冰缘黄土沉积的陆螺壳δ18O记录：干旱大陆环境下降水δ18O和温度的新传递函数

IF 3.3 1区地球科学 Q1 GEOGRAPHY, PHYSICAL

Quaternary Science Reviews Pub Date : 2025-05-27 DOI:10.1016/j.quascirev.2025.109440

C. Richter , F. Walther , S. Meng , H. Reip , M. Schneider , M.M. Joachimski , M. Horsák

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引用次数: 0

摘要

我们对气候变化的认识是基于现在和过去气候数据的可用性。准确的参考数据对于改进地球系统模型至关重要，它帮助我们更准确地分析和预测气候的发展。在此背景下，亚化石蜗牛壳及其稳定同位素组成是有价值的气候指标。它们被用来推导过去降水同位素（δ 18opprecipitation），这是气候重建的一个重要参考参数。然而，冰缘黄土沉积物δ18O壳同位素的可解释性一直受到质疑，因为这些环境中水文循环的复杂性。研究大陆干燥条件下δ18Oshell和δ 18opprecipitation之间关系的校准研究仍然缺乏。为了弥补这一差距，我们在亚洲大陆内的现代干冰缘遗址收集了欧洲黄土沉积物中常见的两个属（Vallonia和Pupilla）。我们的研究结果证实了生长季节的δ18Oshell和δ 18opprecipitation之间有很强的正相关（adjR2 = 0.53, p≪0.001）。当只考虑瓦洛尼亚样品时，这种关系甚至更强（adjR2 = 0.60, p≪0.001），这表明存在一种属特异性反应。我们的研究结果支持陆地蜗牛壳作为干旱大陆环境δ18降水代理的适用性。此外，我们还提供了一个经验推导的传递函数来重建冰缘黄土档案的δ18Oshell的δ 18降水，以及一个用于温度近似的传递函数。这项研究表明，壳同位素作为定量气候指标的潜力很大，也可用于干旱大陆环境。但是，未来的研究应注重壳同位素数据的分辨率和校准数据的同步性，以提高数据精度。

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Landsnail shell δ18O records in periglacial loess deposits: New transfer functions for precipitation δ18O and temperature in dry continental settings

Our knowledge about climate change is based on the availability of climate data from both the present and the past. Accurate reference data are essential for improving Earth System Models, which help us to analyse and predict climatic developments with greater accuracy. In this context, subfossil landsnail shells and their stable isotope compositions are valuable climatic proxies. They are used to derive past precipitation isotopy (δ¹⁸O_{precipitation}), which represents an important reference parametre for climate reconstruction. However, the interpretability of δ¹⁸O shell isotopes in periglacial loess deposits has been questioned, due to the complexity of the hydrological cycle in these environments. Calibration studies investigating the relationship between δ¹⁸O_shell and δ¹⁸O_{precipitation} under continental dry conditions are still lacking. To close this gap, we collected two genera commonly found in European loess deposits (Vallonia and Pupilla) at modern dry periglacial sites in continental Inner Asia. Our results confirm a strong positive relationship between δ¹⁸O_shell and δ¹⁸O_{precipitation} of the growing season period (adjR² = 0.53, p ≪ 0.001). When only Vallonia samples were considered, the relationship was even stronger (adjR² = 0.60, p ≪ 0.001) indicating a genus-specific response. Our results support the suitability of landsnail shells as proxy for δ¹⁸O_{precipitation} in dry continental settings. Furthermore, we provide an empirically derived transfer function to reconstruct δ¹⁸O_{precipitation} from δ¹⁸O_shell for periglacial loess archives as well as a transfer function for temperature approximation. This study demonstrates the high potential of shell isotopes as a quantitative climate proxy also for dry continental environments. However, future studies should focus on the resolution of shell isotope data as well as the synchroneity of calibration data, to increase data precision.

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来源期刊

Quaternary Science Reviews 地学-地球科学综合

CiteScore

7.50

自引率

15.00%

发文量

388

审稿时长

3 months

期刊介绍： Quaternary Science Reviews caters for all aspects of Quaternary science, and includes, for example, geology, geomorphology, geography, archaeology, soil science, palaeobotany, palaeontology, palaeoclimatology and the full range of applicable dating methods. The dividing line between what constitutes the review paper and one which contains new original data is not easy to establish, so QSR also publishes papers with new data especially if these perform a review function. All the Quaternary sciences are changing rapidly and subject to re-evaluation as the pace of discovery quickens; thus the diverse but comprehensive role of Quaternary Science Reviews keeps readers abreast of the wider issues relating to new developments in the field.