Holocene East Asian monsoon variation inferred from species assemblage and shell chemistry of the ostracodes from Hulun Lake, Inner Mongolia

Holocene East Asian monsoon variation inferred from species assemblage and shell chemistry of the ostracodes from Hulun Lake, Inner Mongolia
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从内蒙古呼伦湖介形类物种组合和壳化学推断全新世东亚季风变化

DOI:
10.1016/j.yqres.2011.02.008
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发表时间:
2011-05
影响因子:
2.3
通讯作者:
Itoh, Shigeru
Itoh, Shigeru
中科院分区:
地球科学3区
文献类型:
--
作者:
Zhai, Dayou;Xiao, Jule;Zhou, Lang;Wen, Ruilin;Chang, Zhigang;Wang, Xu;Jin, Xindi;Pang, Qiqing;Itoh, Shigeru

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通过对内蒙古呼伦湖沉积物柱样中介形类的物种组成和壳化学特征的分析,探讨了全新世东亚夏季风边缘水文气候的变化。Darwinula stevensoni、Ilyocypris spp. 11,100 ~ 8300年前,本区湖泊的Mg/Ca、Sr/Ca和δ 18 O值较低,表明湖泊水位较高,水体较冷/淡水。Darwinula stevensoni下降幅度较大,Ilyocypris spp. 8300 ~ 6200年前,沿岸的介形类很少,化学指标仍处于低值,表明湖泊持续高位,但湖水变暖。6200年至4300年前,湖泊收缩,水变得凉爽/咸。沿岸的介形类在4300年至3350年前繁盛,标志着整个全新世最低的湖泊水位。3350 ~ 1900年前,湖水水位恢复,盐度下降。从1900年到500年前,湖泊保持了先前的状态,但降低了1100年到800年前的水位和盐度增加。近500年来,湖泊面积扩大,湖水盐度下降。资料表明,东亚夏季风在8300年前才开始增强,在4300 ~ 3350年前急剧减弱。
A sediment core from Hulun Lake, Inner Mongolia was analyzed for species assemblages and shell chemistry of ostracodes to investigate changes in the hydrology and climate of the East Asian summer monsoon margin during the Holocene. Darwinula stevensoni was abundant, Ilyocypris spp. scarce, littoral ostracodes absent and Mg/Ca, Sr/Ca and δ18O were low 11,100 to 8300 yr ago, indicating high lake levels and cool/fresh waters. Darwinula stevensoni declined largely, Ilyocypris spp. throve, littoral ostracodes were rare and chemical indicators remained in low values 8300 to 6200 yr ago, suggesting that the lake continued high stands but water became warm. The lake then contracted and water became cool/brackish 6200 to 4300 yr ago. Littoral ostracodes flourished 4300 to 3350 yr ago, marking the lowest lake levels of the entire Holocene. The lake level recovered and water salinity decreased 3350 to 1900 yr ago. From 1900 to 500 yr ago, the lake maintained the preceding status albeit lowered stands and increased salinities 1100 to 800 yr ago. During the recent 500 yr, the lake expanded and water salinity decreased. The data imply that the East Asian summer monsoon did not intensify until 8300 yr ago and weakened dramatically 4300 to 3350 yr ago.
DOI: 10.1007/s10750-010-0295-7
发表时间: 2010-05
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影响因子: 2.6
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影响因子: 2.1
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