A high resolution climate reconstruction from annually laminated tufa deposits of the Qilian Mountains, NW China

中国西北部祁连山年层凝灰岩沉积物的高分辨率气候重建

• 批准号: 5442303
• 负责人: Professor Dr. Steffen Mischke
• 金额: --
• 依托单位: Faculty of Earth Sciences
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2005
• 资助国家: 德国
• 起止时间: 2004-12-31 至 2006-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5442303?language=en
• 关键词: resolution; climate; reconstruction; annually; laminated

In order to fully understand the causes and mechanisms of recentenvironmental change, it is necessary to develop highlydetailed and reliable records of past fluctuations. Unfortunately,there is a paucity of high-resolution paleoclimate datafrom the Tibetan plateau and Gobi desert transition zone. Asthe physical and isotopic hydrologic patterns in this regionare very complex, and thus very hard to model, there is a greatnecessity for a more accurate and thorough paleorecord. Avtivelyformed spring tufa carbonate from the central Qilian Mountains,located at 37°27¿N. 101°48¿E may contain a detailedrecord of climate change. The climate of this region is dominatedby the rainy summer monsoon and the dry winter monsoon. Theintensity of the Asian monsoon has undergone severe changesthroughout the Holocene which may be recorded in the geochemistryof the laminated tufa deposits. Stable isotope variationsalong vertical axes of tufa deposition combined with preciseU-series dating and lamination counting may provide a hightemporal resolution record of the summer monsoon intensity overthe last several thousand years.

为了充分理解最近心理变化的原因和机制，有必要对过去的波动进行高度详细和可靠的记录。遗憾的是，青藏高原-戈壁荒漠过渡带高分辨率的古气候资料非常缺乏。由于该地区的物理和同位素水文模式非常复杂，因此很难模拟，因此非常需要更准确和全面的古记录。祁连山中段37°27 <$N的人工形成的春季凝灰岩碳酸盐岩。101°48 <$E可能包含气候变化的详细记录。这一地区的气候主要受多雨的夏季风和干燥的冬季风的影响。亚洲季风强度在整个全新世经历了剧烈的变化，这可能记录在层状凝灰岩沉积的地球化学中。沿石灰华沉积物垂直轴的稳定同位素变化，结合精确的铀系定年和分层计数，可能提供过去几千年夏季风强度的高时间分辨率记录。