ECOLOGICAL RESPONSE OF δ13C TO HOLOCENE CLIMATE CHANGES FROM STALAGMITE RECORD IN NUANHE CAVE, LIAONING
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摘要: 基于辽宁暖和洞年层石笋NH5的7个230Th年龄和962个碳同位素数据,建立了10.6~3.5 kaBP时段全新世气候及生态演化的δ13C序列,其长期演化趋势与北大西洋海表温度变化基本一致。该记录表明,10.6~8.8 kaBP,δ13C值逐渐负偏,由-9.4‰降至-10.3‰,气候逐渐转暖湿;8.8~6.7 kaBP,δ13C值负偏显著,平均值为-11.3‰,此时,气候温暖湿润,对应于全新世适宜期,纹层计数显示其持续时间约为1 945 a;6.7~3.5 kaBP,δ13C值显著正偏,由-11.3‰升至-8.3‰,干旱化趋势明显。石笋δ18O时间序列显示出相似的变化趋势。在6.7 kaBP前后,δ13C、δ18O均快速正偏,纹层计数显示约在40 a内完成气候由暖湿到冷干的突变转型,可能是由于北大西洋海表温度降低和植被-大气系统的反馈作用对太阳辐射减少具有放大效应。Abstract: A speleothem δ13C time series was reconstructed based on 962 stable isotope measurements and 7 230Th dates. The sequence covers a time range from 10.6 to 3.5 ka BP, suggesting the evolution of ecological conditions and associated climate changes. The long-term trend of the δ13C profile bears a high similarity to SST changes in North Atlantic. Three phases are evident in the stalagmite δ13C record:(1) a transition to humid climate in 10.6~8.8 kaBP, during which δ13C value displays negative excursions from-9.4‰ to -10.3‰; (2) a humid stage between 8.8 and 6.7 kaBP, in which the δ13C value shows negative excursions to the minimum with an average δ13C value of -11.3‰. Temporally, this period is in line with the Holocene Optimum; (3) a gradually drying period from 6.7 to 3.5 kaBP, during which δ13C value displays positive excursions from -11.3‰ to -8.3‰. Constrained by annual layer counting, the duration of the Holocene Optimum in our record is about 1945 years. Both δ13C and δ18O records show a rapid positive excursion around 6.7 kaBP, indicating an abrupt climate transformation. Annual layer counting suggests that the duration of transformation is about 40 years. It reveals that the interaction of vegetation atmosphere system and lower SST in North Atlantic may amplify the influence of reduced solar insolation via feedback processes.
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Key words:
- carbon isotope /
- Holocene Optimum /
- abrupt climate change /
- stalagmite /
- Nuanhe Cave
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