Volumetric Soil Moisture Measurements at the Teller 27 Site, Seward Peninsula, Alaska, 2022-2023

The Teller 27 watershed on the Seward Peninsula, Alaska, has been well characterized by the NGEE Arctic project. The study site is underlain by discontinuous permafrost that is thawing as the climate warms. As a result, the site is experiencing a short-term wetting trend as a perched water table above the remaining permafrost provides plant available water during the growing season. Soil moisture patterns drive microbial activity and plant species compositions including plant density and height. This study aimed to understand how soil moisture patterns were influenced by tundra microtopography. To accomplish this, we placed a strategic network of soil moisture sensors in micro-highs, micro-lows, and control areas under different vegetation types within the Teller 27 watershed from summer of 2022 through fall of 2023. This data was used in conjunction with other soil data from the Teller 27 watershed to gain a more comprehensive understanding of soil moisture patterns in a rapidly thawing discontinuous permafrost region. This dataset includes six *.csv files: four of time series soil moisture data, one of field soil moisture data, and one of site conditions. The dataset also includes one *.kml file of the watershed and the soil moisture sensor sites as well as this user guide to provide details on data collection and processing methods. NGEE Arctic Project Summary 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).

阿拉斯加苏厄德半岛的Teller 27流域已由NGEE Arctic项目进行了全面表征。研究区地下分布着不连续多年冻土（permafrost），随着气候变暖正逐渐消融。结果，由于剩余冻土上方的滞水层（perched water table）在生长季为植物提供可利用水分，该区域正经历短期湿润趋势。土壤水分格局驱动微生物活动和植物物种组成，包括植物密度和高度。本研究旨在探究冻土苔原微地形（tundra microtopography）如何影响土壤水分格局。为此，我们于2022年夏季至2023年秋季在Teller 27流域内不同植被类型下的微高地（micro-highs）、微洼地（micro-lows）及对照区域布设了土壤水分传感器战略网络。这些数据与Teller 27流域的其他土壤数据结合使用，以更全面地理解快速消融的不连续多年冻土区的土壤水分格局。本数据集包含6个*.csv文件：4个为土壤水分时间序列数据，1个为野外土壤水分数据，1个为站点条件数据。数据集还包含1个流域及土壤水分传感器站点的*.kml文件，以及本用户指南，用于详细说明数据采集和处理方法。

NGEE Arctic项目概述
下一代生态系统实验：北极（NGEE Arctic）是一项研究计划，旨在通过建立对富碳北极生态系统及其气候反馈的预测性理解，减少地球系统模型（Earth System Models）中的不确定性。NGEE Arctic由美国能源部生物与环境研究办公室（Department of Energy’s Office of Biological and Environmental Research）资助。NGEE Arctic项目设有两个野外研究站点：1）位于阿拉斯加Utqiagvik（巴罗）附近北坡的巴罗环境观测站（Barrow Environmental Observatory, BEO）内的北极多边形苔原沿海区域；2）阿拉斯加诺姆以北苏厄德半岛不连续多年冻土区的多个区域。通过观测、实验及与现有数据集的综合分析，NGEE Arctic为多尺度建模提供了增强的知识库，并助力改进美国能源部地球系统模型（能源百亿亿次地球系统模型，Energy Exascale Earth System Model, E3SM）中全球泛北极尺度的过程表征，尤其是E3SM陆面模型组件（E3SM Land Model component, ELM）中的过程表征。