Paleoclimatic Variations in Ningjinpo Area since Late Pleistocene as Indicated by n-Alkanes
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摘要: 华北地区晚更新世以来气候变化研究具有重要的意义.选择宁晋泊地区开展河湖相沉积物的分子化石研究.结果表明，沉积物中正构烷烃碳数分布范围为C15~C33，高碳数奇碳优势明显，多以C29和C31为主峰的单峰分布，少量样品出现以C17为次主峰的双峰分布，表明有机质以陆生植物和大型水生植物为主.结合正构烷烃参数，分析了宁晋泊地区晚更新世以来的气候演变过程，展现了"83~68 ka气候较为温和，湖泊水位较低；68~30 ka气候暖湿，湖泊扩张；30~22 ka气候冷干，湖泊萎缩；22~10 ka气候好转，湖泊水位上升；全新世气候温和适度，湖泊水位略有降低"的特征.区域对比分析表明，末次冰期以来宁晋泊地区与延庆盆地等地的气候变化基本一致，具有冰期-间冰期旋回特征，说明其主要受太阳辐射的控制.Abstract: It is of importance to reconstruct the paleoclimatic variations since late Pleistocene in North China. In this paper, it selected Ningjinpo area to characterize the paleoclimatic oscillations with the aid of microbial lipids. Results indicate that the carbon number distributions of most samples ranged from C15 to C33, with the dominance of high carbon (C29 and C31 in particular) in most samples and some lower homologue as secondary peak (C17 for instance), suggesting the mixed origin from higher plants and aquatic organisms. According to the parameters derived from n-alkanes, alternative paleoclimatic conditions of the study area from warm climate with low lake level (83-68 ka), hot-wet period with lake expansion (68-30 ka), cold-dry duration with shrinking lake (30-22 ka), hot and wet climate with increasing lake level (22-10 ka), to moderate climate period (10-0 ka) were reconstructed since late Pleistocene. Regional comparison demonstrated the similar glacial-interglacial paleoclimatic patterns occurred in Ningjinpo area and Yanqing basin, potentially suggesting the principal control of solar radiation.
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Key words:
- n-alkane /
- climatic implication /
- paleovegetation /
- paleoclimatic variation /
- Ningjinpo area /
- climate change
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图 2 宁晋泊千户营剖面部分样品正构烷烃分布特征
Fig. 2. Distribution patterns of n-alkanes in typical samples from Qianhuying profile in Ningjinpo area
图 3 千户营剖面正构烷烃参数与延庆盆地、太阳辐射量变化及深海氧同位素对比
Fig. 3. Distribution of n-alkanes from Qianhuying profile in Ningjinpo area in comparison with results from Yanqing basin, summer solar radiation, and oxygen isotope record in the Sulu Sea
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