Paleoclimate of Southwest China: Development of the Asian Monsoon

题目：中国西南地区的古气候：亚洲季风的发展。该奖项支持对云南四个湖泊沉积物岩心的研究，该研究将用于重建中国西南地区晚更新世至今的古气候。获得了长14c测年剖面（10kyr BP）。与一般环流模式的“预测”相反，花粉、硅藻和地球化学数据表明，从湿润的晚更新世到干燥的早全新世的转变。沉积物记录也表明全新世期间湖泊水位发生了变化。近间隔采样和AMS定年将提高古气候记录的年代学分辨率。沉积介形虫壳中的稳定同位素和痕量金属比率将用于测试先前的古气候推断，并确定晚更新世的高湖泊水位是否是冰川融水输入的结果。古环境重建也将基于碳酸盐和有机质的稳定同位素信号。中国西南地区的代用古气候数据将揭示亚洲季风系统的发展，并可用于验证一般环流模式的湿度模拟。

Abstract ATM-9305750 Brenner, Mark Title: Paleoclimate of Southwest China: Development of the Asian Monsoon This award suports a study of sediment cores from four Yunnan lakes which will be used to reconstruct the paleoclimate of southwest China from late Pleistocene to present . Long, 14C-dated sections (10kyr BP) have been obtained. Contrary to "predictions" from general circulation models, pollen, diatom and geochemical data indicate a shift from wet late Pleistocene to drier early Holocene conditions. The sediment record also suggests lake-level shifts during the Holocene. Chronologic resolution of paleoclimatic records will be enhanced by close-interval sampling and AMS dating. Stable isotope and trace metal ratios in sedimented ostracod shells will be used to test previous paleoclimatic inferences and establish whether late-Pleistocene, high lake levels were a consequences of glacial meltwater input. Paleoenvironmental reconstruction will also be based on stable isotope signals in carbonates and organic matter. Proxy paleoclimatic data from southwest China will shed light on the development of the Asian monsoon system and can be used to test moisture simulations from general circulation models.