GTMIP fraction of photosynthetically active radiation (fPAR) and leaf area index (LAI) for the GRENE-TEA observation sites (level 1.0)

The modeling group (GTM) in the terrestrial ecosystem research project of the GRENE Arctic Climate Change Research Project (GRENE-TEA) aims to a) feed to the coupled global climate model (CGCM) research project for the possible improvement of the physical and ecological processes for the Arctic terrestrial modeling (excl. glaciers and ice sheets) in the extant terrestrial schemes in the CGCMs, and b) lay the foundations of the future-generation Arctic terrestrial model development. To achieve these goals GTM conducts a model intercomparison project (GTMIP) among the openly participating models. The GTMIP is designated to 1) enhance communications and understanding of the "mind and hands" between the modeling researchers and field scientists, 2) assess the uncertainty and variations stemmed from the extant model implementation/designation, and the variability due to climatic and historical conditions among the Arctic sites, and 3) feed such information and evaluations to the future-generation Arctic terrestrial model development. The GTMIP comprised of two stages: the first using observation data at the GRENE-TEA sites (stage 1) and the second using CGCM outputs for the circumpolar regions (stage 2) to drive and validate the models. The stage 1 provides monthly fPAR and LAI for the GTMIP sites, including Fairbanks (Poker Flat Research Range), Alaska, USA; Kevo (Kevo Research Station), Finland; Tiksi, Sakha Republic, Russian Federation; Yakutsk (Spasskaya Pad), Sakha Republic, Russian Federation. This data is intended to be a ready-to-feed-into-the-model set of biological data, taken and processed from the closest grid-point values of MODIS satellite data (MOD15A2, MYD15A2) at GRENE-TEA sites.GRENE北极气候变化研究项目陆地生态系统研究子课题（GRENE-TEA）下设的建模工作组（GTM），核心目标有二：其一，为耦合全球气候模型（CGCM）研究课题提供支撑，以改进当前CGCM现有陆地模式方案中北极陆地建模（不含冰川与冰盖）的物理与生态过程；其二，为下一代北极陆地模型的研发奠定基础。为达成上述目标，GTM发起了面向开放式模型参与的模型比对项目（GTMIP）。该项目旨在实现三项核心任务：1） 加强建模研究人员与野外科学家之间的“理念与实践”交流与相互理解；2） 评估现有模型在实现与设计层面带来的不确定性与差异，以及北极观测站点间因气候与历史条件引发的变量变异性；3） 将此类信息与评估结果应用于下一代北极陆地模型的研发。GTMIP包含两个研究阶段：第一阶段使用GRENE-TEA站点的观测数据（阶段1），第二阶段则采用环极区域的CGCM输出数据驱动并验证模型。阶段1为GTMIP各站点提供月度光合有效辐射吸收比（fPAR）与叶面积指数（LAI）数据，涉及的观测站点包括：美国阿拉斯加州费尔班克斯（扑克平地研究场）、芬兰凯沃（凯沃研究站）、俄罗斯联邦萨哈共和国季克西，以及俄罗斯联邦萨哈共和国雅库茨克（斯帕斯帕亚站）。本数据集旨在提供可直接用于模型输入的生物学数据集，其数据来源于GRENE-TEA各站点对应MODIS卫星数据（MOD15A2、MYD15A2）的最近格点值，并经处理得到。