Mid-late Holocene maar lake-mire transition in northeast China triggered by hydroclimatic variability
Mid-late Holocene maar lake-mire transition in northeast China triggered by hydroclimatic variability
复制标题
DOI：
10.1016/j.quascirev.2019.07.027
复制
发表时间：
2019-09
影响因子：
4
通讯作者：
Mingming Zhang;Z. Bu;M. Jiang;Sheng-zhong Wang;Shasha Liu;Qing Jin;P. Shi
中科院分区：
文献类型：
--
作者：
Mingming Zhang;Z. Bu;M. Jiang;Sheng-zhong Wang;Shasha Liu;Qing Jin;P. Shi
中国东北长白山地区玛珥湖型泥炭地的密度位居世界前列。这些沉积系统包括泥炭和湖沼沉积物，为研究其对气候迫使的状态转变的敏感性所塑造的进化历史提供了宝贵的场所。为了研究玛珥湖-泥沼变化对水文气候变化的响应，我们根据沉积相、粒度、物理和化学性质、植物大化石和泥炭基础年龄研究了金川泥炭地的发育历史。结果表明，金川泥炭地主要起源于约7000cal的玛珥湖沼泽化。血压。中全新世以来，其水位不断上升，在5000～4000卡期间达到顶峰。年血压。金川泥炭地的向外扩张表明了一个气候驱动的模型，该模型基于水位变化叠加了下面的盆地形态。水文气候变化和泥炭地发育历史可分为三个时期。从 12 到 7 ka cal。 BP认为，东亚夏季风的增强是金川泥炭地的主要水汽来源。强烈的冬季亚洲冬季风（WAWM）和日本海最高海面温度（SST）引起的强烈蒸发作用可能使金川玛珥湖变成干燥高地。从 7 到 4 ka cal。 BP、东亚夏季风最大值和不断增加的西风急流（WJ）为泥炭地提供了水蒸气。日本海东亚冬季风和海温的降低导致蒸发效应减弱。金川泥炭地的湿度和水位逐渐升高。这一时期泥炭覆盖了68.97%的面积。自 4 ka cal. BP、降低的EASM和最大WJ为金川泥炭地提供了水汽。弱东亚冬季风和日本海较低的海温导致蒸发效应较低。泥炭地的湿度和水位达到最大。随后，泥炭面积进一步扩大，覆盖了剩余的31.03%面积。这项研究揭示了玛珥湖-沼泽变化与水文气候变率之间的显着联系，这对于未来预测全球气候变化下玛珥湖-沼泽生态系统的变化具有重要意义。
The density of maar lake type peatlands in the Changbai Mountain areas, northeast (NE) China is among the highest in the world. These deposition systems include both peat and limnic deposits, providing valuable sites to study their evolutionary history shaped by their sensitivity to climate-forced state shifts. To investigate the maar lake-mire shift in response to hydroclimatic variability, we examined developmental history of the Jinchuan peatland based on sedimentary facies, grain-size, physical and chemical properites, plant macrofossils and peat basal age. The results indicate that the Jinchuan peatland mainly originated from paludification in a maar lake from approximately 7000 cal. BP. Its water level continuously increased since the Middle Holocene, reaching the peak during the period of 5000–4000 cal. yr BP. The outward expansions of Jinchuan peatland suggest a climate–driven model based on which water level variability superimposes the underlying basin morphology. The hydroclimatic variability and peatland development history can be divided into three periods. From 12 to 7 ka cal. BP, the increasing East Asian summer monsoon (EASM) was the major water vapor source of Jinchuan peatland. The strong evaporation effects induced by the strong Winter Asian winter monsoon (WAWM) and the maximum sea surface temperatures (SSTs) of Japan Sea might have changed the Jinchuan maar lake into dry upland. From 7 to 4 ka cal. BP, the maximum EASM and increasing Westerly jet (WJ) provided water vapor for the peatland. The decreasing EAWM and SSTs of Japan Sea resulted in decreased evaporation effects. The moisture and water level in Jinchuan peatland gradually increased. The peat covered 68.97% of the area during this period. Since 4 ka cal. BP, the decreased EASM and the maximum WJ provided water vapor for the Jinchuan peatland. The weak EAWM and the lower SSTs of Japan Sea induced lower evaporation effects. The moisture and water level in the peatland reached the maximum. Subsequently, peat area further expanded and covered the remaining 31.03% area. This study reveals a remarkable link between the maar lake-mire shift and hydroclimatic variability, which is significant for future prediction of maar lake-mire ecosystem shifts under global climate change.