Leaf mass area, leaf carbon and nitrogen content, Seward Peninsula and Utqiagvik (Barrow), Alaska, 2022

Leaf mass per area (LMA), and leaf carbon and nitrogen content of Arctic vegetation species from three sites in Alaska, the Barrow Environmental Observatory (BEO), in Utqiagvik, and, two sites on the Seward Peninsula, Kougarok Mile 64 and Teller Mile 27. The plants were sampled in July 2022 as part of an ongoing project to improve the understanding of stomatal conductance in the Arctic. Species sampled from the BEO (from a 1 km2 area centered around 71.275°N, 156.641°W) were Arctagrostis latifolia, Arctophila fulva, Carex aquatilis, Eriophorum angustifolium, Petasites frigidus and Salix pulchra. Alnus viridis, Salix glauca and Salix pulchra were collected at the Seward Peninsula sites. All sampled leaves were used for gas exchange measurements prior to analysis of LMA and leaf carbon and nitrogen content. The data and metadata files included in this data package are in .csv format. See related datasets for stomatal response measurements. 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).叶面积干重（Leaf mass per area, LMA），以及阿拉斯加三个站点的北极植被物种的叶片碳、氮含量：三个站点分别为位于乌特恰维克（Utqiagvik）的巴罗环境观测站（Barrow Environmental Observatory, BEO），以及苏华德半岛（Seward Peninsula）的两处站点——库加洛克64英里处（Kougarok Mile 64）与特勒27英里处（Teller Mile 27）。本次研究的植物样本采集于2022年7月，作为一项旨在加深对北极气孔导度理解的持续研究项目的一部分。于巴罗环境观测站（采样区域为以71.275°N, 156.641°W为中心的1平方千米范围）采集的物种包括：Arctagrostis latifolia、Arctophila fulva、Carex aquatilis、Eriophorum angustifolium、Petasites frigidus以及Salix pulchra。苏华德半岛的两处站点则采集了Alnus viridis、Salix glauca与Salix pulchra。所有采集的叶片在开展LMA与叶片碳、氮含量分析前，均被用于气体交换测量。本数据包包含的数据与元数据文件均采用.csv格式。有关气孔响应测量的关联数据集可参见相关资料。下一代北极生态系统实验（Next-Generation Ecosystem Experiments: Arctic, NGEE Arctic）是一项研究计划，旨在通过构建对富碳北极生态系统的预测性认知及其对气候的反馈机制，降低地球系统模型中的不确定性。该项目由美国能源部生物与环境研究办公室资助。NGEE Arctic项目设有两处野外研究站点：其一为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区域内的北极多边形苔原沿海地带；其二为阿拉斯加州诺姆以北苏华德半岛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，并助力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），尤其是其陆面模型组件（ELM）——在全球泛北极尺度下的过程表征精度得到提升。