Climatic and human impact on the environment: Insight from the tetraether lipid temperature reconstruction in the Beibu Gulf, China

Climatic and human impact on the environment: Insight from the tetraether lipid temperature reconstruction in the Beibu Gulf, China
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气候和人类对环境的影响:中国北部湾四醚脂温度重建的见解

DOI:
10.1016/j.quaint.2019.12.004
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发表时间:
2020-01
影响因子:
2.2
通讯作者:
Ping'an Peng
Ping'an Peng
中科院分区:
地球科学3区
文献类型:
--
作者:
Weisen Liao;Jianfang Hu;Haoda Zhou;Ping'an Peng

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有机替代指标已被广泛用于重建海陆界面的温度和陆源输入变化。然而,人类活动对这些代用物的影响几乎没有受到限制,这可能导致对沉积物剖面的错误解释。为了研究气候和人类活动对沿海地区环境的影响,本文分析了北部湾115年沉积物岩心中的甘油二烷基甘油四醚(GDGTs)。结果表明,北部湾的类异戊二烯类GDGTs主要来源于古细菌,分支GDGTs主要来源于陆源土壤细菌。利用tex86指数重建海温的时间变化。结果表明,tex86海温变化主要受东亚季风系统控制,部分受ENSO事件控制。支化四醚甲基化指数或支化四醚环化指数(MBT/CBT)计算的年平均气温(MAAT)与1982年以前钦州站的MAAT记录相符。然而,1982年后的人口增长和经济发展导致陆源有机质输入减少,养分增加,导致古细菌大量繁殖,居支GDGTs比例增加,造成1982年后MBT/ cbt重建的MAAT分布分散。因此,人类对GDGT代用物的影响可以通过这种方式加以限制,以避免对古气候和古环境记录的误传。
Organic proxies have been widely used to reconstruct temperature and terrestrial input variation at the interface between land and sea. However, the impact of human activities on these proxies has been little constrained, which might cause the misinterpretation of the sediment profile. In order to study the climatic and human impact on the environment, proxies in coastal regions, glycerol dialkyl glycerol tetraethers (GDGTs) in a sediment core spanning 115 years was analyzed from Beibu Gulf, China. The results indicate that isoprenoid GDGTs in the Beibu Gulf were mainly derived from Thaumarchaeota and the branched GDGTs originated mainly from terrestrial soil bacteria. The TEX86index was applied to reconstruct the temporal SST variation. The results show that variation of TEX86-derived SST is controlled mainly by East Asian Monsoon system and partly by ENSO events. The methylation index of branched tetraethers or the cyclization index of branched tetraethers (MBT/CBT) derived mean annual air temperature (MAAT) agreed with MAAT record at the Qinzhou Station before 1982 AD. However, the population growth and economic development after 1982 AD caused the reduction of terrestrial organic matter input and increase of nutrient, leading to the thriving of Thaumarchaeota and increasing ofin situbranched GDGTs proportion, which created the scatter of the MBT/CBT-reconstructed MAAT after 1982 AD. Therefore, human influence on GDGT proxies can be constrained in this way to avoid misinterpretation of paleoclimate and paleoenvironment records.
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