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Quantification of Holocene temperatures in the eastern Hunshandake Sandy Land using δ13C of loess organic matter
Global and Planetary Change ( IF 3.9 ) Pub Date : 2024-05-03 , DOI: 10.1016/j.gloplacha.2024.104457 Yuqiang Zeng , Xusheng Li , Yujia Liu , Yufang Li , Lisha Qin , Cheng Zhao , Menghui Liu , Yuwen Zhou , Zhiyong Han , Yong Wang , Bin Zhang , Shuangwen Yi
Global and Planetary Change ( IF 3.9 ) Pub Date : 2024-05-03 , DOI: 10.1016/j.gloplacha.2024.104457 Yuqiang Zeng , Xusheng Li , Yujia Liu , Yufang Li , Lisha Qin , Cheng Zhao , Menghui Liu , Yuwen Zhou , Zhiyong Han , Yong Wang , Bin Zhang , Shuangwen Yi
The soil organic carbon isotope indicator (δC) is widely used in paleoecology and paleoclimate reconstruction due to its ability to record the history of paleovegetation change. Although it has been used as a proxy for precipitation reconstruction, increasing evidence suggests that temperature has played a crucial role in influencing the relative abundance of C/C plants in the mid-latitudes during the interglacial period. This opens up the possibility of reconstructing Holocene temperature using δC. In this study, the variation of δC values in a Holocene loess profile (GLH profile), located in the eastern Hunshandake Sandy Land, China, was investigated. And we analyzed the correlation between δC values and modern temperatures for a total of 792 surface soil samples from mid-latitudes of the Northern Hemisphere, which had thermal conditions comparable to the GLH profile. Strong positive correlations were found between δC values of surface soil samples and both summer temperatures (r = 0.672, < 0.001) and growing season temperatures (r = 0.669, < 0.001). Additionally, δC values showed significant positive correlations with accumulated temperatures above 10 °C (r = 0.641, < 0.001) and above 0 °C (r = 0.527, < 0.001). However, the correlation with mean annual temperature was weak (r = 0.280, < 0.001). The δC variation in the GLH profile recorded a mixed C/C vegetation composition, with C plants comprising between 23.40% and 1.70% of the total abundance during the Holocene. The combined evidence from modern processes and profile variations confirms that warm-season temperature was the main factor driving variations in the δC values in the GLH profile. Therefore, we used δC–temperature conversion equations to quantify Holocene seasonal and accumulated temperatures based on the GLH profile. The reconstructed summer temperatures peaked at 9.3 ka, followed by a fluctuating downward trend during the mid- and late-Holocene, which is consistent with variations in summer solar insolation. Mean summer temperatures were relatively high at 23.3 °C and 22.5 °C in the early and mid-Holocene, respectively, while the lowest mean summer temperature of 20.5 °C occurred in the late Holocene. Accumulated temperatures above 10 °C and above 0 °C in the early Holocene were 3722 °C·d and 4641 °C·d, respectively, similar to modern observations in the Beijing area, indicating a southward shift of the temperature zone by nearly three degrees of latitude since the early Holocene. These reconstruction results are supported by modern observations, TraCE21 simulations, and other studies. This study is significant for extending the application of the δC indicator for quantitative paleoclimate reconstructions. It verifies its effectiveness in quantifying Holocene temperatures in the marginal zone of the East Asian summer monsoon.
更新日期：2024-05-03
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