Canopy spectral reflectance along the NGEE-Arctic tram transect, Utqiagvik (Barrow), Alaska, 2015-2017

Full-spectrum (350-2500 nm) canopy spectral reflectance measured in July 2015, 2016 and 2017 along the NGEE-Arctic tram located on the Barrow Environmental Observatory (BEO), Barrow, Alaska. Measurements were made using a SVC HR1024i spectroradiometer mounted on a manually operated instrument cart. Spectra were collected at 137 stop points at 0.5 m intervals along the tram transect, with each measurement calibrated to variable illumination conditions using a Spectralon white plate. Data were collected in July, 2015-2016, and in June, July and September in 2017. Processed spectral data are presented in .csv and .xlsx files for each year and the complete SVC instrument output (.sig) are also included in .zip files. The data package includes some photographs showing the tram transect and spectroradiometer setup and a written protocol with details of equipment used and methods. 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).本数据集为2015、2016及2017年7月，在阿拉斯加巴罗的巴罗环境观测站（Barrow Environmental Observatory, BEO）沿NGEE-Arctic步道采集的全光谱（350~2500 nm）冠层光谱反射率数据。数据采集采用安装于手动操作仪器小车上的SVC HR1024i光谱辐射计（spectroradiometer）。沿步道样带以0.5米间隔设置137个测点采集光谱，每次测量均使用Spectralon白板进行校准，以适配可变光照条件。数据采集时段为2015-2016年的7月，以及2017年的6月、7月与9月。经处理的光谱数据按年份分别保存为.csv与.xlsx格式文件，完整的SVC仪器原始输出（.sig格式）也一并打包至.zip压缩文件中。本数据包还包含展示步道样带与光谱辐射计布设场景的照片，以及一份详细说明所用设备与实验方法的书面规程。下一代生态系统实验-北极（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的预测性理解及其气候反馈机制，降低地球系统模型不确定性的研究项目。该项目由美国能源部生物与环境研究办公室资助。NGEE Arctic设有两个野外研究站点：1）位于阿拉斯加乌特恰维克（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）阿拉斯加诺姆以北苏华德半岛不连续永久冻土区的多个片区。通过观测、实验与现有数据集的综合分析，NGEE Arctic为多尺度建模提供了更完善的知识库，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陆面模型，ELM）——在全球泛北极尺度上的过程表征精度提升。