摘要
This paper presents the results of determining trace elements and δ 13C, δ 18O in Gyraulus sibirica shell continuously preserved in Xingcuo Lake sediments in the recent 50 years. By coupling these indexes and instrumental meteorological data on its basin to determine the relations among them, we probed quantitatively the climatic signals recorded in Xingcuo Lake sediments. The results showed that gastropod shells in Xingcuo Lake were formed in warm seasons; that trace elements, and stable isotope in shells just recorded the climatic signals of the warm seasons instead of that of the whole year; that Mg/Ca ratio and δ 18O proxy had certain correlation with air temperature in warm seasons, when the δ 18O proxy was more sensitive; with the average ratio of them being 0.28×10 -3/℃ and the variation rate dδ 18O/dT being 1.64×10 -3/℃; that the Sr/Ca ratio and δ 13C proxy, especially Sr/Ca ratio, had close correlation; and that dSr/Ca/dP was -0.045/mm.
This paper presents the results of determining trace elements and δ 13C, δ 18O in Gyraulus sibirica shell continuously preserved in Xingcuo Lake sediments in the recent 50 years. By coupling these indexes and instrumental meteorological data on its basin to determine the relations among them, we probed quantitatively the climatic signals recorded in Xingcuo Lake sediments. The results showed that gastropod shells in Xingcuo Lake were formed in warm seasons; that trace elements, and stable isotope in shells just recorded the climatic signals of the warm seasons instead of that of the whole year; that Mg/Ca ratio and δ 18O proxy had certain correlation with air temperature in warm seasons, when the δ 18O proxy was more sensitive; with the average ratio of them being 0.28×10 -3/℃ and the variation rate dδ 18O/dT being 1.64×10 -3/℃; that the Sr/Ca ratio and δ 13C proxy, especially Sr/Ca ratio, had close correlation; and that dSr/Ca/dP was -0.045/mm.
基金
ThisworkwasfundedbytheKeyInnovationProjectoftheChineseAcademyofSciences(KZCX1 -1 0 -0 2 ) ,theNaturalSci enceFundationofChina (Grant:4 980 30 0 1 )andNational"973"projectandCASTibetResearch (No:G1 9980 4 0 80 0 ) .
