Implications of stalagmite density for past climate change: An example from stalagmite growth during the last deglaciation from Wanxiang Cave, western Loess Plateau
Implications of stalagmite density for past climate change: An example from stalagmite growth during the last deglaciation from Wanxiang Cave, western Loess Plateau
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石笋密度对过去气候变化的影响——以黄土高原西部万象洞末次冰消期石笋生长为例
DOI：
10.1007/s11434-010-4190-4
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发表时间：
2010-12
期刊：
影响因子：
--
通讯作者：
ZHANG PingZhong
中科院分区：
文献类型：
--
作者：
CHENG Hai;WANG JiangLin;ZHANG DeZhong;WU XiuPing;BAI YiJun;JIA JiHong;YUAN Ye;SANG WenCui;ZHANG PingZhong
亚洲夏季风西缘甘肃省武都县万象洞WX 42 A石笋密度在末次冰消期不同沉积时期呈现规律性波动。高精度230 Th定年和高分辨率石笋密度数据表明，17644 ~ 12758 aBP的石笋密度-时间序列与反映亚洲季风强度的石笋δ 18 O记录十分相似。亚洲季风的加强/减弱（石笋δ 18 O值变轻/变重）伴随着石笋密度的增加/减少。在短时间尺度上，石笋密度的减少与季风撤退事件相关，如Allerød间寒冷期（IACP），Older Dryas（OD）和Bølling间寒冷期（IBCP）。这种石笋密度的降低反映了亚洲季风减弱导致的降水减少，从而减缓了洞穴滴水速率，减少了晶核，导致方解石晶体增大，生物活动减弱，土壤pCO 2降低，增加了石笋中不纯碎屑物质的丰度。在极端季风消退事件导致的降水和生物活动大幅减少期间，温度变化将主导石笋密度的波动。例如，在Heinrich事件1（H-1）期间，北大西洋温度突然下降时，石笋密度突然增加。这可能是由于渗透水温低，碳酸钙溶解较多，在较高的过饱和度下形成致密规则的晶体，导致石笋密度增大。石笋密度波动敏感地记录了石笋的生长历史和环境，表明石笋密度可以作为古气候研究的代用指标。
The density of a stalagmite (WX42A) from Wanxiang Cave, Wudu County, Gansu Province, China, in the western margin of the Asian summer monsoon region, presents regular fluctuations in different deposition periods during the last deglaciation. Over long timescales, high-precision230Th dating and high-resolution stalagmite density data indicate that the density-time series between 17644 a BP and 12758 a BP is quite similar to the stalagmiteδ18O record which reflects Asian monsoon intensity. Strengthening/weakening (lighter/heavier stalagmiteδ18O values) of the Asian monsoon is accompanied by increase/decrease in stalagmite density. Over short timescales, decrease in stalagmite density correlates to monsoon-retreat events such as the Inter-Allerød Cold Period (IACP), Older Dryas (OD) and Inter-Bølling Cold Period (IBCP). Generally, this kind of decrease in stalagmite density reflects precipitation decrease with weakening of the Asian monsoon, which in turn slows cave dripwater rate and decreases crystal nuclei, leading to enlargement of calcite crystals, weakened biological activity and decreased soilpCO2which increases the abundance of impure detrital materials in stalagmites. However, during the period of large amplitude reduction of precipitation and biological activity which resulted from extreme monsoon-retreat events, temperature variation would dominate fluctuation of stalagmite density. For example, stalagmite density increased suddenly when temperature dropped suddenly in the north Atlantic during Heinrich event 1 (H-1). This may be caused by low seepage water temperature, more dissolved calcium carbonate, compact regular crystals forming under higher supersaturation, leading to the stalagmite increased density. Stalagmite density fluctuation sensitively recorded stalagmite growth history and environment, demonstrating that stalagmite density can be used as a proxy for paleoclimatic research.
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