Dry River Flux Data Release 2024_v2

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 site is classified as open forest savanna. The overstory is co-dominated by tree species Eucalyptus tetrodonta, Eucalyptus dichromophloia, Corymbia terminalis, Sorghum intrans, Sorghum plumosum, Themeda triandra and Chrysopogon fallax, with canopy height averaging 12.3 m. Elevation of the site is close to 175 m and mean annual precipitation from a nearby Bureau of Meteorology site measures 895.3 mm. 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 m 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, nitrogen and chlorophyll concentrations), vegetation optical properties and soil physical properties. Airborne based remote sensing (Lidar and hyperspectral measurements) was carried out across the site in September 2008.

本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和物质交换通量塔观测数据。数据处理采用PyFluxPro（v3.4.17）完成，处理流程遵循Isaac等人（2017年）的研究方法。PyFluxPro可生成经间隙填充的最终数据集，将生态系统净交换量（Net Ecosystem Exchange, NEE）划分为总初级生产力（Gross Primary Productivity, GPP）与生态系统呼吸量（Ecosystem Respiration, ER）。
该站点被归类为开阔森林稀树草原。林冠层优势种为细叶桉（Eucalyptus tetrodonta）、二色桉（Eucalyptus dichromophloia）、顶托伞房桉（Corymbia terminalis）、高粱（Sorghum intrans）、羽毛高粱（Sorghum plumosum）、黄背草（Themeda triandra）以及福来克金须茅（Chrysopogon fallax），林冠平均高度为12.3米。站点海拔约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。最高气温的季节范围为29.1℃（6月）至37.6℃（7月），最低气温的季节范围为14.6℃（7月）至24.8℃（11月）；最高气温的季节波动幅度为8.5℃，最低气温的季节波动幅度为10.2℃。观测塔架高度为15米。采用开路式涡度通量技术开展热通量、水汽通量与二氧化碳通量观测。林冠上方同步观测气温、空气湿度、风速、风向、降雨量、入射与反射短波辐射以及净辐射。采用时域反射仪（time domain reflectometry, TDR）测定土壤热通量与土壤含水量。该站点的辅助观测项目还包括叶面积指数（Leaf Area Index, LAI）、叶片尺度生理特性（气体交换、叶片同位素比值、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，研究团队在该站点全域开展了机载遥感观测，包含激光雷达（Lidar）与高光谱测量。