摘要
腐殖化度作为气候代用指标首次用于我国泥炭的古气候研究 ,较好的记录了红原地区全新世的气候变化。对红原泥炭14 C测年和腐殖化度分析 ,获得了距今 12 0 0 0年较高分辨率红原地区气候变化记录 :11.815～ 10 .9kaB .P .,气候干冷 ;10 .9～ 5 .6kaB .P .,气候湿暖 ;5 .6～ 3.9kaB .P .,气候干冷 ;3.9～ 1.7kaB .P .,气候干冷、湿暖波动 ;1.7～ 0kaB .P .,气候干冷。总体而言 ,大约 5 .6kaB .P .是红原地区由早中全新世的湿暖气候向晚全新世干冷气候变化的转折点。同时 ,红原泥炭记录的降温事件在北半球具有普遍性 ,反映了青藏高原对全球气候变化的响应。
Humification as a climatic proxy was used for the first time to study peat. It has better recoded the climate change in the Hongyuan region. Hongyuan peat samples were taken for radiocarbon dating and were analyzed for peat humification. The result revealed the climate change at 12 kaB.P., that is: 11 8—10 9 kaB.P., dry—cold climate; 10 9—5 6 kaB.P., humid-warm climate; 5 6—3 9 kaB.P.,dry—cold climate; 3.9—1.7 kaB.P., changing from dry-cold to humid-warm, and 1.7—0 kaB.P., dry-cold climate. In a word, at 5.6 kaB.P., there was a change from Early-Mid Holocene humid-warm climate to Late Holocene dry-cold one. The cold events recorded by Hongyuan peat are common in northern hemisphere.
出处
《地质地球化学》
CSCD
2003年第2期51-56,共6页
Geology-Geochemistry
基金
国家自然科学基金重点项目 ( 4 0 2 3 10 0 7
4973 3 13 0 )
