Geochemistry of Lake Heihai on the Tibetan Plateau

• Main Authors: Ramisch, Arne, Tjallingii, Rik, Hartmann, Kai, Diekmann, Bernhard, Brauer, Achim
• Format: Dataset
• Language: English
• Published: PANGAEA 2018
• Subjects: AWI_Envi; AWI_PerDyn; AWI Arctic Land Expedition; China2011,China2012/1,China2012/2,China2012/3; CN-Land_2012; Lake Heihai; Qinghai; China; PC; Permafrost Research (Periglacial Dynamics) @ AWI; PG2057-1; Piston corer; Polar Terrestrial Environmental Systems @ AWI; Arctic; Climate change; permafrost
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.896505; https://doi.org/10.1594/PANGAEA.896505

Reading the sediment record in terms of past climates is challenging since linking climate change to the associated responses of sedimentary systems is not always straightforward. Here we analyze the erosional response of landscapes on the Tibetan Plateau to interglacial climate forcing. Using the theory of dynamical systems on Holocene time series of geochemical proxies, we derive a sedimentary response model that accurately simulates observed proxy variation in three lake records. The model suggests that millennial variations in sediment composition reflect a self‐organization of landscapes in response to abrupt climate change between 11.6 and 11.9 ka BP. The self‐organization is characterized by oscillations in sediment supply emerging from a feedback between physical and chemical erosion processes, with estimated response times between 3,000 to 18,000 years depending on catchment topography. The implications of our findings emphasize the need for landscape response models to decipher the paleoclimatic code in continental sediment records.