Abstract
Water isotopes (δ2H and δ18O) were analyzed in samples collected in lakes associated to riverine systems in northeastern Germany throughout 2020. The dataset (Aichner et al., 2021) is derived from water samples collected at a) lake shores (sampled in March and July 2020); b) buoys which were temporarily installed in deep parts of the lake (sampled monthly from March to October 2020); c) multiple spatially distributed spots in four selected lakes (sampled in September 2020); d) the outflow of Müggelsee (sampled biweekly from March 2020 to January 2021). At shores, water was sampled with a pipette from 40–60 cm below water surface and directly transferred into a measurement vial, while at deeper parts of the lake a Limnos water sampler was used to obtain samples from 1 m below surface. Isotope analysis was conducted at IGB Berlin, using a Picarro L2130-i cavity ring-down spectrometer. The data give information about the seasonal isotope amplitude in the sampled lakes and about spatial isotope patterns in different branches of the associated riverine systems.
Highlights
We provide a comprehensive dataset of water isotopes in lakes along the river-lake system of the northeastern German lowland area (Aichner et al, 2021), which covers the major riverine systems and evaluates the seasonal variability on selected spots, i.e. in lakes which are part of different riverine
Water samples were taken with a pipette and directly transferred in a gas chromatography (GC)-vial, which was closed instantly after sampling and stored cold (6°C) until further processing
The monthly sampled lakes, showed variable seasonal amplitudes, ranging from δ2H 2–13 ‰ and δ18O 0.4– 2.6. 150 A seasonal isotopic signal has been observed in many riverine and lacustrine systems (e.g. Dutton et al, 2005; Ogrinc et al, 2011; Halder et al, 2015; Reckerth et al, 2017)
Summary
30 The varying physical properties of stable oxygen and hydrogen isotopes of the water molecule (16O, 17O, 18O, 1H, 2H) result in isotope fractionation during evaporation and condensation processes. This causes spatial and temporal variability of the isotopic signature of water in both the liquid and the vapor phase (Craig, 1961; Dansgaard, 1964; Gat and Gonfiantini, 1981). 40 The northeastern part of Germany is characterized by a complex system of rivers and lakes The connectivity of those lakes is an important influence on how ecological and chemical water properties are propagated along the river-lake network. We provide a comprehensive dataset of water isotopes in lakes along the river-lake system of the northeastern German lowland area (Aichner et al, 2021), which covers the major riverine systems and evaluates the seasonal variability on selected spots, i.e. in lakes which are part of different riverine
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