王琳, 牛蕊, 孟庆浩, 孙诚诚, 郑祥民, 周立旻. 西藏羊八井七弄沟地区全新世温度变化的泥炭汞记录[J]. 海洋地质与第四纪地质, 2017, 37(2): 169-176. DOI: 10.16562/j.cnki.0256-1492.2017.02.017
引用本文: 王琳, 牛蕊, 孟庆浩, 孙诚诚, 郑祥民, 周立旻. 西藏羊八井七弄沟地区全新世温度变化的泥炭汞记录[J]. 海洋地质与第四纪地质, 2017, 37(2): 169-176. DOI: 10.16562/j.cnki.0256-1492.2017.02.017
WANG Lin, NIU Rui, MENG Qinghao, SUN Chengcheng, ZHENG Xiangmin, ZHOU Limin. HOLOCENE CLIMATE CHANGES RECORDED BY MERCURY CONCENTEATION IN PEAT: A CASE FROM QINONGGOU OF YANGBAJING, TIBETAN PLATEAU[J]. Marine Geology & Quaternary Geology, 2017, 37(2): 169-176. DOI: 10.16562/j.cnki.0256-1492.2017.02.017
Citation: WANG Lin, NIU Rui, MENG Qinghao, SUN Chengcheng, ZHENG Xiangmin, ZHOU Limin. HOLOCENE CLIMATE CHANGES RECORDED BY MERCURY CONCENTEATION IN PEAT: A CASE FROM QINONGGOU OF YANGBAJING, TIBETAN PLATEAU[J]. Marine Geology & Quaternary Geology, 2017, 37(2): 169-176. DOI: 10.16562/j.cnki.0256-1492.2017.02.017

西藏羊八井七弄沟地区全新世温度变化的泥炭汞记录

HOLOCENE CLIMATE CHANGES RECORDED BY MERCURY CONCENTEATION IN PEAT: A CASE FROM QINONGGOU OF YANGBAJING, TIBETAN PLATEAU

  • 摘要: 分析了青藏高原东南部羊八井七弄沟(QNG)地区泥炭中汞浓度含量指示温度变化的意义,通过与其他气候代用指标对比分析,发现泥炭汞能作为气候代用指标反映地区温度。QNG泥炭汞浓度变化记录了七弄沟地区全新世时期9.1~3.5 kaBP的温度变化趋势,主要包括3个阶段:第Ⅰ阶段(约9.1~7.2 kaBP),处于全新世大暖期,温度较高,波动下降;第Ⅱ阶段(约7.2~5.6 kaBP),温度波动剧烈,存在5.9和6.3 kaBP两个冷期;第Ⅲ阶段(约5.6~3.5 kaBP),在频繁剧烈波动中温度下降。3个阶段分别反映了3次北大西洋浮冰事件(IRD)(8.2、5.9和4.2 kaBP事件)。此外,在7.5、6.3、4.7 kaBP左右也出现了变冷事件。利用REDFIT对QNG泥炭汞浓度进行红色噪声谱分析,发现其存在1 100、650、450、310以及110 a周期,反映了青藏高原地区对不同等级太阳活动变化的响应。

     

    Abstract: We tried in this endeavor to rebuild the time series of temperature changes in Qinonggou(QNG) of Yangbajing in the southeast of the Tibetan Plateau. It is found that the mercury concentration in peat is a kind of good climatic proxy to monitor the regional temperature changes. The QNG peat recorded the variation in temperature form 9.1 kaBP to 3.5 kaBP in Holocene and could be divided into three phases: The PhaseⅠ(about 9.1 ~7.2 kaBP)was in the Holocene Megathermal stage of high temperature, but started dropping. The PhaseⅡ(about 7.2 ~5.6 kaBP), was the stage with fluctuated temperature changes. There occurred two large cold events happened in 5.9 kaBP and 6.3 kaBP respectively. The Phase Ⅲ(about 5.6 ~3.5 kaBP), was a stage showing a falling pattern with violent and frequent fluctuations. They may be correlated with the three events of ice rafted debris(IRD) in the North Atlantic Ocean, i.e. the 8.2, 5.9 and 4.2 ka events. In addition to them, there were also some cold events in 7.5 kaBP, 6.3 kaBP and 4.7 kaBP respectively. Using REDFIT to make red noise spectrum analysis, we observed from the peat mercury concentration some cycles in aquasi-periods of 1 100, 650, 450, 310 and 110 a, as a response to different scales of solar activities, suggesting that the region is much sensitive to the climatic changes caused by solar activities.

     

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