Surface Nuclear Magnetic Resonance (NMR) Soundings on Drained Lake Basins, North Slope, Alaska, 2015-2016

This dataset contains surface nuclear magnetic resonance (NMR) geophysical soundings acquired on five drained lake basins and two control sites on terrestrial upland permafrost (primary surface sites) during spring fieldwork 2015 - 2016. Measurements were made using a Vista Clara GMR (Mukilteo, Washington, Unites States of America) with a circle coincident transmitter/receiver loop either 75 meters (m) or 90 m diameter. Raw data for nine soundings are provided in the proprietary format created by the instrument, and results after processing and inversion with the GMR software (Mukilteo, Washington, Unites States of America; Walsh, 2008) are included as tabular values. The purpose of this research is to identify unfrozen bodies or taliks below drained lake basins to better understand the process of permafrost aggradation after lake drainage. Surface NMR is the only non-invasive geophysical method that is able to directly detect unfrozen water as it measures the response of hydrogen protons on liquid water (Walsh, 2008). Walsh, D. O. (2008). Multi-channel surface NMR instrumentation and software for 1D/2D groundwater investigations. Journal of Applied Geophysics, 66(3–4), 140–150. https://doi.org/10.1016/j.jappgeo.2008.03.006

本数据集包含2015-2016年春季野外作业期间，在陆地高地多年冻土区的5个疏干湖盆与2个对照样地（核心地表测点）采集的地面核磁共振（surface nuclear magnetic resonance, NMR）地球物理探测数据。探测采用产自美国华盛顿州姆基尔特奥（Mukilteo）的Vista Clara GMR仪器，搭配直径为75米（m）或90米的共发射接收线圈。9组探测的原始数据以该仪器自带的专有格式提供，同时附带经GMR软件（美国华盛顿州姆基尔特奥；Walsh, 2008）处理与反演后的结果，以表格数值形式呈现。本研究旨在识别疏干湖盆下方的未冻体或融穿通道（taliks），以深入理解湖盆疏干后多年冻土的加积过程。地面核磁共振是唯一可直接探测未冻水的非侵入式地球物理方法，其原理为通过测量液态水中氢质子的响应（Walsh, 2008）。Walsh, D. O. (2008). 用于一维/二维地下水调查的多通道地面核磁共振仪器与软件. 应用地球物理学杂志, 66(3–4), 140–150. https://doi.org/10.1016/j.jappgeo.2008.03.006