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Long-chain alkenones were detected in samples of sea surface sediments from the Chukchi Sea and the Bering Sea areas, the Arctic Pole. The analysis result indicates that C37:3 methylketone is predominate in the long-chain alkenones from the Chukchi and Bering Sea sediments. The abundance of C37 to C39 unsaturated alkenones changes in an order of C37 > C38 > C39. Based on C37 /C38 ratio, the detected organism precursors of the long-chain alkenones are mainly coccolithophrid (Emiliania huxleyi). By the calibration relationship between U37k and U37k indices, the sea surface paleotemperature in these seas is estimated. The estimated values of U37k vary from 4.147℃ to 5.706℃ , with a mean value of 5.092℃.
The analysis showed that C37: 3 methylketone is predominate in the long-chain alkenones from the Chukchi and Bering Sea sediments . The abundance of C37 to C39 unsaturated alkanes in the order C37> C38> C39. Based on C37 / C38 ratio, the detected organism precursors of the long-chain alkanes are mainly coccolithophrid (Emiliania huxleyi). By the calibration relationship between The estimated values of U37k vary from 4.147 ° C to 5.706 ° C, with a mean value of 5.092 ° C.