Holocene summer temperature record based on branched tetraethers in Northeast China
Holocene summer temperature record based on branched tetraethers in Northeast China
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DOI：
10.1177/09596836231197769
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发表时间：
2023-10
期刊：
影响因子：
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通讯作者：
Zeyang Zhu;Jing Wu;Jiaxin Lu;G. Chu;P. Rioual;Luo Wang;Jiaqi Liu
中科院分区：
文献类型：
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作者：
Zeyang Zhu;Jing Wu;Jiaxin Lu;G. Chu;P. Rioual;Luo Wang;Jiaqi Liu
全新世期间的温度演化表现出相互矛盾的模式，并产生了关于全新世是否遵循变暖或变冷趋势的争议。解决这一争议对于理解气候变化的根本机制和在更长的时间尺度上评估全球变暖至关重要。在这里，我们提出了一个定量的夏季温度重建的基础上分析从火山湖Kielguo火山口湖在中国东北（NE）的沉积序列的支化甘油二烷基甘油四醚。结果表明，东北地区夏季气温在10 ~ 2.2calkaBP期间呈明显的降温趋势，2.2calkaBP后开始上升。最暖期出现在~10-8.8 cal ka BP，温度约为15.8°C，最冷期出现在~2.3 cal ka BP，温度约为13.4°C。通过与东北地区其他气温记录的对比分析，我们认为东北地区夏季和冬季气温变化趋势可能分别受夏季和冬季太阳辐射和冰量的控制。东北地区年平均气温的变化是全新世夏季变冷和冬季变暖的叠加，以及7- 6calkaBP前冰量的减少迫使年平均气温升高的结果。年平均温度变化的转变可能与北方冰盖的崩溃有关。
The temperature evolution during the Holocene shows conflicting patterns and yields the controversy regarding whether the Holocene followed a warming or cooling trend. Resolving this controversy is critical for understanding the underlying mechanisms of climate change and evaluating global warming on a longer timescale. Here we present a quantitative summer temperature reconstruction based on branched glycerol dialkyl glycerol tetraethers analyzed from a sedimentary sequence retrieved from the volcanic lake Kielguo crater lake in Northeast (NE) China. Our record revealed that the summer temperature in NE China followed a rough cooling trend during ~10–2.2 cal ka BP and increased after ~2.2 cal ka BP. The warmest period appeared at ~10–8.8 cal ka BP with ~15.8°C, and the coldest time occurred at ~2.3 cal ka BP with ~13.4°C. Compared with other temperature records from NE China, we conclude that the summer and winter temperature change trends in NE China were probably controlled by the summer and winter insolation respectively, and the ice volume. The mean annual temperature changes in NE China resulted from the superposition of summer cooling and winter warming during the Holocene, and the decrease in ice volume forcing the increase in mean annual temperatures before ~7–6 cal ka BP. The switch in mean annual temperature changes was probably linked with the collapse of Northern Hemisphere ice sheets.