AmeriFlux Gap-Filled Data from Selected Sites

AmeriFlux [http://ameriflux.lbl.gov/] is part of the larger network Fluxnet [http://daac.ornl.gov/FLUXNET/fluxnet.shtml] which endeavors to connect observations from regional micrometeorological tower sites for global analysis. AmeriFlux towers measure the exchange of energy, water, and carbon through a network of sites with variable vegetation, disturbance records, and climatic conditions. The ecosystems included within the network are temperate and tropical evergreen forests, temperate deciduous forests, woodlands, grasslands, agricultural crops, boreal, and shrublands. Climates in these biomes vary between tundra, temperate, tropical, and arid.

This Level 4 Dataset accumulated from the AmeriFlux Network focuses on hourly, daily, and monthly observations collected at North American tower sites. The selection of AmeriFlux sites were chosen based on the period of available data, the diversity in vegetation types, the past success of testing land surface models, and the availability of atmospheric forcing for Community Land Models. AmeriFlux Level 4 data has been gap-filled, quality-flagged and includes meteorological variables, CO2 exchange rates, heat fluxes, biogeochemical pools, calculated gross productivity, and ecosystem respiration terms. The period of record varies by individual tower site, but some sites have as much as 15 years of recorded data.

AmeriFlux [http://ameriflux.lbl.gov/] 作为更大规模的 Fluxnet [http://daac.ornl.gov/FLUXNET/fluxnet.shtml] 网络的一部分，致力于连接区域微气象观测塔站点的观测数据，以实现全球分析。AmeriFlux 观测塔通过具有不同植被类型、干扰记录和气候条件的站点网络，测量能量、水和碳的交换。该网络中包含的生态系统包括温带和热带常绿森林、温带落叶森林、林地、草原、农业作物、北方针叶林和灌木丛。这些生物群落中的气候类型介于苔原、温带、热带和干旱之间。本 Level 4 数据集由 AmeriFlux 网络累积而来，专注于北美塔站点收集的每小时、每日和月度观测数据。选取 AmeriFlux 站点的依据包括可获取数据的时期、植被类型的多样性、过去测试地表模型的成功记录以及为社区地表模型提供的气象强迫数据。AmeriFlux Level 4 数据经过插补、质量标记，并包含气象变量、CO2 交换率、热通量、生物地球化学库、计算的总生产力以及生态系统呼吸项。记录时期因个别塔站点而异，但某些站点拥有长达 15 年的记录数据。