The FLUXNET2015 dataset provides ecosystem-scale data on CO 2 , water, and energy exchange between the biosphere and the atmosphere, and other meteorological and biological measurements, from 212 sites around the globe (over 1500 site-years, up to and including year 2014). These sites, independently managed and operated, voluntarily contributed their data to create global datasets. Data were quality controlled and processed using uniform methods, to improve consistency and intercomparability across sites. The dataset is already being used in a number of applications, including ecophysiology studies, remote sensing studies, and development of ecosystem and Earth system models. FLUXNET2015 includes derived-data products, such as gap-filled time series, ecosystem respiration and photosynthetic uptake estimates, estimation of uncertainties, and metadata about the measurements, presented for the first time in this paper. In addition, 206 of these sites are for the first time distributed under a Creative Commons (CC-BY 4.0) license. This paper details this enhanced dataset and the processing methods, now made available as open-source codes, making the dataset more accessible, transparent, and reproducible.

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This study focuses on changes in irradiance, temperature, precipitation, evaporation, snow cover, and water balance in Saxony (eastern Germany) over the past 50 yr. It had 2 main objectives: (1) collection of all available climatological data with daily resolution, (2) statistical analysis of the climate. Time series of more than 600 meteorological stations from Saxony and the surrounding regions have been organized in the Saxon climate databank. This databank contains tools for homogeneity tests and trend analysis of climatologic time series. This makes it possible to calculate derived and complex quantities from single climate elements. About half of the time series tested were sufficiently homogeneous for a regional climate analysis of Saxony. The most important results of the trend analysis are: (1) marked decrease in summer rainfall (-10 to -30%); (2) significant increase in winter precipitation; (3) increase in heavy rainfall events during early summer; (4) increase in the length and frequency of dry periods in both vegetation periods; (5) increase in temperature in all seasons, and especially in winter (> 2°C in northern Saxony); (6) increase in irradiance and potential evaporation by about 7% in the last 30 years.

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