摘要
通过对青藏高原冰芯δ18O、黄土高原黄土及海洋同位素阶段记录的气候事件进行对比 ,认为三种不同介质所记录的晚更新世以来气候变化大趋势及主要气候事件是基本一致的 ,均具有 40Ka和 2 0Ka变化准周期 ,并可与北半球中高纬度地区太阳辐射量变化曲线进行对比。冰芯记录揭示出气候由冷变暖是缓慢发生的 ,从暖向冷是快速发生的 ,晚更新世最冷期在大约 2 3Ka;全新世大约从 5Ka开始降温 ;而海洋同位素阶段 ,黄土记录揭示出气候由冷变暖是快速的 ,从暖向冷是逐渐的 ,晚更新世最冷气候出现在大约 1 8Ka ;黄土揭示出全新世大约从 3Ka开始气候恶化。
The trend of climate change and main climate change events, obtained from ice core on Qinghai Xizang Plateau of China during late Pleistocene, marine isotope stage and loess paleosol sequence on the Loess Plateau of China are well compared. The climate change are characterized by 40 Ka and 20 Ka period and they are also well comparable to solar radiation change of mid high latitude in the Northern Hemisphere during the late Pleistocene. The data obtained from ice core indicates that climate changes from warm to cold is gradual and from cold to warm is rapid, the coldest climate is about 23 Ka during the late Pleistocene. However, the data obtained from marine isotope stage and loess paleosol sequence indicates that climate change from warm to cold is rapid and from cold to warm is gradual, the coldest climate is about 18 Ka.
出处
《高原气象》
CSCD
北大核心
2000年第4期504-511,共8页
Plateau Meteorology
基金
陕西省自然科学基金项目
中科院黄土与第四纪开放实验室基金(97D04)资助
关键词
冰芯
黄土
海洋同位素阶段
气候变化
Ice-core
Loess-paleosol sequence
Marine isotope stage
Climate change
