Aeolian Research最新文献

Linking atmospheric circulation and Aeolian activity: The April 2025 dust storm in the Middle East 大气环流与风沙活动的联系：2025年4月中东沙尘暴

IF 3.4 3区地球科学 Q2 GEOGRAPHY, PHYSICAL

Aeolian Research

Pub Date : 2026-01-24 DOI: 10.1016/j.aeolia.2026.101035

Farahnaz Fazel-Rastgar, S.H. Mthembu

This study investigates the atmospheric dynamics and large-scale weather patterns behind the severe dust storm on April 14, 2025, which affected southeastern Iraq, Kuwait, and southwestern Iran. Using composite meteorological data, reanalysis datasets, and satellite observations, we identified a deep, cold-core cut-off low (COL) over the Eastern Mediterranean. This upper-level disturbance intensified and displaced the subtropical jet stream, enhancing upper-level divergence and atmospheric instability. These conditions promoted the development of a strong surface cyclone along the Persian trough, a key low-pressure zone in the Middle East. Interaction between the COL and the surface trough generated a strong meridional pressure gradient, producing a sharp, fast-moving cold front with steep temperature gradients and surface wind gusts exceeding 16 m/s. Near the tropopause, pronounced temperature and wind anomalies indicated strong baroclinicity and vertical momentum transfer, further increasing surface winds essential for dust uplift. The combination of these synoptic-scale features, dry soil, and turbulent boundary-layer mixing created ideal conditions for lifting and transporting large amounts of dust. Dust RGB satellite imagery revealed a large, comma-shaped dust plume across the region. This event highlights the crucial role of cold fronts, upper-level jet dynamics, and COL–surface interactions in triggering extreme dust storms in the arid Middle East. Understanding these atmospheric processes is essential for improving prediction and mitigating the environmental, health, and economic impacts of future dust events.

本研究探讨了2025年4月14日影响伊拉克东南部、科威特和伊朗西南部的严重沙尘暴背后的大气动力学和大尺度天气模式。利用综合气象数据、再分析数据集和卫星观测，我们确定了地中海东部的深部冷核切断低压（COL）。这一高空扰动增强并移位了副热带急流，增强了高空辐散和大气不稳定。这些条件促进了沿波斯槽（中东的一个关键低压区）的强地面气旋的发展。冷空气与地面槽的相互作用产生了较强的经向压力梯度，形成了一个尖锐、快速移动的冷锋，温度梯度较大，地面阵风超过16 m/s。在对流层顶附近，明显的温度和风异常表明了强烈的斜压性和垂直动量转移，进一步增加了地面风对沙尘上升至关重要。这些天气尺度的特征、干燥的土壤和湍流边界层的混合为提升和输送大量灰尘创造了理想的条件。RGB卫星图像显示了一个巨大的逗号形状的尘埃羽状物横跨该地区。这一事件凸显了冷锋、高空急流动力学和冷-地面相互作用在引发中东干旱地区极端沙尘暴中的关键作用。了解这些大气过程对于改善预测和减轻未来沙尘事件对环境、健康和经济的影响至关重要。

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引用次数: 0

Aligning loess with marine and lacustrine sedimentary record around 22.2 cal. kyr B.P. to explore the rapidity of atmospheric circulation change caused by the advance of the Eurasian ice-sheet cover 结合22.2 cal.kyr B.P.前后的海相和湖相沉积记录，探讨欧亚冰盖推进引起的大气环流变化的快速性

IF 3.4 3区地球科学 Q2 GEOGRAPHY, PHYSICAL

Aeolian Research

Pub Date : 2026-01-22 DOI: 10.1016/j.aeolia.2026.101034

Jerzy Nawrocki , Olga Rosowiecka , Tomasz Werner

To create credible time frames for two MIS2 loess sections in Central-Eastern Europe, the palaeosecular variation of geomagnetic field curves were elaborated and correlated with existing data from marine and lake sediments. They are benefiting from a more accurate geochronology and continuous sedimentation in water sediments compared to those in the loess. Previous research on the anisotropy of magnetic susceptibility in the loess of Central-Eastern Europe revealed a rapid transition from southern to northern katabatic winds approximately 22–22.7 kyr ago, coinciding with the advance of the Scandinavian Ice Sheet. Our new results indicate that at the Jarosław site, which is separated from the glacier foreland by a morphological ridge and located roughly 300 km from the ice sheet front, this change occurred within a span of no more than 30 years. In an open area, not surrounded by significant elevations, the onset of northern katabatic winds was preceded by a phase of intermediate winds that followed the southern winds, lasting about 110 years at the Korshiv “A” site. The northern winds began blowing approximately 22.2 cal. kyr B.P. in both localities. The beginning of the preceding southern winds aligns well with the end of Heinrich Stadial 2.

为了建立可信的中欧-东欧两个MIS2黄土剖面的时间框架，详细阐述了地磁场曲线的古长期变化，并与现有的海洋和湖泊沉积物数据进行了对比。与黄土沉积物相比，他们受益于更精确的地质年代学和水沉积物的连续沉积。以往对中欧-东欧黄土磁化率各向异性的研究表明，大约在22-22.7 kyr以前，从南风到北风的快速转变与斯堪的纳维亚冰盖的推进相一致。我们的新结果表明，在Jarosław站点，由形态山脊与冰川前陆分开，距离冰盖前缘约300公里，这种变化发生在不超过30年的时间内。在一个开阔的地区，周围没有明显的海拔，在北风开始之前，中风阶段紧随南风，在Korshiv“a”遗址持续了大约110年。北风开始在两个地方吹大约22.2英里/小时。前面的南风的开始与海因里希第2星的结束很好地对齐。

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引用次数: 0

Effect of relative humidity on the lifting of charged sand grains in an electric field 电场中相对湿度对带电沙粒抬升的影响

IF 3.4 3区地球科学 Q2 GEOGRAPHY, PHYSICAL

Aeolian Research

Pub Date : 2026-01-21 DOI: 10.1016/j.aeolia.2026.101033

Qiang Ma , Danyang Liu , Li Xie

In this paper, laboratory experiments of sand grains lifted by an electric field at different relative humidities were carried out. The electric field threshold, E_th, which is the lowest electric field that can lift sand grains in a relative humidity range of 10% to 80%, was experimentally obtained. The experimental results show that E_th decreases with increasing relative humidity for the given grain size, while it remains a constant when the relative humidity exceeds 60%. Based on the kinematics, it can be concluded that the inter-grain bonding forces exhibit the same trend in the relative humidity. An empirical formula of E_th is proposed, which is a function of the sand size and the relative humidity. By the trajectory image processing method, the charges of the lifted sand grains induced by the electric field were measured. It was found that the charges carried by an individual sand grain are independent of the relative humidity, and an empirical formula for the charges carried by an individual sand grain lifted by electrostatic force was obtained. The experimental method used in this paper is reproducible, and can be applied to investigate the dependence of charging characteristics and inter-grain bonding forces of other grains on relative humidity.

本文对不同相对湿度条件下电场对沙粒的抬升进行了室内实验。通过实验得到了在相对湿度为10% ~ 80%的条件下，能够提振沙粒的最低电场阈值Eth。实验结果表明，在一定的相对湿度下，Eth随相对湿度的增加而减小，当相对湿度超过60%时，Eth保持恒定。基于运动学分析，晶粒间结合力在相对湿度下表现出相同的趋势。提出了砂粒度与相对湿度的经验公式。采用轨迹图像处理方法，测量了电场作用下扬起砂粒的电荷。结果表明，单个沙粒携带的电荷与相对湿度无关，并得到了静电力作用下单个沙粒携带电荷的经验公式。本文采用的实验方法重复性好，可用于研究其他颗粒的电荷特性和颗粒间结合力对相对湿度的依赖关系。

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引用次数: 0

The Ibex dune field of Death Valley National Park, California: Characterization and assessment for Use as a Martian analog 加州死亡谷国家公园的野山羊沙丘场：作为火星模拟物的特征和评估

IF 3.4 3区地球科学 Q2 GEOGRAPHY, PHYSICAL

Aeolian Research

Pub Date : 2026-01-13 DOI: 10.1016/j.aeolia.2026.101032

Jordan M. Bretzfelder , Mackenzie Day , Marina O. Argueta , Michael R. Zanetti , James R. Zimbelman , BreeAnn Getman , Jacob Widmer , Seulgi Moon , Kyle Miller , Christopher Whetsel

Earth analogs have become increasingly valuable in efforts to expand our understanding of aeolian (wind-driven) activity dominating the surface of modern-day Mars. These sites enable in-situ access for researchers and equipment, and facilitate investigations that are beyond the scope of the landed Mars missions. As the climate on modern Mars is extremely arid and devoid of vegetation, analog environments on Earth are often in remote and inhospitable environments (i.e., the Argentinian Puna and Antarctic Dry Valleys), which can make research at the sites logistically and physically challenging. However, within Death Valley National Park, which is comparably very accessible, and is the driest place in North America, lies the under-studied Ibex Dune field. This area hosts a variety of bedforms of different scales in close proximity, comparable to many areas on the Martian surface, and thus presents a novel morphologic analog for the poorly understood decimeter – meter scale bedforms on Mars, including: transverse aeolian ridges, large Martian ripples, and megaripples. Here, we discuss the dynamic Ibex Dune Field system, specifically: (1) bedform morphologies and migration patterns within the site, (2) the sand mineralogy and possible provenance, (2) the dune field age and evolution, (3) current wind patterns at the site, (4) applicability to Mars, and (5) the limitations of such an analog system.

地球上的类似物在扩大我们对主导现代火星表面的风成（风驱动）活动的理解方面变得越来越有价值。这些站点为研究人员和设备提供了现场访问，并促进了超出登陆火星任务范围的调查。由于现代火星上的气候极其干旱，没有植被，地球上的模拟环境通常是在偏远和不适宜居住的环境中（即阿根廷的普纳和南极干谷），这使得在这些地点进行研究在后勤和物理上都具有挑战性。然而，在死亡谷国家公园内，相对来说很容易到达，是北美最干燥的地方，有一个未被研究的野山羊沙丘。该区域拥有各种不同尺度的近距离地形，可与火星表面的许多地区相媲美，因此为火星上鲜为人知的分米尺度地形提供了一种新的形态模拟，包括：横向风成脊，大火星波纹和巨涟漪。在这里，我们讨论了动态Ibex沙丘场系统，具体包括：(1)场地内的床状形态和迁移模式，(2)砂矿物学和可能的物源，(2)沙丘场的年龄和演化，(3)场地当前的风型，(4)对火星的适用性，以及(5)这种模拟系统的局限性。

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引用次数: 0

A high-accuracy stacking model for automatic identification of aeolian saltating tracks in high-speed pictures 一种用于高速图像中风成跳跃轨迹自动识别的高精度叠加模型

IF 3.4 3区地球科学 Q2 GEOGRAPHY, PHYSICAL

Aeolian Research

Pub Date : 2026-01-09 DOI: 10.1016/j.aeolia.2026.101031

Mengjie Pu , Fanmin Mei , Chuan Lin , Mingjun Sui , Hongda Chen , Shenyang He , Weikai Wang , Chang Zhou , Jin Su , Jinguang Chen

While automatic track identification in high-speed images is essential for scaling up the analysis of aeolian saltation, published individual machine learning models lack the necessary generalization capabilities, primarily due to the scarcity of large-scale training datasets. To enhance the generalization of machine learning models in saltating track recognition, we established a representative dataset with more than 10,000 tracks, more variables for characterizing track features, and a balanced proportion of true and false tracks using the Synthetic Minority Over-sampling Technique (SMOTE). Furthermore, we propose a stacking model for the automatic classification of saltating tracks, which consists of Categorical Boosting (CatBoost), Extra Trees (ET), Light Gradient Boosting Machine (LGBM), and eXtreme Gradient Boosting (XGBoost) as the base models, along with the Random Forest (RF) as the meta-learner. Leveraging the comprehensive D5fs dataset, our stacking model attains state-of-the-art performance with an accuracy of ∼ 0.93 and an area under the receiver operating characteristic curve (AUC) of ∼ 0.98, confirming its robustness and exceptional generalization performance compared to individual ensemble models. Our study not only establishes a robust and interpretable machine-learning framework for the automatic detection of saltating tracks but also provides a potent tool for the classification of incident, rebound, and ejected trajectories. Ultimately, this work paves the way for a deeper understanding of saltation dynamics leveraging massive datasets.

虽然高速图像中的自动轨迹识别对于扩大风沙跃动分析至关重要，但已发布的单个机器学习模型缺乏必要的泛化能力，这主要是由于缺乏大规模训练数据集。为了增强机器学习模型在跳跃轨迹识别中的泛化性，我们建立了一个具有代表性的数据集，该数据集包含超过10,000个轨迹，更多的变量用于表征轨迹特征，并使用合成少数派过采样技术（SMOTE）平衡真轨迹和假轨迹的比例。此外，我们提出了一种用于跃变轨道自动分类的叠加模型，该模型由CatBoost （CatBoost）、Extra Trees （ET）、Light Gradient Boosting Machine （LGBM）和eXtreme Gradient boost （XGBoost）作为基本模型，以及Random Forest （RF）作为元学习器组成。利用全面的D5fs数据集，我们的叠加模型获得了最先进的性能，精度为~ 0.93，接收者工作特征曲线（AUC）下面积为~ 0.98，与单个集成模型相比，证实了其鲁棒性和卓越的泛化性能。我们的研究不仅为弹跳轨迹的自动检测建立了一个强大的、可解释的机器学习框架，而且还为事件、反弹和弹出轨迹的分类提供了一个强有力的工具。最终，这项工作为利用大量数据集更深入地了解跃迁动力学铺平了道路。

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引用次数: 0

The Sand AbrasioN Device for Aeolian Research (SANDAR): A new experimental device for investigating how wind transport affects sand on Earth and Mars 风成研究用沙磨损装置（SANDAR）：一种用于研究风在地球和火星上如何影响沙的新型实验装置

IF 3.4 3区地球科学 Q2 GEOGRAPHY, PHYSICAL

Aeolian Research

Pub Date : 2026-01-05 DOI: 10.1016/j.aeolia.2025.101027

Anna E. Baker , Devon M. Burr , Rachel L. Fry , Joshua P. Emery , Mark J. Loeffler

On Earth and Mars, aeolian transport causes sand grains to become abraded, resulting in mineralogic and textural changes. Understanding how sands evolve, or mature, with transport via experimental studies is important for understanding the origins, geologic history, and cycling of sediments, as well as dust production. Previous experimental works have used a variety of methods to simulate aeolian transport in the laboratory, but practical limitations and similitude concerns have limited such research. Here, we present and validate the Sand AbrasioN Device for Aeolian Research (SANDAR), a modified air mill that uses pressurized air to circulate sand around a small abrasion chamber, simulating the effects of aeolian transport. This device is re-circulating to simulate long-distance transport, and it allows for repeated analyses of well-constrained sediment samples, revealing their evolution over time. It is compatible with the grain sizes (74–500 μm) and grain impact velocities (∼0.6–3.7 m/s) typically expected for natural aeolian environments, and is also adaptable for diverse applications simulating different wind conditions. We show that the SANDAR achieves similitude of kinetic energy with respect to saltating sand on both Earth and Mars. SEM and optical microscope imaging reveal that the SANDAR produces microtextures on the surfaces of sand grains similar to those found with natural aeolian transport, demonstrating that it effectively simulates the mechanical effects of aeolian processes. Thus, the SANDAR is a valid tool for use in experimental research to improve our understanding of sedimentary processes across the Solar System.

在地球和火星上，风沙运输导致沙粒被磨损，导致矿物学和质地的变化。通过实验研究了解沙粒是如何演化或成熟的，这对于了解沉积物的起源、地质历史、循环以及粉尘的产生非常重要。以前的实验工作已经使用了多种方法在实验室模拟风成输运，但实际的局限性和相似性问题限制了这类研究。在这里，我们提出并验证了用于风成研究的沙子磨损装置（SANDAR），这是一种改进的空气磨机，它使用加压空气在一个小磨损室周围循环沙子，模拟风成输送的影响。该设备可用于模拟长途运输，并允许对约束良好的沉积物样本进行重复分析，揭示其随时间的演变。它与自然风成环境中通常预期的颗粒尺寸（74-500 μm）和颗粒冲击速度（~ 0.6-3.7 m/s）兼容，并且也适用于模拟不同风条件的各种应用。我们表明，SANDAR在地球和火星上都实现了与沙土相似的动能。SEM和光学显微镜成像显示，SANDAR在沙粒表面产生的微观纹理与自然风成过程中发现的相似，表明它有效地模拟了风成过程的机械效应。因此，SANDAR是用于实验研究的有效工具，可以提高我们对整个太阳系沉积过程的理解。

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引用次数: 0

A dynamically consistent model for dust-devil-like flows 沙尘暴样气流的动态一致模型

IF 3.4 3区地球科学 Q2 GEOGRAPHY, PHYSICAL

Aeolian Research

Pub Date : 2026-01-03 DOI: 10.1016/j.aeolia.2025.101030

Sanjay Kumar Pandey, Kriti Yadav

A generalized analytical model for dust devils with a central low-pressure core is presented in this work. The model incorporates a modified stream function that enables the flow field to satisfy physically relevant boundary conditions and capture essential vortex features, including finiteness of width and off-axis velocity maxima. All three velocity components — radial, axial, and azimuthal — are derived for steady, incompressible, and axisymmetric inviscid flows. An adjustable shape parameter allows the model to flexibly represent varying vortex intensities and core sharpness. Analytical expressions for velocity and pressure distribution are obtained and analysed. The structure predicted from the model is consistent with field observations, including transition from inflow to outflow with height, decay of rotational motion aloft, and confinement of the vortex within a finite periphery. Comparisons with classical vortex models highlight the improved physical realism of the present formulation. Inside the low-pressure core, the radial and azimuthal velocities reverse the direction relative to the outer flow (though vanishing small in magnitude), ensuring they vanish at the core interface and the axis as well.

本文提出了一种具有中心低压核的尘卷的广义解析模型。该模型包含了一个改进的流函数，使流场能够满足物理上相关的边界条件，并捕获基本的涡特征，包括宽度和离轴速度最大值的有限性。所有三个速度分量——径向、轴向和方位角——都是为稳定的、不可压缩的和轴对称的无粘流导出的。可调节的形状参数允许模型灵活地表示不同的漩涡强度和核心锐度。得到并分析了速度和压力分布的解析表达式。模型预测的结构与现场观测一致，包括从流入到流出随高度的转变，高空旋转运动的衰减，以及涡在有限外围的限制。与经典涡模型的比较突出了本公式的物理真实感的改进。在低压堆芯内部，径向和方位角速度与外部流动的方向相反（尽管消失的幅度很小），确保它们在堆芯界面和轴上也消失。

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引用次数: 0

The origin of loess microstructure: 3D insights from initial aeolian dust packing 黄土微观结构的起源：从初始风沙堆积的三维洞察

IF 3.4 3区地球科学 Q2 GEOGRAPHY, PHYSICAL

Aeolian Research

Pub Date : 2025-12-30 DOI: 10.1016/j.aeolia.2025.101029

Weiwei Zhang , Yanrong Li , Jianguo Zheng , Yongtang Yu , Xin Huang , Jianmin Zhu

Aeolian deposition is fundamental to the formation of the porous structure of present-day loess. However, the true initial packing structure of loess dust remains poorly understood. In this study, we reconstructed initial loess deposits by simulating the dust deposition process, using Malan loess, which is compositionally analogous to ancient dust, as the raw material. The microstructure of the simulated deposits was characterised using micro-computed tomography (μ-CT) scanning and compared with that of natural Malan loess. The results indicate that the initial loess deposits possessed an exceptionally loose particle packing, with void ratios ranging from 2.79 to 3.75. Loose clay or silt–clay aggregates formed extensively due to inter-particle forces (such as van der Waals force and electrostatic attraction) during deposition. These aggregates, along with isolated detrital particles, acted as the primary skeletal components. Surface clays on skeletal particles play a critical role in bonding adjacent particles, which is essential for establishing and stabilising the loose framework. Notably, the initial deposits with an intermediate clay content (23%) among the samples studied exhibited the loosest microstructure, featuring chain-like particle packing and abundant large overhead pores. The initially loose aggregates and open packings compact over geological time while retaining structural inheritance, resulting in the reduced but partially preserved pore space that shapes the microstructure of present-day loess. This study provides the first direct 3D visualisation and quantification of the initial particle-scale microstructure, offering a key reference for understanding subsequent post-depositional processes and associated geomechanical properties.

风成沉积是现今黄土多孔结构形成的基础。然而，人们对黄土粉尘的真实初始堆积结构仍知之甚少。本研究以成分与古沙尘相似的马兰黄土为原料，通过模拟沙尘沉积过程，重建了初始黄土沉积。利用微计算机断层扫描（μ-CT）对模拟沉积物的微观结构进行了表征，并与天然马兰黄土的微观结构进行了对比。结果表明：黄土初始沉积具有异常松散的颗粒堆积，孔隙比在2.79 ~ 3.75之间；在沉积过程中，由于粒子间的作用力（如范德华力和静电吸引），松散粘土或粉质粘土聚集体广泛形成。这些聚集体，连同孤立的碎屑颗粒，构成了主要的骨骼成分。骨架颗粒表面的粘土对相邻颗粒的粘接起着关键作用，这对松散骨架的建立和稳定至关重要。值得注意的是，粘土含量中等（23%）的初始沉积物的微观结构最松散，具有链状颗粒堆积和丰富的大顶孔。最初松散的团聚体和开放的填料随着地质时间的推移变得紧密，同时保留了结构的遗传，导致孔隙空间减少，但部分保留了孔隙空间，形成了当今黄土的微观结构。该研究首次提供了初始颗粒尺度微观结构的直接三维可视化和量化，为理解后续沉积后过程和相关的地质力学性质提供了关键参考。

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引用次数: 0

Bidirectional aeolian erosion controls the spatial variations of yardang landforms in Dunhuang yardang National Geopark, Northwestern China 敦煌雅丹国家地质公园双向风蚀控制着雅丹地貌的空间变化

IF 3.4 3区地球科学 Q2 GEOGRAPHY, PHYSICAL

Aeolian Research

Pub Date : 2025-12-23 DOI: 10.1016/j.aeolia.2025.101028

Yongchong Lin , Chunyao Wu , Guijin Mu , Jifeng Zhang , Cong Zhao

Yardang fields in arid environments typically exhibit morphological consistency under unidirectional winds. However, the yardangs in Dunhuang Yardang National Geopark in NW China display striking spatial variations—a decades-long paradox unresolved by existing fluvial or aeolian erosion models. To resolve this paradox, we integrated geomorphic mapping, GIS morphometrics (1,000 + yardangs across 5 sub-areas), analysis of micro-erosion features, and regional wind-field validation. Our results demonstrate the aeolian origin of southern yardangs through diagnostic east–west linear textures and echo dunes, refuting dominant fluvial hypotheses. Critically, R-value (length-to-width ratio) gradients decrease southward (from 4.7 to 1.6) and also westward (from 3.1 to 1.6), reaching minima in the central transition zone under synergistic intensification by northerly and easterly winds. Uniform lithology, negligible topography, as confirmed by DEM data, and precipitation patterns exclude non-aeolian controls. Hence, we propose a bidirectional aeolian erosion gradient model: primary winds shape yardang elongation while secondary crosswinds drive fragmentation along spatial vectors. This mechanism, validated against analogues in the Qaidam Basin, advances our understanding of yardang evolution in multidirectional wind regimes. By establishing bidirectional wind erosion as the key driver, our study explains the exceptional morphological diversity of the Dunhuang Geopark, providing the scientific foundation for its unique geotourism appeal.

干旱环境下的雅塘田在单向风作用下表现出典型的形态一致性。然而，敦煌雅塘国家地质公园的雅塘呈现出显著的空间变化，这是一个长达数十年的悖论，现有的河流或风蚀模型无法解决。为了解决这一矛盾，我们整合了地貌测绘、GIS形态计量学（跨越5个子区域的1000多个yardangs）、微侵蚀特征分析和区域风场验证。我们的研究结果通过诊断的东西线状结构和回声沙丘证明了南雅当的风成成因，反驳了主流的河流假说。重要的是，r值（长宽比）梯度向南（从4.7降至1.6）和向西（从3.1降至1.6）减小，在北风和东风的协同增强下，在中央过渡区达到最小值。均匀的岩性、可忽略的地形（由DEM数据证实）和降水模式排除了非风成因素的控制。因此，我们提出了一个双向风蚀梯度模型：一次风形成尺度延伸，而次侧风沿着空间矢量驱动破碎。通过对柴达木盆地类似物的验证，进一步加深了我们对多向风场尺度演化的认识。以双向风蚀为主要驱动因素，解释了敦煌地质公园独特的形态多样性，为其独特的地质旅游吸引力提供了科学依据。

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引用次数: 0

Using non-combustible residual particles as a proxy for mineral dust deposition to estimate its contribution to light absorption in the 300-year Holtedahlfonna ice core 利用不可燃残余颗粒作为矿物粉尘沉积的代表，估计其对300年霍尔特达尔丰纳冰芯光吸收的贡献

IF 3.4 3区地球科学 Q2 GEOGRAPHY, PHYSICAL

Aeolian Research

Pub Date : 2025-12-18 DOI: 10.1016/j.aeolia.2025.101025

Johan Ström , Jonas Svensson , Emilie Beaudon , Ilpo Marja-Aho , Meri M. Ruppel

Whereas residual light-absorbing particles remaining after combustion are taken as proxy for mineral dust, light-absorbing particles removed by combustion in the thermal-optical analysis are attributed to carbonaceous material. The latter is assumed to mainly be composed of black carbon. The temporal evolution of residual particles observed in a Svalbard ice core (Holtedahlfonna), covering the period 1700 to 1998, shows strong relations with the reanalyzed local temperature and wind data. This indicates possible local sources for the mineral dust proxy. The relative contribution to light attenuation caused by residual particles prior to 1875 is in the range 0.2 to 0.5. After 1875 the contribution is generally above 0.4 with a maximum of about 0.7 in the middle of the 20th century. The increasing fraction in the beginning of the 20th century is attributed to enhanced emission of local mineral dust due to increased local summertime wind speeds. The decrease in the relative contribution follows a lowering in the wind speed and a concurrent increase in the deposition of BC from about the 1970′s. Enhanced light attenuation in the red wavelength not explained by the MD and BC proxies remains a conundrum but show clear covariations with positive monthly mean summer temperatures above zero and non-sea salt K⁺ ions.

在热光学分析中，将燃烧后残留的吸光颗粒作为矿物粉尘的代表物，将燃烧去除的吸光颗粒归为碳质物质。后者被认为主要由黑碳组成。在斯瓦尔巴德冰芯（Holtedahlfonna）中观测到的残留粒子的时间演变，覆盖了1700年至1998年，显示出与重新分析的当地温度和风数据有很强的关系。这表明矿物粉尘代理的可能本地来源。1875年以前残留粒子对光衰减的相对贡献在0.2 ~ 0.5之间。1875年以后，贡献率一般在0.4以上，20世纪中叶达到最大值，约为0.7。20世纪初增加的部分归因于由于当地夏季风速增加而增加的当地矿物粉尘排放。相对贡献的减少是由于大约从20世纪70年代开始，风速降低，同时BC沉积增加。不能用MD和BC代用物解释的红光波长的光衰减增强仍然是一个难题，但与夏季月平均气温高于零和非海盐K+离子呈正相关。

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引用次数: 0