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현상민,Naokazu Ahagon,Maria Luisa G. Tejada,Mirko Alessandro C. Uy,Alyssa Peleo-Alampay,김길영,Minoru Ikehara 대한지질학회 2022 지질학회지 Vol.58 No.1
Two of alkenone and terrestrial n-alkane biomarkers derived from the South China Sea (SCS) International Ocean Discovery Program (IODP) 349 sediments were investigated to evaluate the relationship between paleoceanography and Asian monsoon variability since the last 400 ka. The average concentration of total alkenones is 0.43μg/g, and the alkenone-based sea surface temperature (SSTalk) ranged from 22.8 to 27.6℃ (average: 25.86℃; n = 73) at studied site U1432C. The concentration of n-alkanes shows high fluctuation through the glacial-interglacial periods with average 27.92 μg/g. Indices including average chain length (ACL) and carbon preferences index (CPI) showed large shifts and fluctuations, likely due to differences of delivery mechanism under the East Asian monsoon conditions. Specifically, spectral analysis of SSTalk shows a 40-kyr obliquity cycle. Therefore, both alkenone and terrestrial n-alkane biomarkers reflect the orbital obliquity cycle, the records of n-alkanes are not linearly associated with SSTalk paleoceanographic evolution in the last 400 ka. The results of this study suggest that the paleoceanography differs within the glacial-interglacial cycle. However, the terrestrial n-alkanes record developed a short-term variation during transportation reflecting paleoclimatic variation in East Asia region.