Response of humification degree to monsoon climate during the Holocene from the Hongyuan peat bog, eastern Tibetan Plateau
Response of humification degree to monsoon climate during the Holocene from the Hongyuan peat bog, eastern Tibetan Plateau
复制标题
青藏高原东部红源泥炭沼泽全新世腐殖化程度对季风气候的响应
DOI：
10.1016/j.palaeo.2009.12.015
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发表时间：
2010-02
影响因子：
3
通讯作者：
Xu, Hai
中科院分区：
文献类型：
--
作者：
Wang, Hua;Hong, Yetang;Lin, Qinghua;Hong, Bing;Zhu, Yongxuan;Wang, Yu;Xu, Hai
泥炭的腐殖化程度被用来指示欧洲的气候变化，欧洲以海洋性气候为主。然而，到目前为止，在季风气候的亚洲，几乎没有做过什么研究。首次测定了青藏高原东部红原泥炭碱提的吸光度时间序列。将其作为泥炭腐殖化程度的替代指标，并与全新世印度洋夏季风的替代指标--泥炭中苔草纤维素的δ13C时间序列进行了比较。结果表明，泥炭腐殖化程度能灵敏地反映印度洋夏季风强度的变化。在轨道和千年时间尺度上，腐殖化程度越高，季风活动越强，腐殖化程度越低，季风活动越弱。青藏高原东部地区泥炭腐殖化程度的替代气候意义似乎与欧洲大陆不同。这种差异可以归因于季风气候引起的局部生物地球化学过程的影响，包括水分和温度的组合变化、干湿交替变化和冻融效应。
The humification degree of peat has been used to indicate climate variations in Europe, with a dominant maritime climate. However, little research has been done so far in Asia, with a monsoon climate. Here for the first time, the absorbance value time series of the alkali-extraction of Hongyuan peat from the eastern Tibetan Plateau is determined. This is used as the proxy indicator for the humification degree of peat, and we compare it with the δ13C time series of the Carex mulieensis cellulose in the peat which has been used as a proxy indicator for the Indian Ocean summer monsoon during the Holocene. Our data show that the humification degree of peat can sensitively reflect the strength variation of the Indian Ocean summer monsoon. Both on orbital and millennial timescales, higher humification degree corresponds with stronger monsoon activity, and lower humification degree corresponds with weaker monsoon activity. The proxy-climate significance of the humification degree of the peat in the eastern Tibetan Plateau region seems to differ from that in the European continent. This difference could be attributed to the influences of local biogeochemical processes caused by the monsoon climate, including the varying combination of moisture and temperature, the alternating drying–rewetting variation, and the freeze–thaw effect.
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