Climatic structures and intensities of the last two glacials documented by terrestrial molluscs from Chinese loess sequences
Climatic structures and intensities of the last two glacials documented by terrestrial molluscs from Chinese loess sequences
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中国黄土序列中陆生软体动物记录的最后两次冰期的气候结构和强度
DOI：
10.1111/bor.12474
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发表时间：
2020-09
期刊：
影响因子：
2.2
通讯作者：
Houyuan Lu
中科院分区：
文献类型：
--
作者：
Dan Zhang;Naiqin Wu;Fengjiang Li;Denis-Didider Rousseau;Xiaoyun Chen;Yajie Dong;Houyuan Lu
了解过去冰期的结构和强度对了解第四纪古气候演化至关重要。陆生软体动物是过去环境条件的可靠代表，可以为冰川提供具体的气候见解。本文以中国黄土高原西峰和洛川剖面L2和L1黄土单元（分别相当于海洋同位素阶段（MIS） 6和4-2）的软体动物化石为基础，比较了最后两个冰期的气候演变。结果表明，两个冰期均为三方冰期结构，但强度不同，主要表现为寒干性（CA）软体动物（Vallonia tenera和Pupilla aeoli）的丰度差异。第一阶段（MIS 6为~191 ~ 184 ka， MIS 4为~71 ~ 57 ka）为寒冷干旱气候，主要表现为V. tenera和P. aeoli的丰度，以及热湿性（TH）物种的有限分布。第二阶段，MIS 6为~184 ~ 155 ka， MIS 3为~57 ~ 29 ka，气候相对温和湿润，tenera和P. aeoli减少，TH种增加。MIS 6的最后阶段（~155 ~ 130 ka）和MIS 2的最后阶段（~29 ~ 11.7 ka）是最冷和最干燥的阶段，表现为在MIS 6后期，tenera和P. aeoli占优势，而在MIS 2中，CA种生长所需的草地生物量减少。MIS 2期间的气候比MIS 6后期更冷、更干燥。我们认为冰川的结构主要受天文构造变化驱动的日照控制，其中倾角可能起主要作用。横跨中关带的不同冰川强度也可能与北半球冰盖和热带海洋温度的变化有关。
Knowledge of the structures and intensities of past glaciations is crucial for understanding Quaternary palaeoclimatic evolution. Terrestrial molluscs are a reliable proxy of past environmental conditions and can provide specific climatic insights into glacials. Here we compare the climatic evolution of the last two glacials, based on mollusc fossils from the L2 and L1 loess units (equivalent to Marine Isotope Stages (MIS) 6 and 4–2, respectively) of the Xifeng and Luochuan sections of the Chinese Loess Plateau (CLP). The results show that both glacials had a tripartite structure but with different intensities, as indicated by variations in the abundance of the dominant cold‐aridiphilous (CA) mollusc species, Vallonia tenera and Pupilla aeoli. The first stage, from ~191 to 184 ka for MIS 6, and from ~71 to 57 ka for MIS 4, was characterized by a cold, arid climate, as indicated by the abundance of V. tenera and P. aeoli, and the limited occurrence of thermo‐humidiphilous (TH) species. The second stage, from ~184 to 155 ka for MIS 6, and from ~57 to 29 ka for MIS 3, was characterized by a relatively mild, humid climate, indicated by a decrease in V. tenera and P. aeoli, and an increase in TH species. The last stage, from ~155 to 130 ka for MIS 6, and from ~29 to 11.7 ka for MIS 2, experienced the coldest and driest conditions, as indicated by the dominance of V. tenera and P. aeoli in late MIS 6 and by the reduced occurrence of the grassland biomass, necessary for the growth of CA species, in MIS 2. The climate during MIS 2 was much colder and drier than that during late MIS 6. We suggest that the structures of the glacials were controlled mainly by insolation driven by changing astronomical configurations, amongst which obliquity likely played the major role. The different glacial intensities across the CLP may also have been related to variations in Northern Hemisphere ice sheets and the temperature of the tropical oceans.
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DOI：
--
发表时间：
1985
期刊：
--
影响因子：
--
作者：
Dongsheng Liu
通讯作者：
Dongsheng Liu
40万年日照变化最小值期间北极冰盖的延迟形成
影响因子：
64.8
作者：
Hao, Qingzhen;Wang, Luo;Guo, Zhengtang
通讯作者：
Guo, Zhengtang
DOI：
10.1016/0031-0182(89)90143-0
发表时间：
1989-08-15
影响因子：
3
作者：
KUKLA, G;AN, ZS
通讯作者：
AN, ZS
中国西部黄土高原陆生软体动物记录揭示的东亚季风晚第三纪演化：从冬季到夏季主导的亚制度
影响因子：
5.3
作者：
Li, Fengjiang;Rousseau, Denis-Didier;Pei, Yunpeng
通讯作者：
Pei, Yunpeng
影响因子：
64.8
作者：
Bintanja, R;van de Wal, RSW;Oerlemans, J
通讯作者：
Oerlemans, J