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Xingcuo lake,a closed one,is situated in eastern Tibetan Plateau.There are abundant snail shells Gy-raulus sibirica in its sediments.Here we display the determining results ofδ 13 C,δ 18 O in shell Gyraulus sibirica continuous-ly preserved in Xincuo Lake sediment s in the recent 50years.And by coupling the indexes ofδ 13 C,δ 18 O and instrumen-tal meteorological data in its basin to build relative function relation s among them,we probe quantitatively climatic sig-nals recorded in those indexes.The r esults show that there are remarkabl e relations betweenδ 13 C proxy and precipitation,δ 18 Oproxy and air temperature,of which correlative coefficient was 0.89an d 0.71,respectively.Besides,we also demon-strated that average variation betw eenδ 13 C proxy and precipitation(dδ 13 C /dP)was 0.027‰/mm and 1.64‰/℃forδ 18 O and air temperature(dδ 18 O /dT).
Xingcuo lake, a closed one, is situated in eastern Tibetan Plateau. There are abundant snail shells Gy-raulus sibirica in its sediments. Here we display the determining results of δ 13 C, δ 18 O in shell Gyraulus sibirica continuous-ly preserved in Xincuo Lake sediment s in the recent 50 years. And by coupling the indexes of δ 13 C, δ 18 O and instrumen-tal meteorological data in its basin to build relative function relation among them, we probe quantitatively climatic sig-nals recorded in those indexes. The r esults show that there are remarkabl e relations between δ 13 C proxy and precipitation, δ 18 Oproxy and air temperature, of which correlative coefficient was 0.89 an d 0.71, respectively.Besides, we also demon-strated that average variation betw een δ 13 C proxy and precipitation (dδ 13 C / dP) was 0.027 ‰ / mm and 1.64 ‰ / ° C for δ 18 O and air temperature (dδ 18 O / dT).