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以分子有机地球化学为手段对南海北部四万年来的古环境古气候研究表明,U3k7’-SST表层水温在冰期、间冰期平均范围分别为27℃和24℃,LGM与全新世温差达4.5℃;以高分子量烷烃所代表的陆源物质输入和长链不饱和酮化合物所代表的海洋初级生产力都呈现冰期高、间冰期低特征,表明冰期时陆源物质输入的增加和海洋表层生产力的提高;正构烷烃C31/C27记录了南方大陆的植被由冰期时草本植物占优势向间冰期时木本植物占优势的转变.说明南海在末次冰期以来气候的不稳定性,和海陆生态系统对气候变化的响应以及分子有机地球化学在古环境古气候研究中的巨大潜力.
The study of paleoenvironmental paleoclimate in the northern South China Sea for 40,000 years using molecular organic geochemistry indicated that the average surface water temperature of U3k7’-SST was 27 ℃ and 24 ℃ respectively during the glacial and interglacial periods. The temperature difference between LGM and Holocene reached 4.5 ℃ ; The marine primary productivity represented by terrigenous inputs and long-chain unsaturated ketones represented by high-molecular-weight alkanes all exhibit high ice age and low interglacial characteristics, indicating the increase of terrigenous inputs during the glacial period and the increase of marine surface productivity; The paraffin C31 / C27 records the predominance of vegetation from the dominant glacial period to the woody plants during the interglacial period in the southern mainland, illustrating the instability of the climate in the South China Sea since the last glacial period and the effects of land-sea ecosystems on climate change Response and the huge potential of molecular organic geochemistry in paleoenvironmental paleoclimate research.