CAJ | 학술논문

对南海北部陆坡 Site4B 站位末次冰盛期晚期至全新世(30~120cm)长链脂肪醇分布及碳同位素组成进行讨论,结果表明,长链脂肪醇碳优势指数(CPI,10.49~24.56)、平均碳链长(ACL,28.91~29.99)以及平均碳同位素组成(–28.85±0.97‰~–32.92±1.38‰)均反映了陆源 C3植物来源,代表了沉积物中陆源输入。Site4B 站位末次冰盛期末至晚更新世末(65~102cm,19.343~11.636ka BP)普遍较低的陆源输入均响应了大规模的冰融水事件19ka-MWP、MWP-1A、MWP-1B (melt water pulse, MWP)和暖气候事件(B/A事件),不具冰期/间冰期旋回变化特征。在末次冰盛期晚期(102~120cm)和全新世(30~60cm,10.490~约7.104 ka BP)陆源输入的旋回变化均反映了加强/减弱的冬季风/夏季风旋回变化,其中在末次冰盛期晚期记录一次冬季风最强事件,在早全新世至9.940ka BP记录一次夏季风最强事件。通过Site4B站位末次冰盛期末至晚更新世末(19.343~约11.636 ka BP)千年尺度陆源输入分布特征和全球冰期/间冰期旋回气候变化的对比,发现不具明确的区域对比性,可能受到低纬地区局地环境的作用所致。
대남해북부륙파 Site4B 참위말차빙성기만기지전신세(30~120cm)장련지방순분포급탄동위소조성진행토론,결과표명,장련지방순탄우세지수(CPI,10.49~24.56)、평균탄련장(ACL,28.91~29.99)이급평균탄동위소조성(–28.85±0.97‰~–32.92±1.38‰)균반영료륙원 C3식물래원,대표료침적물중륙원수입。Site4B 참위말차빙성기말지만경신세말(65~102cm,19.343~11.636ka BP)보편교저적륙원수입균향응료대규모적빙융수사건19ka-MWP、MWP-1A、MWP-1B (melt water pulse, MWP)화난기후사건(B/A사건),불구빙기/간빙기선회변화특정。재말차빙성기만기(102~120cm)화전신세(30~60cm,10.490~약7.104 ka BP)륙원수입적선회변화균반영료가강/감약적동계풍/하계풍선회변화,기중재말차빙성기만기기록일차동계풍최강사건,재조전신세지9.940ka BP기록일차하계풍최강사건。통과Site4B참위말차빙성기말지만경신세말(19.343~약11.636 ka BP)천년척도륙원수입분포특정화전구빙기/간빙기선회기후변화적대비,발현불구명학적구역대비성,가능수도저위지구국지배경적작용소치。
The distribution andδ13C composition of long chain n-alcohols from the late Last Glacial Maximum (LGM) to the Holocene in Site 4B core sediments from the continental slope of the northern South China Sea was discussed in this paper. The distribution of carbon preference index (CPI, 10.49~24.56), average chain length (ACL, 28.91~29.99) and average carbon isotope (–28.85‰±0.97‰ to–32.92‰±1.38‰) of long chain n-alcohols reflected a C3 higher plant source and a dominated <br> terrigenous input of organic materials into the sediments. The relatively low terrigenous input was related to the extensive melt water pulse (MWP) events (19ka-MWP, MWP-1A and MWP-1B), and B?lling-Aller?d (B/A) warming event from the end of the LGM to the end of the Late Pleistocene in Site 4B sediments (65~102cm, 19.343 to ~ 11.636 ka BP) without glacial period/interglacial period cycle. However, the distribution of the terrigenous input reflected intensified/weakened winter monsoon/summer monsoon cycle during the late LGM and Holocene, with the winter monsoon maximum periods recorded during the late LGM and the summer monsoon maximum periods in about 9.940ka BP. Compared with the cycle climate change of global glacial period/interglacial period, the distribution of the terrigenous input from the end of the LGM to the end of the Late Pleistocene in Site 4B sediments (19.343 to~11.636 ka BP) reflected ambiguous regional comparability, probably related to the regional environmental activity in low latitudes.