High-Resolution Repeat Topography of Drifting Ice Floes in the Arctic Ocean from Terrestrial Laser Scanning Collected on the Multidisciplinary drifting Observatory for the Study of Arctic Climate Expedition

Data are available for download at: https://arcticdata.io/data/10.18739/A26688K9D/ Many processes involving the fluxes of mass, energy, and momentum in Arctic sea ice impact and are impacted by the snow and ice topography. We conducted 42 days of measuring the snow and ice topography on approximately a 0.5 km squared drifting parcel of Arctic sea ice from 18 October 2019 to 9 May 2020 via Terrestrial Laser Scanning (TLS) on the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) expedition. We have aligned the TLS data into an ice-fixed, lagrangian reference frame such that topographic changes (e.g. snow accumulation) can be observed on some ice floes for time periods up to six months. Using in-situ measurements, we have validated the vertical accuracy of the alignment to within a 95% confidence interval of plus or minus 0.011 m. These data can be used to investigate snow accumulation and redistribution, ice dynamics, surface roughness, and they can provide invaluable context for many other co-located measurements. These measurements were made as part of the snow and ice team work at MOSAiC. For an overview of all snow and ice team work please see: https://doi.org/10.1525/elementa.2021.000046. Additionally, a data descriptor paper providing additional details, figures, and tables related to this dataset will be published following publication of this dataset. This dataset supersedes https://doi.org/10.18739/A25717P9Q, https://doi.org/10.18739/A2901ZH4K, and https://doi.org/10.18739/A2DR2P98D. This dataset contains all information in those prior datasets and has superior alignment quality.

本数据集可通过以下链接下载：https://arcticdata.io/data/10.18739/A26688K9D/
北极海冰中涉及质量、能量与动量通量的诸多过程，既会影响积雪与冰面地形，同时也会受到积雪和冰面地形的反作用。2019年10月18日至2020年5月9日，研究团队在北极气候多学科漂移观测站（Multidisciplinary drifting Observatory for the Study of Arctic Climate, MOSAiC）科考计划中，针对一块面积约0.5平方千米的北极海冰漂移浮体，采用地面激光扫描（Terrestrial Laser Scanning, TLS）技术开展了为期42天的积雪与冰面地形测量工作。我们将地面激光扫描数据对齐至冰面固定的拉格朗日参考框架，从而可在部分海冰浮体上观测长达六个月的地形变化（如积雪累积过程）。通过原位测量，我们将该对齐流程的垂直精度验证至95%置信区间内的±0.011米。本数据集可用于积雪累积与再分布、冰动力学过程、地表粗糙度等方向的研究，同时可为众多其他同位置测量提供极为宝贵的背景参考依据。本次测量工作是MOSAiC科考计划积雪与冰面研究团队的工作成果之一。如需了解该团队全部工作的概况，请参阅：https://doi.org/10.1525/elementa.2021.000046。此外，一篇详细阐述本数据集的相关数据说明论文，将在本数据集正式发布后刊出。本数据集取代了此前的https://doi.org/10.18739/A25717P9Q、https://doi.org/10.18739/A2901ZH4K以及https://doi.org/10.18739/A2DR2P98D三个数据集，包含了上述旧数据集的全部信息，且对齐质量更优。