A 1000-yr record of environmental change in NE China indicated by diatom assemblages from maar lake Erlongwan
A 1000-yr record of environmental change in NE China indicated by diatom assemblages from maar lake Erlongwan
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玛珥湖二龙湾硅藻组合揭示的中国东北地区1000年环境变化记录
DOI：
10.1016/j.yqres.2012.03.006
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发表时间：
2012-04
影响因子：
2.3
通讯作者：
Liu, Jiaqi
中科院分区：
文献类型：
--
作者：
Wang, Luo;Mackay, Anson W.;Rioual, Patrick;Panizzo, Virginia N.;Lu, Houyuan;Gu, Zhaoyan;Chu, Guoqiang;Yang, Deguang;Han, Jingtai;Liu, Jiaqi
基于硅藻相对丰度的过去环境变化是从中国东北部的玛尔湖二龙湾推断出来的。二龙湾湖湖相受强季节性区域气候的影响。硅藻组合的组成反过来又对冬季冰盖的季节性持续时间、春季和秋季水柱周转以及夏季热层化的变化做出反应。对沉积硅藻组合的统计分析揭示了过去1000年来三个重要的地层带。浮游物种迪氏藻的丰度最高出现在公元1050年至1400年之间，这意味着每年一次的无冰期，持续时间长，夏季水柱层结发达。这一浮游硅藻高峰期出现在公元1150年至1200年之间，表明这一时期是过去1000年来最温暖的时期。公元1400年至1800年之间的时间间隔以浮游硅藻的减少为标志，这表明无冰季节的持续时间较短，水域层结较弱，可能总体上是寒冷的条件。公元1800年以后，浮游硅藻的相对丰度再次增加，这表明年度无冰期的持续时间延长，水柱倾覆更强烈。所有这些数据都表明，MWP和20世纪的季节模式是不同的。
Past environmental changes based on diatom relative abundances have been inferred from the maar Lake Erlongwan in northeast China. The limnology of Lake Erlongwan is affected by the strongly seasonal regional climate. The composition of diatom assemblages, in turn, responds to changes in the seasonal duration of ice cover in winter, water-column turnover in spring and autumn, and thermal stratification in summer. Statistical analysis of the sedimentary diatom assemblages reveals three significant stratigraphic zones over the past 1000 yr. The highest abundance of the planktonic species Discostella species occurs between AD 1050 and 1400 and suggests an annual ice-free period of long duration and well-developed summer stratification of the water column. This planktonic diatom peak between ca. AD 1150 and 1200 suggests that this period was the warmest over the past 1000 yr. The interval between AD 1400 and 1800 is marked by a decline in planktonic diatoms and suggests shorter duration of the ice-free season, weaker water stratification and possibly generally cold conditions. After AD 1800 relative abundances of planktonic diatoms, including Puncticulata praetermissa and Asterionella formosa, increase again, which indicates lengthening of the duration of the annual ice-free period and a stronger overturn of the water column. All these data imply that the pattern of the seasons is different between the MWP and the 20th century.
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影响因子：
2.9
作者：
J. Smol;B. Cumming
通讯作者：
J. Smol;B. Cumming
影响因子：
2.7
作者：
Brian Moss
通讯作者：
Brian Moss
影响因子：
2.2
作者：
J. Stastny
通讯作者：
J. Stastny
影响因子：
1
作者：
C. Reynolds
通讯作者：
C. Reynolds
影响因子：
5.5
作者：
N. John Anderson;I. Renberg;Ulf Segerstrom
通讯作者：
N. John Anderson;I. Renberg;Ulf Segerstrom