Correlation between oxygen and carbon isotopes of speleothems from Tian'e Cave, central China: Insights into the phase relationship between Asian summer and winter monsoons. (15th August 2019)

• Record Type: Journal Article
• Authors: Zhang, Jingwei; Liu, Shushuang; Liu, Dianbing; Kong, Xinggong; Fang, Yifan
• Is Part Of: Journal of Asian earth sciences. Volume 180(2019)
• Publication Date: 2019-08-15
• Subjects: Tian'e Cave -- Stalagmite -- Soil process -- Asian summer/winter monsoon correlation -- MIS 4; Earth sciences -- Asia -- Periodicals; Sciences de la terre -- Asie -- Périodiques; Earth sciences; Asia; Periodicals; 555.05
• DOI: 10.1016/j.jseaes.2019.103884
• Languages: English
• ISSNs: 1367-9120

Abstract

Graphical abstract: Highlights: High-resolution stable isotopic records from three stalagmites are used to reconstruct EASM and EAWM changes. Winter temperature is important for calcite δ 13 C variability via soil CO2 production. The EASM and EAWM variations are negatively correlated at a centennial scale. The relationship of millennial-scale EASM and EAWM changes are variable. Abstract: The correlation of East Asian summer and winter monsoons (EASM and EAWM) is believed to be variable at various timescales and under different climate backgrounds. In order to address this issue, high-resolution δ 18 O (depleted values indicating a strong EASM) and δ 13 C records (depleted values representing a weak EAWM) from three stalagmites, covering Marine Isotope Stages (MIS) 4 and 3, are reconstructed from an alpine cave in central China. During MIS 4, millennial-scale changes are clear in δ 18 O and δ 13 C records, while the δ 13 C is only characterized by centennial-scale variability across MIS 3. Changes in these speleothem δ 13 C records are supported by pollen records from the same area, which suggested millennial-scale alternations between conifer and deciduous broadleaf forests during MIS 4 and a stable C3-type vegetation in MIS 3. After detrended, δ 18 O changes are positively correlated with the δ 13 C record at a centennial scale, indicating an anti-phase of EASM and EAWM. In early MIS 4, however, an in-phase relationship of EASM and EAWM can be observed at a millennial scale. Thus, an anti-phased EASM/EAWM can be expected at a centennial scale, while a complicated correlation is seen at a millennial scale. These results imply a variable EASM/EAWM phase relationship under varying climatic conditions through the geological records and at different timescales.