Data underlying the publication: Subaqueous resetting of the luminescence clock: bleaching of sand-sized quartz and feldspar in coastal waters

This dataset documents a one-day field experiment that quantified how daylight resets luminescence signals of sand-sized quartz and feldspar grains in turbid, tidal-inlet waters. Sand samples were exposed in situ at multiple depths in a tidal inlet while concurrent measurements of underwater light spectra and suspended sediment concentration (SSC) were collected. Single-grain luminescence analyses show a clear, depth-dependent bleaching pattern: a shallow zone where grains bleach within a day and a deeper “bleaching front” below which no significant resetting occurred during the experiment. The observed bleaching depths correspond with predictions made from the measured subaqueous light spectra and mineral-specific photo-ionization behavior.<br>The dataset includes:<br>Raw and processed single-grain luminescence data for quartz and feldspar (raw reader files and derived signal data).In-situ light spectra recorded throughout the exposure.OBS turbidity records and calibrated suspended sediment concentration (SSC) profiles, with the calibration file.Metadata describing sample locations, exposure depths, and timing.All data-processing scripts (R and MATLAB) and commented analysis code used to extract signals, convert turbidity to SSC, and produce figures and tables.Figures and tables generated from the analysis.<br>Instruments and provenance: luminescence measurements were produced using Netherlands Centre for Luminescence Dating (NCL) equipment; SSC and calibration protocol is described in the manuscript following standard protocols. Background and sample information is available via the NCL database under project code NCL-1123. For more information see README file.<br>This dataset supports coastal sediment transport studies, luminescence dating and tracing applications, validation of subaqueous bleaching models, and development of sensor-based SSC estimation methods.

本数据集记录了一项为期一天的野外实验，量化了浑浊潮汐水道内日光对砂级石英与长石颗粒发光信号的重置作用。研究团队将砂样在潮汐水道的多个深度开展原位暴露实验，同时同步采集水下光谱与悬浮泥沙浓度（SSC）的实测数据。单颗粒发光分析结果呈现出清晰的深度依赖性漂白模式：其中包含一个浅表层区域，该区域内的颗粒可在一天内完成漂白；以及一个更深的‘漂白锋面’，实验期间锋面下方未发生显著的信号重置。观测得到的漂白深度与基于实测水下光谱和矿物特异性光电离行为得到的预测结果高度吻合。

本数据集包含以下内容：
1. 石英与长石的单颗粒发光原始数据及处理后数据（含原始读数文件与衍生信号数据）；
2. 暴露全程记录的原位水下光谱数据；
3. OBS浊度记录与经过校准的悬浮泥沙浓度剖面数据，附带校准文件；
4. 记录采样点位、暴露深度与暴露时序的元数据；
5. 用于信号提取、浊度转换为悬浮泥沙浓度、生成图表与表格的所有数据处理脚本（R语言与MATLAB语言）及带注释的分析代码；
6. 基于分析结果生成的图表与表格。

仪器与数据来源：发光测量采用荷兰发光测年中心（Netherlands Centre for Luminescence Dating, NCL）的设备完成；悬浮泥沙浓度测量与校准流程遵循行业标准规范，相关细节详见配套研究手稿。背景信息与样品详情可通过NCL数据库以项目代码NCL-1123查询获取，更多细节请参阅README文件。

本数据集可用于海岸泥沙输运研究、发光测年与示踪应用、水下漂白模型验证，以及基于传感器的悬浮泥沙浓度估算方法开发。