Arcturus Emerald Flux Data Release 2024_v1

This release consists of flux tower measurements of the exchange of energy and mass between the surface and the atmospheric boundary-layer using eddy covariance techniques. Data were processed using PyFluxPro (v3.4.17) as described by Isaac et al. (2017). PyFluxPro produces a final, gap-filled product with Net Ecosystem Exchange (NEE) partitioned into Gross Primary Productivity (GPP) and Ecosystem Respiration (ER).

The Arcturus greenhouse gas (GHG) monitoring station was established in July 2010, 48 km southeast of Emerald, Queensland. Flux tower measurements were carried out from June 2011 to early 2014. The station was part of a collaborative project between Geoscience Australia (GA) and CSIRO Marine and Atmospheric Research (CMAR). The elevation of the site is approximately 170 m asl and mean annual precipitation is 572 mm. The tower bordered 2 land use types to the west lightly forested tussock grasslands; to the east crop lands, cycling through fallow periods. The instruments were installed on a square lattice tower with an adjustable pulley lever system to raise and lower the instrument arm. The tower was 5.6 m tall with the instrument mast extending a further 1.1 m above, totalling a height of 6.7 m. Fluxes of heat, water vapour, methane and carbon dioxide were measured using the open-path eddy flux technique. Supplementary measurements above the canopy included temperature, humidity, windspeed, wind direction, rainfall, and the four components of net radiation. Soil heat flux, soil moisture and soil temperature measurements were also collected.

本次发布的数据集包含采用涡度协方差（eddy covariance）技术获取的地表与大气边界层间能量与物质交换通量塔观测数据。数据处理采用PyFluxPro（v3.4.17）工具，处理流程遵循Isaac等人（2017年）的研究方法。PyFluxPro可生成经过间隙填充的最终数据集，将生态系统净交换（Net Ecosystem Exchange, NEE）划分为总初级生产力（Gross Primary Productivity, GPP）与生态系统呼吸（Ecosystem Respiration, ER）。
阿耳库鲁斯（Arcturus）温室气体（Greenhouse Gas, GHG）监测站于2010年7月设立在昆士兰州埃默拉尔德东南48公里处。通量塔观测工作于2011年6月至2014年初开展。该站点隶属于澳大利亚地质调查局（Geoscience Australia, GA）与澳大利亚联邦科学与工业研究组织海洋与大气研究部（CSIRO Marine and Atmospheric Research, CMAR）的合作项目。该站点海拔约170米，年平均降水量为572毫米。观测塔周边存在两种土地利用类型：西侧为带有轻度林分的簇生草丛草原，东侧为轮作休耕的农田。观测仪器安装在方形格构塔上，配有可调节滑轮杠杆系统以升降仪器臂。塔体本身高度为5.6米，仪器桅杆在此基础上再延伸1.1米，总高度达6.7米。研究采用开放式涡度通量技术测量热量、水汽、甲烷与二氧化碳的通量。冠层上方的补充观测项目包括气温、湿度、风速、风向、降雨量以及净辐射的四个分量。同时还采集了土壤热通量、土壤含水量与土壤温度的观测数据。