We have used in situ produced cosmogenic nuclides 10Be and 26Al to date lacustrine
shorelines around eight lakes in Tibet. Two lakes located south of the Yarlung Tsangpo
River discharged at high lake levels. One of them, Drolung Co (Co is a local term, meaning
lake), became closed (its water level fell below its outlet channel) at∼ 3.8 ka and lowered
over 120m vertically since then. This implies a significant change in intensity of precipitation
driven by the Indian monsoon over southern Tibet in the middle-late Holocene. Nam Co and …