be solved in the study of ancient glaciers.Based on preliminary study of snow line of Mengshan mountain in 2017,low-lying areas of the snow line in East Asia has been found.By using the concept of East Asian cold trough(East Asian snow trough),the trough-like low-lying areas of the snow line has been described,and the elevation of the snow line in the East Asian cold trough has been preliminarily drawn.In this paper,the research in Shandong section(Mengshan mountain-Laoshan mountain)has been mainly introduced.According to the age data of moraine obtained by 34 methods of photoluminescence and Cosmogenic Nuclide in Mengshan mountain and Laoshan mountain in Shandong province,and the snow line elevation of corresponding glacial period,it is showed that the snow line of Laoshan mountain is lower than that of Mengshan mountain,and the moraine on the east side of Laoshan mountain is mostly submerged by modern sea surface in the glacial period before MIS6.As showed by the results,the climate sensitivity of the eastern part of China is much stronger than that of the western plateau.The strong northern cold wave during the glacial period is the core climate factor for the formation of glaciers in eastern China.