Intensive Site 1 Vegetation Plot Photos, Barrow, Alaska, 2012

Photographs were taken on 24th June, 15th July and 17th August 2012, using a Canon Ixus 70 7.1 megapixel digital camera. Photographs were taken during the recording of weekly soil moisture, temperature and thaw depth measurements (Sloan et al., 2014), over a time period spanning approximately 6 hours on each day. Photographs were taken from positions where matted trail allowed access to vegetation plots. This dataset contains 14 files. Twelve of the files are zipped folders containing photos of specific plots during one of three days. 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).

本数据集的拍摄工作于2012年6月24日、7月15日及8月17日开展，采用佳能Ixus 70型7.1百万像素数码相机完成。拍摄同步配合每周土壤湿度、温度及解冻深度测量作业进行（Sloan等，2014），单日拍摄时长约为6小时。拍摄点位均设于植被样地可通行的踩踏步道区域。本数据集共计包含14个文件，其中12个为压缩文件夹，分别对应三日中某一日的特定植被样地拍摄照片。下一代北极生态系统实验（Next-Generation Ecosystem Experiments: Arctic，简称NGEE Arctic）是一项科研项目，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，降低地球系统模式（Earth System Models）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项目设有两处野外科研站点：其一坐落于美国阿拉斯加州乌特恰维克（原称巴罗）附近北坡的巴罗环境观测站（Barrow Environmental Observatory，简称BEO）范围内的北极多边形苔原沿海区域；其二位于阿拉斯加州诺姆以北的苏华德半岛不连续多年冻土区的多处地块。通过实地观测、受控实验以及与现有数据集的整合分析，NGEE Arctic项目为多尺度建模构建了更为完善的知识库，并助力美国能源部地球系统模式（即能源级超算地球系统模型Energy Exascale Earth System Model，简称E3SM），尤其是其陆面模式模块（E3SM Land Model Component，简称ELM），在全球泛北极尺度上实现了过程表征的优化。