Vegetation Warming Experiment: Thaw Depth and dGPS locations, Barrow, Alaska, 2018

Thaw depth measurements within and around warming chambers, and at ambient plots. Measurements were taken at the start and end of chamber deployment, and two intermediate times during the 2018 growth season. dGPS measurements of chamber and ambient plot locations. This dataset contains one kmz, two xlsx, and three csv files where the xlsx files have been preserved as csvs for preservation. These data were collected as part of a series of single-season warming experiments on tundra vegetation on the Barrow Environmental Observatory (BEO), Utqiagvik, Alaska. A different plant species was targeted each year, over four experimental years from 2017–2021. Each year, five warming chambers and paired ambient control plots were deployed from around the time of snowmelt in mid-June through to mid-September. Average seasonal warming of 3-4°C was achieved using Zero Power Warming (ZPW) chambers (Lewin et al, 2017).The Next-Generation Ecosystem Experiments: Arctic (NGEE Arctic), was a research effort to reduce uncertainty in Earth System Models by developing a predictive understanding of carbon-rich Arctic ecosystems and feedbacks to climate. NGEE Arctic was supported by the Department of Energy's Office of Biological and Environmental Research. The NGEE Arctic project had two field research sites: 1) located within the Arctic polygonal tundra coastal region on the Barrow Environmental Observatory (BEO) and the North Slope near Utqiagvik (Barrow), Alaska and 2) multiple areas on the discontinuous permafrost region of the Seward Peninsula north of Nome, Alaska. Through observations, experiments, and synthesis with existing datasets, NGEE Arctic provided an enhanced knowledge base for multi-scale modeling and contributed to improved process representation at global pan-Arctic scales within the Department of Energy's Earth system Model (the Energy Exascale Earth System Model, or E3SM), and specifically within the E3SM Land Model component (ELM).

本数据集涵盖增温箱内部、周边及对照样地的解冻深度测量数据，以及增温箱与对照样地位置的差分GPS（Differential GPS）测量数据。其中解冻深度测量分别于增温箱布设始末，以及2018年生长季的两个中间时间节点开展。本数据集包含1个KMZ文件、2个XLSX文件及3个CSV文件，为便于长期保存，原XLSX文件已转换为CSV格式留存。
这些数据采自阿拉斯加州乌特恰维克市巴罗环境观测站（Barrow Environmental Observatory, BEO）开展的一系列苔原植被单季增温实验。2017至2021年的4个实验年度中，每年均针对不同的植物物种开展实验。每年于6月中旬融雪前后至9月中旬期间，布设5台增温箱及对应的配对对照样地，实验采用无动力增温箱（Zero Power Warming, ZPW, Lewin等, 2017）实现了3~4℃的季节平均增温幅度。
下一代北极生态系统实验（Next-Generation Ecosystem Experiments: Arctic, NGEE Arctic）是一项旨在通过深化对富碳北极生态系统及其气候反馈机制的预测性认知，降低地球系统模型不确定性的研究项目，由美国能源部生物与环境研究办公室资助。该项目设有两个野外研究站点：1）位于阿拉斯加州乌特恰维克（原巴罗）附近北坡的巴罗环境观测站（BEO）内的北极多边形苔原沿海区域；2）阿拉斯加州诺姆以北苏厄德半岛的不连续多年冻土区的多个区域。通过观测、实验以及与现有数据集的综合分析，NGEE Arctic为多尺度建模提供了更为完善的知识库，并推动了美国能源部地球系统模型（能源极端尺度地球系统模型，Energy Exascale Earth System Model, E3SM），尤其是其陆面模型模块（E3SM Land Model, ELM）在全球泛北极尺度下的过程表征精度提升。