OXYGEN ISOTOPE RECORDS OF STALAGMITES FROM SOUTHERN CHINA
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摘要: 中国南部石笋氧同位素记录记载了重要的气候变化信息。应用石笋氧同位素记录时首先需要考虑检验石笋的平衡结晶生长,特别是重复性检验,以排除可能的偶然性或地方因素。中国南部重复性很好的南京葫芦洞和贵州董歌洞石笋氧同位素记录主要代表了当时的降水氧同位素信息。两洞的记录都显示,在冰期或冰段时期降水的氧同位素比间冰期或间冰段时期明显偏重。受夏季风强弱变化的控制,与目前亚洲季风降水氧同位素的季节变化相对应,在间冰期或间冰段时,ITCZ偏北,降水以夏季风的大规模大气环流下的对流降水为主,其氧同位素较轻;相反地,在冰期或冰段时,ITCZ偏南,降水以夏季风爆发前的锋面降水为主,其氧同位素较重。虽然尚有其他许多影响因素,亚洲季风的变化应是影响中国南部石笋氧同位素在冰期/间冰期或冰段/间冰段的尺度上变化的主导因素。但在更小的尺度上(例如小冰期),石笋氧同位素记录的解释则需要谨慎。虽然下最终结论为时尚早,但作为亚洲季风的两个组成部分的东亚季风和印度季风很可能是同步的,至少在冰期/间冰期或冰段/间冰段的尺度上是如此。Abstract: Oxygen isotope records of stalagmites from Southern China provide very important climatic information. To avoid possible local-micro climate disturbances, tests for equilibrium deposit of carbonate, especially the replicate test, are essential. The well-replicated oxygen isotope records of stalagmites from Hulu and Dongge Cave, Southern China indicate temporal variation of oxygen isotopes in precipitations over the last two glacial-interglacial circles. It is obvious that the oxygen isotopes of precipitations are much heavier during glacial or Greenland stadial periods than in interglacial or Greenland interstadial periods. Controlled by Asian summer monsoon intensity and analogous to the modern precipitation of post-onset of Asian summer monsoon, the lighter oxygen isotopes characterized the precipitations in interglacial or Greenland interstadial period. This coincides with the northward shift in the ITCZ, producing tremendous convective precipitations. The scenario of pre-onset of Asian summer monsoon is just opposite and dominated with dynamic precipitations. Therefore, the intensity of Asian summer monsoon plays a key role in shaping oxygen isotope variations of stalagmites in Southern China on the timing scale of glacial/interglacial or stadial/interstadial. However, it is still an open question if the oxygen isotope excursion of smaller events, for example, Little Ice Age, also anti-correlates to summer monsoon intensity. It is most likely that East Asian and Indian monsoon, as two main components of Asian monsoon, are synchronous, at least, on the timing scale of glacial/interglacial or stadial/interstadial. We propose Asian summer monsoon interstadial/stadial (ASMI/ASMS) to describe the strong/weak intervals in Asian summer monsoon history. They are capable to be important benchmarks for calibrating and correlating climate changes, because of its longer temporal coverage, absolute-dated timing scale, close relation with low-middle latitudes, as well as global significances.
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Key words:
- stalagmite /
- oxygen isotope /
- Asian summer monsoon interstadial/stadial /
- Hulu Cave /
- Dongge Cave
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