基于中国黄土四醚膜脂的过去季风降水定量重建

IF 3.8 2区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Jingjing Guo, Martin Ziegler, Louise Fuchs, Youbin Sun, Francien Peterse
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引用次数: 0

摘要

摘要洞穴岩浆中氧同位素组成(δ18O)的变化以及来自黄土-古溶胶序列的大量代用记录揭示了过去东亚季风强度的变化。然而,在定量重建降水变化方面仍然存在挑战。在这里,我们利用中国黄土高原(CLP)现代表层土壤中支链甘油二烷基甘油四醚(brGDGTs)的环化程度(DC)与年平均降水量(MAP)之间的正相关关系来量化中国黄土高原过去季风降水量的变化。我们展示了中国黄土高原西部边缘元宝断面长达约13万年的基于直流电的新MAP记录,该记录密切追踪了同一断面的岩浆δ18O记录和植物蜡的氢同位素组成(δ2Hwax)的轨道变化和千年尺度变化。将我们的新数据与来自其他中南半岛站点的现有brGDGT记录相结合,可以发现在冰川时期,中南半岛西部的MAP空间梯度最为明显,降水量比东南部少约250毫米,而在全新世最佳时期,整个中南半岛的MAP约为850毫米。此外,直流电记录表明,中原盆地的降水量在前向尺度和斜向尺度上都有变化,这与元宝山岩浆δ18O和δ2Hwax主要在前向尺度上的变化以及磁感应强度等其他黄土代用指标的100-kyr周期的变化不同,后者更多的是表明EAM的相对强度。在跃迁尺度上,DC记录与同一断面的δ2Hwax以及speleothem的δ18O记录相位一致,这支持了季风降水受北半球夏季日照驱动的假说。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Quantitative reconstruction of past monsoon precipitation based on tetraether membrane lipids in Chinese loess
Abstract. Variations in the oxygen isotope composition (δ18O) of cave speleothems and numerous proxy records from loess-paleosol sequences have revealed past variations in East Asian monsoon (EAM) intensity. However, challenges persist in reconstructing precipitation changes quantitatively. Here, we use the positive relationship between the degree of cyclization (DC) of branched glycerol dialkyl glycerol tetraethers (brGDGTs) in modern surface soils from the Chinese loess Plateau (CLP) and mean annual precipitation (MAP) to quantify past monsoon precipitation changes on the CLP. We present a new ~130,000-year long DC-based MAP record for the Yuanbao section on the western edge of CLP, which closely tracks the orbital- and millennial-scale variations in both the speleothem δ18O record and the hydrogen isotope composition of plant waxes (δ2Hwax) from the same section. Combing our new data with existing brGDGT records from other CLP sites reveals a spatial gradient in MAP that is most pronounced during glacials, when the western CLP experiences more arid conditions and receives up to ~250 mm less precipitation than in the southeast, whereas MAP is ~850 mm across the CLP during the Holocene optimum. Furthermore, the DC records show that precipitation amount on the CLP varies at the precession as well as obliquity scale, as opposed to the primarily precession scale variations in speleothem δ18O and δ2Hwax at Yuanbao, and the 100-kyr cycle in other loess proxies such as magnetic susceptibility, which rather indicates the relative intensity of the EAM. At the precession scale, the DC record is in phase with δ2Hwax from same section as well as the speleothem δ18O record, which supports the hypothesis that monsoon precipitation is driven by northern hemisphere summer insolation.
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来源期刊
Climate of The Past
Climate of The Past 地学-气象与大气科学
CiteScore
7.40
自引率
14.00%
发文量
120
审稿时长
4-8 weeks
期刊介绍: Climate of the Past (CP) is a not-for-profit international scientific journal dedicated to the publication and discussion of research articles, short communications, and review papers on the climate history of the Earth. CP covers all temporal scales of climate change and variability, from geological time through to multidecadal studies of the last century. Studies focusing mainly on present and future climate are not within scope. The main subject areas are the following: reconstructions of past climate based on instrumental and historical data as well as proxy data from marine and terrestrial (including ice) archives; development and validation of new proxies, improvements of the precision and accuracy of proxy data; theoretical and empirical studies of processes in and feedback mechanisms between all climate system components in relation to past climate change on all space scales and timescales; simulation of past climate and model-based interpretation of palaeoclimate data for a better understanding of present and future climate variability and climate change.
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