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The Medieval Warm Period drought recorded in Lake Huguangyan,tropical South China

【摘要】:正The geochemistry of dated sediment cores from Huguangyan lake(21°9′N,110°17′E), tropical South China,reveals distinct stratigraphical patterns in organic and inorganic carbon(TOC, TIC),biogenic silica(BS),and total nitrogen(TN) over the past 1400 years.In this hydrologically closed lake,TIC variations may reflect changes in the precipitation/evaporation ratio,which controls the evaporative enrichment of carbonate.TOC,BS and TN in the sediment are proxy indicators of lake productivity and nutrient input,which we believe are linked to local precipitation.High TIC content correlates with low concentrations of TOC,BS,and TN,and indicates two drought episodes dated to AD 670-760 and AD 880-1260 in the sediments of lake Huguangyan.Local historical chronicles support these data,suggesting that the climate of tropical South China was dry during the Medieval Warm Period(MWP) and wet during the Little Ice Age(LIA).The detected MWP drought is temporally correlated with evidence for lower precipitation on the Guliya(China) and Quelccaya (Peru) ice caps,and with increased salinity in Moon Lake(USA Great Plains).

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