地球科学进展 ›› 2006, Vol. 21 ›› Issue (4): 338 -345. doi: 10.11867/j.issn.1001-8166.2006.04.0338

干旱气候变化与可持续发展 上一篇    下一篇

地球圈层相互作用中的深海过程和深海记录(II):气候变化的热带驱动与碳循环
汪品先,翦知湣,刘志飞   
  1. 同济大学海洋地质国家重点实验室,上海 200092
  • 收稿日期:2006-02-12 修回日期:2006-03-08 出版日期:2006-04-15
  • 通讯作者: 汪品先 E-mail:pxwang@online.sh.cn
  • 基金资助:

    国家重点基础研究发展计划项目“地球圈层相互作用中的深海过程和深海记录”(编号:G2000078500)资助.

Interactions Between the Earth Spheres: Deep-Sea Processes and Records(II) Tropical Forcing of Climate Changes and Carbon Cycling

Wang Pinxian,Jian Zhimin,Liu Zhifei   

  1. State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China
  • Received:2006-02-12 Revised:2006-03-08 Online:2006-04-15 Published:2006-04-15

地球轨道变化驱动冰期旋回的理论是气候演变研究在20世纪的最大突破。然而以65°N太阳辐射量为准的传统轨道理论,忽视了低纬区和碳循环的作用。本项目以“西太平洋暖池”为重点,通过地质资料和气候数值模拟的结合,揭示了“西太平洋暖池”和东亚季风发育的阶段性,发现了暖池海区冰消期表层水升温超前于北半球冰盖的融化。在南沙海区发现了碳同位素有40~50万年长周期,经过全球对比和对意大利上新世地层的实测与分析,证明这是世界大洋碳储库对于地球运行轨道偏心率长周期的响应,并推测是通过浮游植物群改变有机碳在海洋碳沉积中的比例所致。研究表明热带驱动和碳循环在气候演变中重要性,其正确认识是预测气候长期演变趋势的前提。是“深海973”项目总结报道之后的续篇,对上述成果作专题讨论。

The theory of orbital forcing of glacial cycles is an outstanding breakthrough of paleoclimate research in the 20th century. However, the classical orbital forcing theory was based on solar radiation at 65°N and failed to take the low latitudes and carbon cycling into consideration. The present project of “deep-sea processes and records” targets at the ignored aspects of the theory. Combining the geological records with climatic numerical modeling, we recognized the step-wise process of development of the “Western Pacific Warm Pool” and the East Asian monsoon system, and found that the sea surface warming in the Warm Pool was leading the melting process of the boreal ice-sheet during the deglaciation. We discovered a long periodicity of 400-500 ka in the carbon isotope records from the Nansha area, southern south China sea. After a global comparison and analyses of the Pliocene sections in Italy, we were able to prove that this is a response of the oceanic carbon reservoir to the long eccentricity cycle, and hypothetically explained the carbon reservoir changes by “rain ratio” variations induced by phytoplankton composition. Our studies demonstrated the critical role played by tropical forcing and carbon cycling in the global climate changes, and their recognition is prerequisite to any scientific prediction of the long-term trends in climate changes. The present is the second paper following the first one providing a general description of the project.

中图分类号: 

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