松嫩平原末次冰期以来环流模式与沙尘路径的解耦——来自哈尔滨沙尘沉积物定量物源重建的启示

IF 3.1 3区 地球科学 Q2 GEOGRAPHY, PHYSICAL Aeolian Research Pub Date : 2022-08-01 DOI:10.1016/j.aeolia.2022.100818
Peng Wu , Yuanyun Xie , Yue Li , Chunguo Kang , Yunping Chi , Lei Sun , Zhenyu Wei
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引用次数: 0

摘要

了解欧亚黄土带最东缘沙尘沉积的来源,对于理解松嫩平原环流模式与沙尘源-汇路径之间的联系至关重要。本文收集了哈尔滨地区末次冰期以来的黄土-古土壤序列(20)和现代沙尘暴沉积物(7)以及潜在沙源区(104)共131个样品,进行元素地球化学分析,量化了沙源分配,并比较了Frequentist和Bayesian模型的性能。经过极差检验、非参数Kruskal-Wallis h检验和逐步判别函数分析,优选出14种地球化学性质(V、Zn、Ga、Sr、Mo、Ba、Pb、Y/Ta、MREEN/MREEN*、Th/Sc、Th/U、La/Sc、Zr/Hf和Co/Th)的最佳复合指纹图谱。在两个模型中,黄土层序和沙尘暴沉积的源贡献大小依次为:松嫩沙地西南部(57 ~ 95%,49 ~ 97%)、科尔沁沙地和鄂沁达嘎沙地(2 ~ 43%,0 ~ 31%)、松嫩沙地西北部(0 ~ 21%,0 ~ 20%)和呼伦贝尔沙地(0%,0 ~ 8%)。根据拟合优度和虚拟混合,结合均方根误差和平均绝对误差,我们认为频率模型在量化粉尘源方面比贝叶斯模型稍微准确一些。沙地扮演着重要的粉尘中转站的角色。黄土层序与现代沙尘源重建结果的对比表明,环流模式(冰期以西北风为主)与沙尘路径(以西南方向为主)存在解耦合关系,面积小、植被覆盖率高和地形阻隔是造成北西向沙尘排放明显受限的主要原因。最后,研究强调,改善西南方向沙地的土地管理措施可能有助于改善哈尔滨沙尘污染的影响,而不是西北方向的沙尘污染。
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Decoupling between circulation pattern and dust path since the last glacial in the Songnen Plain, NE China: Insights from quantitative provenance reconstruction of the Harbin dust sediments

Knowledge of the provenance of dust deposits in the easternmost margin of the Eurasian loess belt is essential for understanding the connection between circulation patterns and dust source-to-sink route in the Songnen Plain, NE China. Here, a total of 131 samples, from the loess-paleosol sequence since the last glacial (20) and the modern dust-storm sediments (7) in Harbin area together with potential dust source areas (104), were collected for elemental geochemical analysis to quantify the source apportionment and compare the performance of the Frequentist and Bayesian models. Fourteen geochemical properties (V, Zn, Ga, Sr, Mo, Ba, Pb, Y/Ta, MREEN/MREEN*, Th/Sc, Th/U, La/Sc, Zr/Hf and Co/Th) were selected as the optimum composite fingerprint after a range test, non-parametric Kruskal-Wallis H-test and stepwise discriminant function analysis. Based on both the models, the source contributions to the loess sequence and dust-storm deposits were in the following order: southwestern Songnen Sandy Land (57–95%, 49–97%), Horqin Sandy Land and Onqin Daga Sandy Land (2–43%, 0–31%), northwestern Songnen Sandy Land (0–21%, 0–20%) and Hulun Buir Sandy Land (0%, 0–8%). Following the goodness-of-fit and virtual mixtures, combined with root mean square error and mean absolute error, we argue that the Frequentist model is slightly more accurate than the Bayesian model in quantifying dust sources. The sandy lands figure importantly in acting as a dust transfer station. The comparison between the loess sequence and modern dust-storm source reconstructions reveals a decoupling between circulation pattern (northwesterly wind domination in the glacial) and dust path (dominantly southwestern direction), and small areas, high vegetation coverage and topographical barrier are considered to be the main reasons for the significantly limited dust emission in the NW-direction source area. Finally, the study highlights that improving land management practices in the SW-direction but not NW-direction sandy land may help ameliorate the effects of the Harbin dust pollution.

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来源期刊
Aeolian Research
Aeolian Research GEOGRAPHY, PHYSICAL-
CiteScore
7.10
自引率
6.10%
发文量
43
审稿时长
>12 weeks
期刊介绍: The scope of Aeolian Research includes the following topics: • Fundamental Aeolian processes, including sand and dust entrainment, transport and deposition of sediment • Modeling and field studies of Aeolian processes • Instrumentation/measurement in the field and lab • Practical applications including environmental impacts and erosion control • Aeolian landforms, geomorphology and paleoenvironments • Dust-atmosphere/cloud interactions.
期刊最新文献
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