Vegetated Linear Dunes (VLDs) are elongated dunes whose construction is controlled by vegetation and wind. Common in southern hemisphere drylands, they were mainly active in the late Pleistocene. VLDs vertically accumulate sand during elongation episodes and their internal stratigraphy thus serves as a proxy for major periods of strong winds. However, the framework of VLD buildup and elongation is constrained by low-resolution luminescence chronology. To overcome this gap this study applies high-resolution Portable Optically Stimulated Luminescence (POSL) profiling coupled with OSL dating and sedimentology of an exposed VLD section, combined with successive sections along a fluvially truncated downwind elongation trace of the dune at the margin of the stabilized northwestern Negev dunefield, Israel.

POSL profiling of the VLD section revealed three statistically distinct stratigraphic units. Winnowing of very fine sand and silt grains can explain a higher ratio between quartz and heavy minerals in the upper VLD unit. This winnowing decreased dose rates and, consequently, reduced bulk POSL luminescence signals and D_e values in the upper unit. The two upper units of the VLD section date to the Younger Dryas while the basal unit dates to the Heinrich-1 event. OSL ages at the lower unit and at the section bases along the downwind elongation trace of the dune indicate initial elongation during the Heinrich-1 event, and even prior. The study demonstrates that beyond delineating accumulation stages and assigning stratigraphic units, POSL is a sensitive sensor of sedimentological and mineralogical differences within a dune profile, enabling correlation with OSL measurements.

植被线性沙丘（VLD）是细长的沙丘，其结构受植被和风的控制。它们常见于南半球旱地，主要活跃于更新世晚期。VLD在延伸过程中垂直积聚沙土，因此其内部地层可作为大风期间的代表。但是，VLD形成和伸长的框架受到低分辨率发光年表的约束。为了克服这一差距，本研究应用了高分辨率便携式光学激发发光（POSL）剖析，结合OSL测年和裸露VLD断面的沉积学特征，并结合了沙丘在稳定边缘的顺风截断顺风伸长轨迹的连续断面西北内盖夫·杜内菲尔德，以色列。

VLD剖面的POSL分析显示出三个统计上不同的地层单位。对非常细的沙子和粉砂颗粒进行风选可以解释上部VLD单元中石英与重矿物之间更高的比率。这种风吹减少了剂量率，因此减少了整体POSL发光信号和D _e上部单元中的值。VLD部分的两个较高单位可追溯到Younger Dryas，而基础单位可追溯到Heinrich-1事件。沿沙丘的顺风延伸迹线的下部单元和剖面基部的OSL年龄表明，在Heinrich-1事件期间甚至在此之前的初始延伸。该研究表明，除了描述堆积阶段和分配地层单位外，POSL是沙丘剖面内沉积学和矿物学差异的灵敏传感器，可与OSL测量相关。