High-resolution stalagmite δ18O records of Asian monsoon changes in central and southern China spanning the MIS 3/2 transition
High-resolution stalagmite δ18O records of Asian monsoon changes in central and southern China spanning the MIS 3/2 transition
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高分辨率石笋Ύ´18O记录了中国中南地区跨越MIS 3/2过渡期的亚洲季风变化
DOI：
10.1016/j.epsl.2010.07.041
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发表时间：
2010-09
影响因子：
5.3
通讯作者：
Kan Zhao
中科院分区：
文献类型：
--
作者：
Hai Cheng;Dianbing Liu;Yongjin Wang;R. Lawrence Edwards;Kan Zhao
根据876个氧同位素测量和25个精确的~（230）Th定年，对三堡、五鹿和大石堡洞穴石笋的高分辨率氧同位素记录，提供了32.5 ~ 20.8kaB.P.跨越了海洋同位素第三阶段和第二阶段之间的转变。方解石δ 18 O记录，虽然在地理上分布广泛（约1000公里），包括先前报道的葫芦记录，但在时间、形状和振幅上都是相似的。这些观测结果支持了洞穴沉积物δ 18 O的变化在很大程度上代表了与中国大部分地区夏季风环流有关的降水同位素组成的变化。这些剖面显示了四个百年至千年尺度的强夏季风事件，在时间和结构上类似于格陵兰Interstadials 5至3（GIS 5-3）。这些事件的年表完善了Hulu的记录，并广泛支持NGRIP GICC 05的时间尺度。在31.2kaB. P.、30.1kaB. P.、28.1kaB. P.、25.7kaB. P.和24.2kaB.P.所有这些都与格陵兰岛的体育场事件相对应。30.1和24.2ka事件与Heinrich 3和2日标对应。此外，这些事件与南极冰芯中的温暖事件相关，表明中国和南极对北大西洋冷却的气候反应相似，但意义相反。这些观察结果与两极跷跷板假说相一致。在百年尺度上，两个高纬度地区的AM环流与气候之间的强耦合表明，大气环流变化在全球气候突变信号的传递中起着重要作用。
High-resolution oxygen isotope records of three stalagmites from Sanbao (central China), Wulu (southern China) and Dashibao (southern China) Caves, based on 876 oxygen isotope measurements and 25 precise230Th dates, provide a detailed Asian monsoon (AM) history from 32.5 to 20.8kaB.P., spanning the shift between Marine Isotope Stages 3 and 2. The calcite δ18O records, although geographically widespread (about 1000km between them), including the previously-reported Hulu record, are similar in timing, shape, and amplitude. These observations support the idea that changes in speleothem δ18O largely represent variations of precipitation isotopic composition associated with large-scale summer monsoon circulation over a large portion of China. These profiles show four centennial to millennial scale strong summer monsoon events, analogous in timing and structure to Greenland Interstadials 5 through 3 (GIS 5–3). Chronology of the events refines the Hulu record and broadly supports the NGRIP GICC05 timescale. Five weak monsoon events are identified at 31.2, 30.1, 28.1, 25.7 and 24.2kaB.P., all of which correspond to stadial events in Greenland. The 30.1 and 24.2ka events correlate with Heinrich stadials 3 and 2. Furthermore, these events correlate to warm episodes in Antarctic ice cores, indicating that the climatic response to North Atlantic cooling is similar in China and in Antarctica, but in an opposite sense. These observations are consistent with the bi-polar seesaw hypothesis. The strong coupling between AM circulation and climate at both high latitudes at the centennial scale indicates that atmospheric circulation changes are important in transmitting abrupt climate signals globally.
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作者：
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作者：
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作者：
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