Introduction to Deuterium Excess

Furthermore, we report a low deuterium excess near the glacier fronts, indicating below-cloud re-evaporation facilitated by the local convergence induced by the dry katabatic winds.

The deuterium excess (d-excess) of precipitation, which tracks kinetic fractionations during water phase changes, has been used to trace the regions and conditions of oceanic moisture sources, in particular from polar ice-core records.

The results show mixing between three end-members, as defined by the deuterium excess and silica concentration, led by river Rhône water which had been affected by water–rock interactions over time and mixing with surface evaporated waters.

The results indicate that the samples collected in June have higher d18O and dD values relative to the samples collected in May, and both of them have d18O and dD values plotted at the right of the meteoric line, in combination with their lower deuterium excess (d-excess) values relative to the meteoric line, implying that the water has been influenced by evaporation.

The deuterium excess did not present a clear seasonality, but higher values were found in autumn.

The variation of deuterium excess (d-excess) along the transect was stable and d-excess values in the two snow pit samples were low and similar, which indicates that the moisture source region between Zhongshan Station and LGB69 is a coastal sea area.

4 m in diameter, acted as evaporative basins with low deuterium excess (d-excess) values, from 2‰ to 4‰.

This dataset includes 287 oxygen and hydrogen (and deuterium excess) isotope data corresponding to meteoric water collected from the surface, groundwater wells, irrigation and observation wells, and water supply boreholes.

The deuterium excess (d-excess) is a function of the composition of stable isotopes, oxygen (δ18O), and deuterium (δD) in water.

Deuterium excess values plot within the region of modern precipitation and dilution of groundwater by precipitating water.

The main sources of moisture (as indicated by high deuterium excess values) were the Black (and possibly Caspian) Sea as well as the terrestrial sources in Eastern Europe and Western Asia.

Deuterium excess and stable oxygen isotopes in precipitation have been widely applied to trace the source of water vapor.

The δ 2 H and δ 18 O values of the atmospheric precipitations in the Khibins vary within the range –147 ≤ δ 2 H ≤ –37‰, –20 ≤ δ 18 О ≤ –4‰ and are close to the global line of the precipitations for the northern hemisphere; the light values (with a positive deuterium excess) are typical of snow, while the heavy values are typical of rains.

To strengthen water management and protection and understand different water exchange in the Jixi Wetland, ion composition, stable isotopes (δ18O and δ2H) and deuterium excess were studied.

To this end, in the present study 560 isotope monthly data (δ¹⁸O, δ²H, and deuterium excess) of precipitation collected in 11 sites through Tuscany from 1971 to 2018 were gathered in a database.

Isotopic composition of the ice samples (18O, 2H) and a local meteoric water line (LMWL) constructed for monthly precipitation at Postojna were used to estimate the isotopic composition of the water that formed the ice, which had high values of deuterium excess and low concentrations of chloride, sulphate and nitrate.

Deuterium excess (d-excess), as a secondary parameter of water stable isotopes, inherits the meteorological information from moisture source to the site of interest.

Additionally, the secondary evaporated water by continental recycled moisture was identified by the significantly higher deuterium excess value (16.

The factors driving variability in rainfall stable water isotopes (the ratios of H2-18O and 2HHO to H2O, expressed as δ18O, and deuterium excess, d) were studied in a 13-year dataset of daily rainf.

The deuterium excess in precipitation is an effective indicator to assess the existence of sub-cloud evaporation of raindrops.

As temperature increases, relative humidity, precipitation amount, or raindrop diameter decreases, the linear relationship between the evaporation remaining ratios of raindrops (f) and the difference of deuterium excess from cloud base to ground (Δd) weakens gradually.

The median value of the second-order isotope variable deuterium excess d, which can be used as a measure of non-equilibrium processes during phase changes, is 5.

The deuterium excess (d-excess) of rainwater in the region is found to be 10.

⑥ The deuterium excess (d-excess) in subsurface water of the plant-bed/ditch system was significantly higher than that in ditch water, and the coefficient of variation in subsurface water was considerably greater than that in ditch water.

Deuterium excess, d, the deviation from the average linear relationship between δD and δ 18O, is also commonly used to provide information about the oceanic moisture sources where polar precipitation originates.