李丽, 陈宇星, 王慧, 贺娟. 更新世以来南海表层水温变化及其古气候意义[J]. 海洋地质与第四纪地质, 2012, 32(4): 1-7. DOI: 10.3724/SP.J.1140.2012.04001
引用本文: 李丽, 陈宇星, 王慧, 贺娟. 更新世以来南海表层水温变化及其古气候意义[J]. 海洋地质与第四纪地质, 2012, 32(4): 1-7. DOI: 10.3724/SP.J.1140.2012.04001
LI Li, CHEN Yuxing, WANG Hui, HE Juan. SEA SURFACE TEMPERATURE CHANGE IN SOUTH CHINA SEA SINCE PLEISTOCENE AND ITS PALEOCLIMATIC IMPLICATIONS[J]. Marine Geology & Quaternary Geology, 2012, 32(4): 1-7. DOI: 10.3724/SP.J.1140.2012.04001
Citation: LI Li, CHEN Yuxing, WANG Hui, HE Juan. SEA SURFACE TEMPERATURE CHANGE IN SOUTH CHINA SEA SINCE PLEISTOCENE AND ITS PALEOCLIMATIC IMPLICATIONS[J]. Marine Geology & Quaternary Geology, 2012, 32(4): 1-7. DOI: 10.3724/SP.J.1140.2012.04001

更新世以来南海表层水温变化及其古气候意义

SEA SURFACE TEMPERATURE CHANGE IN SOUTH CHINA SEA SINCE PLEISTOCENE AND ITS PALEOCLIMATIC IMPLICATIONS

  • 摘要: 南海南部2 Ma以来古温度记录显示该海域更新世以来海水表层温度的不断降低,并且以冰期降低为特征,间冰期温度变化不大。南海南北经向表层海水温差的大小,反映了东亚冬季风的强弱变化,2 Ma以来的温差变化说明东亚冬季风在中更新世之前的持续强化,中更新世之后不断减弱,而在晚第四纪时又再次转为增强,同时叠加在长期变化趋势之上的是轨道时间尺度上冰期增强间冰期减弱的循环波动。青藏高原构造作用可能对中更新世时期东亚冬季风强化产生重要影响,而更新世以来东亚冬季风变化的整体趋势及轨道尺度变化主要受全球冰量变化和低纬ENSO影响。

     

    Abstract: The thermal history of the southern South China Sea (SCS) exhibited a reducing tendency since Pleistocene. The temperature profile is characterized by a cooling trend during glaciations but remains steady during interglaciations. Meridional thermal gradient between southern and northern SCS reflects the Eastern Asian Winter Monsoon (EAWM) change. Thermal gradient history during the past 2 Ma indicated that EAWM was strengthened before mid-Pleistocene and weakened since then, but restrengthened in the later Quaternary. This long term trend is superimposed by orbital glacial cycles with the EAWM stronger during interglaciations and weaker during glaciations. Tectonic uplifting of the Tibetan Plateau may have important influence on the strengthening of EAWM in the mid-Pleistocene. Global ice volume and ENSO changes may be the main reasons for the overall trend and the orbital cycle of EAWM.

     

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