Dry River Flux Data Release 2022_v1

This data release consists of flux tower measurements of the exchange of energy and mass between the surface and the atmospheric boundary-layer in semi-arid eucalypt woodland using eddy covariance techniques. It been processed using PyFluxPro (v3.3.3) as described in Isaac et al. (2017), https://doi.org/10.5194/bg-14-2903-2017. PyFluxPro takes data recorded at the flux tower and process this data to a final, gap-filled product with Net Ecosystem Exchange (NEE) partitioned into Gross Primary Productivity (GPP) and Ecosystem Respiration (ER). For more information about the processing levels, see https://github.com/OzFlux/PyFluxPro/wiki.
The site is classified as open forest savanna. The overstory is co-dominated by tree species E. tetrodonta, E. dichromophloia, C. terminalis, Sorghum intrans, S. plumosum, Themeda triandra and Chrysopogon fallax, with canopy height averaging 12.3m. Elevation of the site is close to 175m and mean annual precipitation from a nearby Bureau of Meteorology site measures 895.3mm. Maximum temperatures range from 29.1°C (in June) to 37.6°C (in July), while minimum temperatures range from 14.6°C (in July) to 24.8°C (in November). Maximum temperatures vary seasonally by 8.5°C and minimum by 10.2°C. The instrument mast is 15 meters tall. Heat, water vapour and carbon dioxide measurements are taken using the open-path eddy flux technique. Temperature, humidity, wind speed, wind direction, rainfall, incoming and reflected shortwave radiation and net radiation are measured above the canopy. Soil heat fluxes are measured and soil moisture content is gathered using time domain reflectometry. Ancillary measurements taken at the site include LAI, leaf-scale physiological properties (gas exchange, leaf isotope ratios, N and chlorophyll concentrations), vegetation optical properties and soil physical properties. Airborne based remote sensing (Lidar and hyperspectral measurements) was carried out across the transect in September 2008.

本数据集发布内容包含采用涡度协方差（eddy covariance）技术，对半干旱桉树林地地表与大气边界层间的能量与物质交换开展的通量塔观测数据。本数据集已通过PyFluxPro（v3.3.3）完成处理，处理方法参考Isaac等人（2017）的研究（https://doi.org/10.5194/bg-14-2903-2017）。PyFluxPro可将通量塔记录的原始数据处理为最终的间隙填充数据集，并将生态系统净交换（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）。如需了解更多处理层级相关信息，请参阅https://github.com/OzFlux/PyFluxPro/wiki。
该站点被归类为开阔稀树草原林（open forest savanna）。上层植被由E. tetrodonta、E. dichromophloia、C. terminalis、Sorghum intrans、S. plumosum、Themeda triandra与Chrysopogon fallax共同占优，林冠平均高度为12.3米。站点海拔接近175米，邻近的澳大利亚气象局（Bureau of Meteorology）站点观测得到的年平均降水量为895.3毫米。最高气温范围为6月的29.1°C至7月的37.6°C，最低气温范围为7月的14.6°C至11月的24.8°C。最高气温季节变幅为8.5°C，最低气温季节变幅为10.2°C。观测塔高15米。
热通量、水汽与二氧化碳通量采用开路式涡度通量技术进行观测。林冠上方部署了温度、湿度、风速、风向、降雨量、入射与反射短波辐射以及净辐射的观测传感器。土壤热通量与土壤含水率分别采用时域反射仪（time domain reflectometry）进行测量与采集。
站点的辅助观测内容包括叶面积指数（Leaf Area Index, LAI）、叶片尺度生理特性（气体交换、叶片同位素比值、全氮与叶绿素浓度）、植被光学特性以及土壤物理特性。2008年9月，沿观测样带开展了机载遥感观测，包含激光雷达（Lidar）与高光谱测量（hyperspectral measurements）。