Asian monsoon weather and climate and lake system changes on the Yunnan Plateau during the Late Holocene inferred from sclerochronological isotope patterns of gastropod shells and sediments from Xingyun and Fuxian lakes (Yunnan, China).

从星云湖和抚仙湖（中国云南）腹足动物贝壳和沉积物的年代学同位素模式推断全新世晚期云南高原的亚洲季风天气、气候和湖泊系统变化。

• 批准号: 259258841
• 负责人: Professor Dr. Frank Riedel
• 金额: --
• 依托单位: Institut für Geographische Wissenschaften
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2014
• 资助国家: 德国
• 起止时间: 2013-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/259258841?language=en
• 关键词: Asian; monsoon; weather; climate; lake

The Yunnan Plateau, in south-western China, is considered a key region for studying the interactions of the Asian monsoons with ENSO. It represents the south-eastern extension of the Tibetan Plateau and has been a cultural landscape exposed to climate extremes since the early Holocene. Severe droughts, such as during 2010-2011 which was followed by catastrophic floods, are unpredictable so far and thus demonstrate the importance of understanding characteristics and underlying mechanisms of climate extremes´ variability. We believe that establishing a new palaeo-weather archive of sub-monthly resolution may help to infer monsoon season onset, precipitation amount and length of the rainy season, or monsoon failure, in order to reconstruct possible cyclicities during the last ca. 6 ka; and based upon this we may be able to predict probabilities of future climate extremes. We have identified the shells of the lacustrine gastropod Margarya, which is extremely abundant in late Quaternary sediments of Xingyun Lake, to archive hydro-meteorological signals, that can be sclerochronologically explored by stable isotope analyses, in weekly resolution over ontogenies of at least three years. Preliminary investigations at Xingyun Lake have shown that Margarya shells can be retrieved by lake sediment coring in centennial resolution, in average. This means that for every century of the last 6 ka palaeo-weather signals of ca. 3 years are archived which can be used to analyze climate extremes and to infer Mid and Late Holocene seasonality changes. In comparison and correlation with other proxies the impact of climate extremes on the cultural development can be outlined.

位于中国西南部的云南高原被认为是研究亚洲季风与ENSO相互作用的关键地区。它代表了青藏高原的东南延伸，自全新世早期以来一直是暴露于极端气候的文化景观。迄今为止，严重干旱（例如 2010-2011 年期间随后发生的灾难性洪水）是不可预测的，因此表明了解极端气候变化的特征和潜在机制的重要性。我们认为，建立新的亚月分辨率的古天气档案可能有助于推断季风季节的开始、雨季的降水量和长度，或季风的消失，以便重建过去大约一年内可能的周期性。 6 ka；基于此，我们也许能够预测未来极端气候的概率。我们已经识别出湖相腹足动物 Margarya 的壳，该壳在星云湖晚第四纪沉积物中极其丰富，以存档水文气象信号，这些信号可以通过稳定同位素分析进行​​硬化年代学探索，每周分辨率至少三年的个体发育。星云湖的初步调查表明，通过湖底沉积物取芯可回收平均百年分辨率的玛格丽亚贝壳。这意味着过去 6 ka 的每个世纪，大约有 1 个世纪的古天气信号。存档了3年，可用于分析极端气候并推断全新世中晚期的季节性变化。通过与其他指标的比较和关联，可以概述极端气候对文化发展的影响。