Palaeo-seasonality of the last two millennia reconstructed from the oxygen isotope composition of carbonates and diatom silica from Nar Gölü, central Turkey

Palaeo-seasonality of the last two millennia reconstructed from the oxygen isotope composition of carbonates and diatom silica from Nar Gölü, central Turkey
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根据土耳其中部纳尔古鲁的碳酸盐和硅藻二氧化硅的氧同位素组成重建了过去两千年的古季节性

DOI:
10.1016/j.quascirev.2012.07.014
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发表时间:
2013
影响因子:
4
通讯作者:
Dean J
Dean J
中科院分区:
地球科学1区
文献类型:
--
作者:
Dean J

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碳酸盐和硅藻很少一起沉积在湖泊沉积物中,其数量足以同时研究两种宿主的氧同位素组成(δ 18 O)。在这里,δ 18O碳酸盐与来自土耳其中部封闭湖泊Nar Gölü的纹状沉积物的δ 18O同位素数据进行了比较。湖泊监测表明,碳酸盐可能在5 - 6月沉淀,δ 18O碳酸盐是区域水量平衡的替代指标。硅藻的活动主要集中在春季。在公元301年至561年期间,δ 18O碳酸盐值是整个1710年期间最高的,表明夏季干旱,δ 18O校正值是最低的。硅藻生长期和碳酸盐沉淀期的δ 18 O值差异较大。我们认为,这可以解释为增加融雪,形成了一个淡水湖盖在硅藻生长高峰期的时间。增加的融雪也被推断为公元561 - 801年。从公元801年到现在,降水较少以冬季为主,尽管推测在公元921 - 1071年和小冰期后期(即公元19世纪中后期)融雪增加。通过结合一年中不同时间在湖泊中形成的主机的氧同位素数据,我们表明,这种分析可以提供对古季节性的见解。
Carbonates and diatoms are rarely deposited together in lake sediments in sufficient quantities for the oxygen isotope composition (δ18O) to be investigated simultaneously from both hosts. Here, δ18Ocarbonateare compared to δ18Odiatomdata from the varved sediments of Nar Gölü, a closed lake in central Turkey, over the last 1710 years. Lake monitoring suggests carbonate is probably precipitated during May–June and δ18Ocarbonateis a proxy for regional water balance. Diatom activity is mainly weighted towards the spring. At times between ∼301 and 561 AD, while δ18Ocarbonatevalues are the highest for the entire 1710 year period, suggesting summer drought, δ18Ocorrected-diatomvalues are among the lowest. δ18Olakewatervalues estimated for the times of diatom growth and carbonate precipitation show large differences. We suggest this could be explained by increased snowmelt that formed a freshwater lid on the lake at the time of peak diatom growth. Increased snowmelt is also inferred ∼561–801 AD. From 801 AD to the present, precipitation is less winter-dominated, although increased snowmelt is inferred 921–1071 AD and in the latter part of the Little Ice Age (i.e. the mid to late 1800s AD). By combining oxygen isotope data from hosts that form in lakes at different times of the year, we show that such analyses can provide insights into palaeo-seasonality.
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