Paleoclimate of Southwest China: Development of the Asian Monsoon

摘要ATM-9305750 Brenner，Mark标题：中国西南部的古气候：亚洲季风的发展 该奖项支持了云南四个湖泊沉积物柱样的研究，这些研究将用于重建中国西南地区晚更新世至今的古气候。 已经获得了长的14 C测年切片（10 kyr BP）。 与大气环流模型的“预测”相反，花粉、硅藻和地球化学数据表明，晚更新世的湿润状态向全新世早期的干燥状态转变。 沉积物记录还表明，在全新世湖平面的变化。 近间隔采样和AMS测年将提高古气候记录的年代分辨率。 稳定同位素和微量金属比率在沉积介形虫壳将被用来测试以前的古气候推断，并建立晚更新世，高湖水位是否是冰川融水输入的后果。 古环境重建也将基于碳酸盐和有机质中的稳定同位素信号。 中国西南地区的代用古气候资料将有助于了解亚洲季风系统的发展，并可用于检验大气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.